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Carter Thermoquad Information Guide

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1. 81 699 2009 Chrysler Student Reference Book Quadrajet Carburetor 1984 81 699 5003 Chrysler factory service manuals various 1971 1984 Chrysler parts catalogs various 19711 1984 Chrysler Technical Service Bulletin 14 01 72C Dec 15 1971 Direct Connection amp Mopar Performance catalogs Mopar Performance Engine Manual P52249010 8th Edition Hot Rod magazine June 1970 Car Craft magazine March 1972 The Hot Rodders Manual for Street amp Strip 79 80 amp 81 82 Annual Hot Cars Popular Hot Prodding October 1973 October 1981 High Performance Mopar magazine Summer 1988 Mopar Action magazine February 1991 October 1991 Mopar Muscle magazine August September 1995 Chrysler Power magazine January March May 1988 KEM Air amp Fuel Management Systems Parts AF 114 1993 KEM All Line Buyers Guide BG 116 1995 Hygrade Carburetor Kit amp Component Parts Guide FC 91 1991 Hygrade Carburetor amp Fuel System Parts Guide CM 88 1988 Hygrade Carburetion Component Guide FT 91 1991 Holley Replacement Carburetors catalog L 30033 4 Spring 1985 Borg Warner Carburetor Kits catalog CK 79 Sept 1979 Motorcraft Carburetor Emission Parts amp Tune up Kits F200W 1985 AC Delco Carburetors amp TBI Carb Kits amp Parts 100 1986 Tomco Remanufactured Carburetors amp catalog D I 1991 1991 Kimco Carburetors 30 9 3 1 83 Kimco Carburetor Numerical Listing amp OEM S
2. 7 902 309 3621225 CT 1062 15554A 902 318A is for the 9000 series Hygrade 657C is known to work in a 9811 CT 1062 is the Motorcraft number for the Ford application Carter Strip Kit Carter 10 104 Strip Kit Competition Series Carter 10 105 Strip Kit Competition Series SA Carter 10 110 Strip Kit 71 and Competition Series Carter 10 203 Strip Kit 72 up see Strip Kit section for early versions Floats Carter 21 252 nitrophyl 21 249 brass Chrysler 3780155 THC 501288 Ford D4AZ 9550 B CM2028 KEM F104 brass Borg Warner CF252B brass CF252 nitrophyl Echlin Fuel Systems 2 483 brass 2 427 nitrophyl FILKO 19 105 brass Motorcraft CM 4384 brass Hygrade FL4 nitrophyl Chokes Note Most of the Chrysler TQ chokes were of the same basic design In 1973 electric assist was added Following is a summary of most of the chokes with model applications Various versions were available due to operating environments and emissions The listing is per Carter choke numbers from their catalog Some manufacturer cross indexing differs Chrysler and Hygrade listed for reference Carter 170 148 Chrysler 3512875 4972 4973 6138 6139 6144 Carter 170 245 6090 6140 6165 6166 Carter 170 1371 Chrysler 4287004 Hygrade CV400 non electric assist 9379 Canada Carter 170 1408 Chrysler 3698355 3751484 4027715 4027793 4095328 Hygrade 164 6318
3. 9124 78 318 Truck CA 4095428 4092 5110 1997 1 3 8 3 9125 78 360 Truck MT CA 4095429 4092 5110 1938 1 3 8 3 9126 78 360 Truck AT CA 4095430 4092 5110 1938 1 3 88 9127 77440 AT 4098 5125 2179 1 120 19128 179 80 345 AT IHC LE 1 3 8 4 9134 78 360 AT FHA CA IE 4041856 14092 5110 1996 1 3 83 9136 178 360 Mexico 9137 78318 AT Can Exp 4041858 4092 5110 1998 1 3 88 9140 78 400 AT F 4041861 4092 5137 1997 1 1 2 3 9147 78 318 AT CA 4041865 4092 5110 1996 1 3 8 3 9148 78440 AT CA IE 9149 178 440 Truck MD 4095440 1 23 9150 78 440 Truck HD 4095441 4099 5125 2110 1 1 28 9151 78 440 Truck HD 4095442 4098 5125 1998 1 1 2 3 9152 178318 Truck AT LD Can 4092 5110 1997 1 3 8 3 9153 78 440 HP AT CA 4041874 9161 78 440 Can Exp 4041879 haa 9172 179 360 Truck LD MD IE e F 9173 78 79 360 Truck HD BV Fr 9180 178440 AT F 4041881 E haa 9182 78 400 AT F 4041882 L FF heb 9183 78 79 318 Truck BV Fk F asp 19185 78 79 318 Truck BV FF kk has 9187 78 79 318 Truck BV Fr Fk Hh 9188 78400 AT Can Exp 4041892 Fr FF 9190 178 440 Truck MD AT kk haa 9193 78 79 360 Truck HD BV Fr FE has 9194 78 79 360 Truck HD BV Fr Fk 88 9195 79318 AT CA IE BV 4095934 Fr FF 9196 79360 AT F IE BV
4. CS and 71 TQs have the primary jets in the upper bowl cover All other TQs have screw in primary jets in the main body All TQs have the secondary jets mounted in the upper bowl cover jets have a part number prefix of 120 72 and later TQs usually have the part suffix stamped on the jet primaries 4X XX secondaries 5X XX or 120 5 The XXX denotes the size example 4098 0 098 5137 0 137 CS and 71 TQs have part number suffixes of 3XX or 3XXX Metering rods and step up Floats metering rods meter the fuel through the primary jets They are essentially controlled by engine vacuum and a mechanical link step up cam lever connected to the primary throttle shaft Many variations of metering rods were available through the years The depth of pre 76 models could be adjusted to tune primarily cruising condition flow via a screw adjustment Some later models retained this feature but starting in 1980 may have the adjustment locked a collar Metering rods have three steps for metering economy midrange power They are usually stamped with a part number 75 XXXX or XXXX where the XXXX defines the step sizes The CS and 71 TQs have numbers 16 XXX TQs a single fed dual inlet dual bowl carburetor One bowl feeds each carb half ie one primary and one secondary The dual bowl arrangement is contained in the phenolic main body Dual floats and dual inlet valves are employed Early used brass floats Late
5. For 71 OEM TQ only 75 1937 070 046 040 75 1938 071 051 40 75 1939 070 058 040 75 1940 072 060 045 5 1962 067 055 045 5 1965 069 061 045 75 1966 067 052 045 175 1994 068 043 035 5 1995 066 040 085 5 1996 069 048 035 067 045 035 070 057 040 5 1999 068 1 054 040 5 2000 066 054 035 064 051 035 T T iid n o EE l 2 1052 049 058 1055 1054 061 1061 1053 061 061 1062 066 1064 Primary Jet Info dimensions in inches 120 3XXX is for 71 OEM and CS with screw in jets 120 3 is for CS with press in jets 120 4XXX is for 72 and later solid fuel OEM amp 9000 series Jet Size 120 330 077 120 331 080 120 332 083 120 333 086 120 334 089 120 335 092 120 3074 074 120 3077 077 120 3080 080 120 3083 083 120 3086 086 120 3089 089 120 3092 092 120 4092 092 120 4095 095 120 4097 097 120 4098 098 120 4099 099 120 4100 100 120 4101 101 120 4104 104 denotes part of 10 203 Strip kit Secondary Jet Info dimensions inches 120 3XXX is for 71 OEM and CS with screw in jets 120 3XX is
6. Mounts on the front of the bowl cover where the IE module mounted earlier This solenoid is used to control the air fuel mixture via varying duty cycle pulsing from the control computer based on feedback from exhaust engine and ambient sensors Fuel bowl inserts Some later models had an insert in the fuel bowls to reduce the bowl fuel volume Choke pull off cover Many 81 84 models have a cover to prevent field adjustment of the pull off Port Diagram This section contains a diagram and notes to identify the various hose port connections on the Thermo Quad Different port configurations were used throughout the years The diagram is a representation of the throttle base top view It is drawn with all possible ports The label notes identify the ports and their general usage Some ports are contained in the bowl or bowl cover These are also identified The ports are labeled by x descriptions follow the diagram FRONT B m E Ws 1 D E G E N f DX O H J K L mmu Iho edi 2 y A Distributor Vacuum Ad
7. Once it is obvious that the air door is opening too soon due to spring under tension the object of the adjustment process will be to increase spring tension gradually until the symptoms just removed This way the secondaries will begin flowing air at the soonest possible opportunity but not an instant too soon thus maximizing acceleration So starting from a situation where the air door spring is clearly under tensioned wind the shaft in 1 4 Counter clockwise turn increments test driving the car in between adjustments As soon as the acceleration when the accelerator pedal is floored becomes smooth and forceful without any bogging or hesitation stop don t make any further adjustments Note In practice it is difficult to make a ThermoQuad transition totally smoothly to full throttle Due to the extremely large size of the secondary throats relative to the primary throats opening the secondary throats will always result in a dramatic slowing of airflow through the carburetor resulting in at least a minor hesitation Air door adjustment is thus a matter of trial and error starting from the base setting described above first try reducing the tension on the air door spring if this makes the hesitation worse try increasing the tension on the spring Only add a 1 4 turn to the adjuster each time Eventually you will find the position which results in the smoothest transition to full throttle for your case but it still may no
8. 1 1 2 2 9050 175 400 AT Can IE 3830561 4099 5143 1965 1 1 2 1 3 9051 75 440 AT Can IE 3839562 4095 5125 2144 1 120 9052 75 76 440 HP Can IE 3830568 4095 5137 2024 1 1 2 2 9053 75 400 AT CA IE PDC SW 3830570 0054 75 76 400 HP AT F IE 3830569 055 76 360 AT CA IE 4006624 056 75 400 SW AT CA IE 9057 76 400 AT Can IE 41 P G2 ON T N N ESEJ Q oo 4 N T N N NIS ND ND ON ital m T N N 9058 76440 AT F IE 4006631 5137 2109 1 1 2 2 9059 76440 AT CA IE 4006632 5137 2145 1 1 2 2 9062 176440 HP AT CA IE 5137 2153 1 1 2 2 9063 75 440 AT CA early 4099 5143 1965 1 1 2 2 9064 76 400 AT LB 4099 5143 1965 1 120 9065 75 76 922 4098 5137 2109 1 1 2 2 9066 76440 HP AT F IE 4099 5137 2103 1 1 20 9068 175 400 AT CA late 4099 5143 2145 1 1 2 2 9069 175440 AT CA late 4099 5143 2145 1 1 2 2 9072 15 360 AT CA late 4099 5143 1965 1 1 2 2 9073 175440 AT CA late 4098 5137 2145 1 1 2 2 9074 16 400 AT CA 4006642 4099 5143 2145 1 120 9076 77 360 HP IE 4027735 4092 5137 1938 1 3 8 2 9077 77 400 4027736 4098 5143 2159 1 1 2 2 4 Q oo
9. 4095935 4095 5110 2210 1 3 8 3 9197 179360 AT Can IE BV 4095936 Jnr388 9198 79 360 HP AT CA IE BV 4095937 1 83 9202 79 360 AT CA IE 4095939 Fr Fk 9203 79 80 345 IHC 1700004C91 4095551102144 1 3 84 9205 79 80 345 AT IHC F 1 4 9207 79 360 Truck HD Fr 88 9208 78 79 360 Truck HD BV 9209 79 360 Truck HD Fr F 9210 78 79 360 Truck HD BV L EF F qnas 9211 79440 Truck HD 9212 79440 Truck HD Ft 28 9213 178 440 Truck HD Ft FE haa 9214 178 79 440 Truck BV Fk F ha 9215 78 79 Truck 9216 78 79 318 Truck BV Fr F sl 9217 78 79 360 Truck HD BV E 1 3 8 3 9218 78 79 360 Truck HD BV 13 88 9219 78 83 Truck 13 88 9221 78 440 Truck HD 1 1 23 9223 78 79 318 Truck BV 1 3 8 3 9224 79360 Truck LD MD BV IE 13 88 9225 79360 Truck LD MD BV IE 13 88 9226 79360 Truck LD MD IE F LE 9227 178 79 318 Truck BV 13 88 9228 78 79 318 Truck BV 13 88 9229 78 79 318 Truck BV k 13 88 9230 80318 AT Can Exp BV 4179033 1 3 8 3 9232 80318 AT Can BV 4179035 E 1 3 8 3 9234 80318 AT F BV 4179037 Lr 13 88 9236 80 360 AT Can 4179039 13 88 9238 179 81 Mexico E lr 11 3 8 3 9240 79446 Motor Home I
10. Carb Type and Models Covered with contents 4972 4973 71 340 10 primaries 074 077 080 083 110 secondaries 119 122 125 128 131 needle seats 0935 111 rods 655 682 683 TQ 6138 6139 9002 9011 10 primaries 092 095 098 101 104 secondaries 131 143 149 needle seats 0935 111 rods 1998 1999 TQ 6140 6615 9034 10 primaries 092 095 098 101 104 112 secondaries 131 143 149 needle seats 0935 111 rods 2000 2001 6090 primaries 092 095 098 101 104 a e secondaries 131 143 149 e needle seats 0935 111 e rods 1995 2005 6165 6166 9800 10 primaries 092 095 098 101 104 114 secondaries 131 143 149 needle seats 0935 111 rods 1996 1997 10 115 10 116 6318 6319 6321 6322 6324 6339 3640 6342 6410 6411 6452 6454 6456 6457 6459 6460 6488 6616 9013 9016 9017 9022 9023 9025 primaries 092 095 098 101 104 secondaries 131 143 149 needle seats 0935 111 rods 2002 TQ 6320 6341 6453 6455 6461 6496 9004 9008 9009 9012 9014 9015 9024 9046 9049 9050 9051 9052 9053 9054 9063 9072 primaries 092 095 098 101 104 secondaries 131 143 149 needle seats 0935 111 rods 2003 2004 Later Kits and 9000 Kit Carb Type and Models Covered with contents 10 20
11. Many sizes were available See the Service Parts section for sizing information Many later model TQs were lean on the primary side Increasing primary jet size and or reducing metering rod size will richen the primary side Secondary jets can be changed as well If replacement units are not available jets may be drilled to increase size Rods may be filed to reduce size Solder and drilling filing can be used to reverse this to some extent Floats Early TQs had brass floats By 1975 all TQs used nitrophyl floats Over time the nitrophyl floats can absorb gas and sink allowing fuel levels to be too high The floats should weigh 7 4 8 0 grams Carter no longer services brass floats but several sources are available see the Service Parts Information section Accelerator pump clusters squirters The accelerator pump clusters were available in various sizes Drilling may be used to increase the orifices to tune pump fuel delivery Mixture screws The screws are readily accessible on 71 79 TQs Some of these had plastic caps to limit travel The caps can be removed Some 77 79 contained internal restrictors to mixture adjustment These restrictions are in the base mixture path from the idle circuits and could be opened if needed Note mixture screws prior to 1976 had a 20 degree taper at the seat and cannot be interchanged with 77 and later 12 degree screws 1980 and later TQs may have hidden screws The base enclosed the screws in cast protru
12. actually main body visible as the dark center section in the above photographs The main body contains the fuel reservoir and the plastic construction is claimed to keep the fuel cooler than a metal body would thus enabling more accurate fuel metering The primary fuel metering system features mechanical and vacuum controlled metering rods which eliminate the need for a power valve circuit within the carburetor Opening the throttle mechanically raises the metering rods proportionally thus richening the mixture according to throttle position Rod position and hence mixture richness is further controlled by engine vacuum resulting in a fuel mixture that is always tailored to instantaneous engine load The carburetor is fully tunable External idle mixture screws enable precise adjustment of the idle mixture The primary circuit metering rods are adjustable and replaceable without disassembly of the carb The primary metering circuit also includes replaceable jets and replaceable metering rod step up springs Variation of step up spring strength and preload enables adjustment of the rate at which the mixture richens in relation to engine vacuum and hence load The secondary metering circuit features replaceable jets It is also possible to adjust the rate at which the secondary air door opens enabling activation of the secondary throats at higher or lower engine loads depending on the needs of a particular engine The automatic choke mecha
13. adjustment and lock screw arrangement similar to the AVS Choke OEM TQs use a divorced manifold mounted choke Exhaust crossover heat operates the thermostatic spring contained in the choke well Most 73 84 TQs were electrically assist heated The electric control is via a small module mounted to the intake or right head This unit times the assist based on temperature and time and receives power from the ignition run circuit 9000 series have an integral choke assembly identified by the black circular plastic thermostat housing This unit is electrically controlled CS units have a manual choke Choke action is accomplished via the choke plate in the top of the primary side Mixture screws Screws used through 11976 had a 20 degree taper at the seat In 1977 this was changed to 12 degrees to reduce adjustment sensitivity Some 77 79 TQs also contained internal restrictors to limit adjustment Plastic caps with tabs to limit adjustment were also installed on several models Many 1980 and later TQs had the base redesigned to enclose the mixture screws so they could be capped via plugs after factory setting Choke pull off On all TQ models This performs the vacuum kick pull off function for the choke at initial cold engine start It is also used to regulate and dampen secondary air valve opening Mounted on the right rear base under a mounting bolt and screw Connects to the rear vacuum port right color code gold The CS has the diaphragm f
14. and ESA TQs Many Lean Burn carburetors lack a vacuum advance port because the ELB computer controlled advance The port may be added to provide a vacuum advance signal for a conventional non ELB ESA distributor system The vacuum advance port is somewhat tricky and is best performed by comparison to an earlier throttle base that has the factory port Using 5 32 drill bit drill the throttle base where the vacuum port existed on previous units drill into the open roughly square opening between the outside and the throttle bore This will accommodate the vacuum fitting Then using 1 16 drill bit drill two holes just above the throttle plate into the same square opening from the throttle bore side one hole adjacent to the other parallel to the throttle plate Then using a knife or small screwdriver blend the holes together into a slot This serves as the off idle transfer slot to feed the vacuum port Press a short length of 5 32 pipe or an old fitting into the outside hole Vacuum advance is now available Using another base with the port as a guide will ensure proper placement of the transfer slot Misplacing the vacuum idle transfer slot can cause an off idle stumble and will necessitate additional tuning or replacement Tamper proof choke pull off TQs with this feature have a pull off with the enclosure attached These can be replaced with an earlier standard pull off to allow choke tuning Fuel bowl inserts These may be removed to a
15. by rotating the shaft CLOCKWISE When the desired tension is achieved tightening the lock in a clockwise direction locks the shaft Being spring loaded of course the shaft will attempt to spin itself fully clockwise whenever the lock is released It is therefore necessary to hold the shaft in its current position whenever the lock is released or in the process of being locked or released It s easiest to make these adjustments by using a screwdriver on the shaft and the factory tool or a copy of it to release and tighten the lock whilst the screwdriver holds the shaft in place It s difficult but not impossible to just use two screwdrivers SPRING BASE SETTING Because the shaft will invariably slip out of your grip and spin down to the loosest position a base setting for the spring tension is achieved as follows Loosen the lock and allow the shaft to spin out the air door will flop fully open Wind the shaft in an COUNTER CLOCKWISE position until the air door GENTLY closes Wind the shaft an additional 1 5 turns counter clockwise Hold it in this position and tighten the lock FURTHER SPRING ADJUSTMENT It s easiest to adjust the spring from an under tensioned starting point If you feel on the basis of symptoms described above that the spring is over tensioned reduce the tension by winding the shaft CLOCKWISE until symptoms of under tension ie mixture leaning out become evident when flooring the accelerator pedal whilst driving
16. effort is not worth the result The solenoid bowl vent system can be retained by wiring into the ignition run circuit if adding to an earlier vehicle If the ECS canister is not used the port can be vented to the atmosphere like 70 and earlier carburetors were done A protective screen over the port can be used Oxygen Feedback Pulsing Solenoid O2 Most 1980 and later TQs will contain an oxygen feedback controlled pulsed solenoid in place of an IE module The solenoid is variably pulsed by the control computer based on the signal it receives from the exhaust mounted sensor The solenoid alters the variable air bleeds by inputting more or less air based on computer signal duty cycle If the solenoid is disconnected the air bleeds will allow a full rich condition Tuning with this in mind this TQ could potentially be used in a non control feedback vehicle Idle Stop Solenoid ISS The idle stop is external to the TQ and is used to prevent engine run on It can be retained disconnected or reused for other functions such as compensating for engine loading ie air conditioning like a SIS unit Solenoid Idle Stop SIS The idle stop is external to the TQ and is used to compensate for engine loading ie air conditioning It can be removed if not needed Throttle Position Solenoid TPS The solenoid is external to the TQ and is used for catalytic converter protection It can be removed if not needed Vacuum Throttle Positioner VTP The pos
17. enables a smooth transition to wide open throttle in the following manner because of the spring loading of this door it will be sucked open a short time after the secondary throttle plates are open the secondary discharge tubes visibly as two long tubes protruding into the upper sections of the secondary throats are located above the secondary throttle plates but below the air door thus are exposed to full manifold vacuum in the time between the throttle plates opening and the air door opening this ensures fuel flow through the secondary jets will be provoked by the vacuum effect just before the air door opens and air starts to flow through the secondaries In circumstances where manifold vacuum is too low to begin drawing fuel through the secondary jets eg full throttle at low engine speed the air door will not open either preventing any flow through the secondary throats and preventing the engine bogging down through over carburetion In practice there are two ways in which the air door can be out of adjustment The air door spring can be under tensioned allowing the door to open before fuel flow has started in the secondary jets or it can be over tensioned preventing the door from opening until sometime after fuel flow has started in the secondary jets The first situation will result in a period of too lean mixture the second will result in a period of too rich mixture Both cases will cause a bog or stumble in the engine as the s
18. engine demands The primary circuit mixture can be varied first by adjusting the base position of the metering rods A higher position where the rods are further out of the jets will result in a richer mixture across their operating range and conversely a lower position will reduce the fuel flow through the jets across the range resulting in an overall leaner mixture Secondly the rods can be exchanged for different rods without disassembling the carb such as rods with a different profile or diameter allowing the mixture curve to be widely varied to suit the needs of a specific engine Lastly the fixed jets themselves can be changed for jets with a different flow rate removing the top of the carb is required to change these jets resulting in an overall richening or leaning of the mixture A small amount of seat of the pants tuning of the primary mixture can be done but given the multiple adjustments possible and the major effects on drivability and fuel consumption that can result a gas analyzer at a minimum and preferably a dynamometer is really needed to ensure the mixture is correct across the range In practice there are only a few jets and rods available for ThermoQuads basically only those which Ford used in Australian cars so wrecking yard or other cars is really the only source for alternative jets and rods short of manually modifying your existing parts via drilling etc which is not recommended There used to be a
19. wide range of replacement rods and jets available on the US market but I ve never seen any of these here in Australia Secondary Circuit Mixture Adjustment The secondary circuit controls the fuel mixture throught the secondary throats thus is only used under full throttle conditions This mixture is controlled by two fixed jets which are screwed into the underside of the top cover These jets look like two long brass cylinders Thus the only adjustment of the secondary mixture possible is replacement of these jets Seat of the pants tuning is possible here if it feels faster the jets are probably closer to correct Again a run on a dynamometer will enable a more accurate result However availability of alternative jets is limited see my notes above regarding primary jets Secondary Throats Air door Adjustment The ThermoQuads secondary throttles are opened via a mechanical linkage to the primary throttles beginning to open once the primary throttles are approximately 3 4 open and becoming fully open at the same time as the primary throttles become fully open There is also an air door similar to a choke butterfly in appearance mounted at the top of the secondary throats and clearly visible with the air cleaner removed This air door is held closed via a spring and will only open when the vacuum beneath it created by the secondary throttles having opened is sufficient to overcome the tension in the closing spring This air door
20. 00 AT F 3614139 4095 5137 1937 1 1 2 1 6138 72340 F 3614122 4095 5137 1940 1 3 8 1 6139 72340 3614123 4095 5137 1940 1 3 8 6140 172400 F 3614138 4095 5137 1939 1 1 2 1 6144 72340 AT Export 4095 5137 1950 1 3 8 1 6165 172400 CA 3614172 4095 5137 1938 1 1 21 6166 72400 3614173 4095 5137 1938 1 1211 6318 73 340 MT F 3698327 4098 5137 1962 1 3 8 1 6319 73 340 AT F 3698328 4098 5137 1966 1 3 81 6320 173400 HP MT F 3698332 4098 5137 1965 1 1 2 1 6321 73 400 HP AT F 3698333 4098 5137 1966 1 1 2 1 6322 73 440 6 Truck F 3698334 4098 5125 1966 1 1 2 1 6324 73 440 3698336 4098 5125 1966 1 1 2 1 6339 173 340 MT CA 3698339 4098 5137 1962 1 1211 6340 73 340 3698340 4098 5137 1966 1 1 2 1 6341 73 400 MT CA 3698342 4098 5137 1965 1 3 8 1 6342 73 400 3698343 4098 5137 1966 1 3 81 6394 72 73 340 AT Export Fr F 6410 73 440 amp Truck 3698319 4098 5125 1966 1 1 2 1 6411 73 440 HP AT CA 3698329 4098 5125 1966 1 1 2 1 6446 440 Chrysler Marine 3698397 b b 1 21 6452 74360 HP F 3751433 4098 5143 1962 1 1 2 1 6453 174360 HP AT F 3751434 4098 5143 2005 1 1211 6454 74360 HP MT CA 3751435 4098 5143 1962 1 1 2 1 6455 74360 HP CA 3751436 4098 5143 2005 1 1 2 1 6456 74400 HP F 3751439 4098 5143 1966 1 1 2 1 6457 174400 HP AT F 3751440 459
21. 15 360 AT IE early 3830531 4095 5125 2086 1 1 2 2 9008 175 400 AT CA early 3830535 4098 5143 1965 1 1 2 2 9000 75 440 AT F IE 3830536 4098 5137 2109 1 1 2 2 9010 75440 AT CA IE 3830537 4098 5137 1965 1 1 2 2 4 Q 4 N T aa N N 011 75 440 HP AT F IE 3830538 012 75440 HP AT IE early 3830539 4098 5143 1965 1 1 2 2 9013 74360 AT CA late 3751420 5143 9014 74 400 AT CA late 3751419 T BOR Q Q 9015 74 440 HP AT late 3830415 4098 5137 2005 1 1 2 1 9016 74 440 HP AT CA late 3830416 4098 5137 1966 1 1 2 1 9017 74 440 1 Truck AT CA 3830417 4098 5137 1966 1 1 2 1 9019 72 74 e nel 9000 172 7429 9022 74 360 Truck CA 3830401 4098 5143 1966 1 3 8 1 9023 174440 F late 3830403 4098 5137 1966 1 1 2 1 9024 174 440 CA late 3830404 4098 5137 2005 1 1 2 9025 74 440 1 Truck AT F 3830405 4098 5137 1966 1 1 2 1 9027 75 392 IHC F 461280C91 9028 75 392 IHC CA 461281C91 Fr FF xs 9034 75 440 1 Truck MT F 3870944 4099 5143 1965 1 1 2 1 9035 75 440 1 Truck MT CA 3870945 4100 5125 2110 1 1 2 1 9036 75 76 440 1 Truck AT CA 3870946 4100 5125 2110 1 1 211 046 15 400 AT F IE early 3830554 4099 5143 1965 1 120 047 176360 AT F CA IE 9049 74440 HP AT CA late 3830864 4099 5143 1965
22. 3 TQ All 1972 and later solid fuel type carburetors primaries 092 095 098 100 101 104 secondaries 131 137 143 149 needle seats 0935 111 rods 1996 1997 2002 2003 2004 2005 Later Kits AFB AVS Kit Carb Type and Models Covered 10 201 AFB 9000 series all Competition Series All OEM w 2 step rod 110 202 AVS OEM AFB w 3 step rod high step primary jet Specifications Primary Bore Diameter 34 92mm Secondary Bore Diameter 78 58mm Primary Venturi Diameter 26 97mm Float setting 0 75mm Australian Primary metering rod id numbers stamped on the rod itself XC 4 9 Auto 2174 XC 5 8 Manual 2173 XE 4 9 Auto 2354 Common Problems Cracked Warped Main Bodies The plastic construction of the ThermoQuad main body means older ThermoQuads are prone to cracking or warping of the main body resulting in major fuel leaks The best solution to this problem is to simply replace the main body although repair may be possible in some cases This problem and the associated cost of rectification is no doubt one explanation for the proliferation of Holley carburetors now fitted to vehicles which were originally fitted with ThermoQuads Purchasing and rebuilding a good second hand ThermoQuad will cost roughly the same as fitting a new or rebuilt Holley carburetor Flooding Sunken floats Most floats fitted to ThermoQuads are made of a lightweight porous resin Wit
23. 46 Motor Home AT BV E luz 9292 80 360 Truck E lr 1 3 8 3 9293 81318 AT BV F 4179145 13 88 9295 80318 AT BV F Alc 4179051 13 88 9296 80318 Truck MD HD lb d 13 88 9298 80 360 Truck LD MD F 1 3 8 3 9299 80360 Truck LD MD F 1 3 8 3 9304 81 83 Mexico Lr 1 3 8 9305 80360 Lr 13 88 9306 8031802 13 88 9311 81318 Truck LD 38 9314 81360 Truck LD MD F 3 85 9320 8031802 BV k 13 88 9325 81360 Truck LD Can 13 88 9326 82 360 Truck LD MD F 1 3 8 3 9327 83360 Truck LD MD F E JE 13 88 9329 82318 Truck LD 13 88 9330 83318 Truck LD 13 88 9331 82360 Truck LD MD CA Alc F 1 3 8 3 9332 83360 Truck LD MD CA Alc 13 85 9340 83 84 Mexico 13 88 9341 83318 Truck LD 1 3 8 3 9342 82318 Truck BV 4287013 9357 83318 Truck MD HD Fr F 9358 82360 Truck HD F I 11 3 8 3 9359 83360 Truck HD F 13 88 9364 81 84 318 2 4179177 1 3 83 9365 83 318 Truck LD e heb 9366 84 360 Truck LD MD F LE 9367 83318 Truck LD 1 3 8 3 9368 83 318 Truck LD Fr 9369 84360 Truck LD MD CA Ale heb 9370 84 360 Truck HD b Ji 1 3 8 3 9371 84318 Truck MD HD 1 3 8 3 9372 81 82318 AT F 02 4179179 3 8 3 9377 8131
24. 6319 6320 6321 6322 6324 6339 6340 6341 6342 6410 6411 6456 6457 645 9 6460 6461 6462 6463 6503 9008 9009 9010 9011 9012 9014 9015 9016 9023 902 4 9046 9049 9050 9051 9052 9053 9054 9056 9057 9058 9059 9062 9063 9064 906 5 9066 9068 9069 9072 90 73 90 74 9077 9078 9080 908 1 9094 9095 9097 9099 910 0 9101 9102 9103 9108 9112 9114 9116 9119 9127 9140 9149 9153 9182 9188 919 0 9221 9243 9251 9252 9254 9275 9279 9281 9288 9292 9296 9359 9370 9375 937 6 9379 Carter 170 1409 non electric assist 6518 9000 9117 9118 9150 9151 9212 9214 9357 9358 9371 Carter 170 1490 Chrysler 4027792 4095984 3830548 4027714 4095341 Hygrade CV172 CV174 6452 6453 6454 6455 6488 9002 9004 9055 9076 9093 9104 9115 9123 9124 912 5 9126 9134 9136 9137 9147 9152 9173 9183 9185 9187 9193 9194 9195 9196 919 7 9198 9202 9207 9208 9209 9210 9211 9215 9216 9217 9218 9223 9224 9225 922 6 9227 9228 9229 9245 9246 9250 9255 9256 9265 9266 9268 9269 9270 9271 927 2 9273 9276 9277 9278 9298 9299 9311 9314 9329 9330 9331 9332 Carter 170 1598 non electric assist 9234 9236 9244 9305 9306 9320 Carter 170 1621 Chrysler 4095331 Hygrade CV241 9325 9341 9342 9364 9365 9366 9367 9368 9369 9386 9389 Carter 170 1675 9283 9284 9293 9364 9372 9374 9385 9388 Carter 170P 1322A 9800 9801 9810 9811 integral choke 9000 series Also note 73 up without electric assist Chrysler 4027795 Hygrade CV370 Choke Pull offs Note Most of the TQs used the same choke pull o
25. 74 400 HP 460 74440 AT F early 3751443 6461 74440 AT CA early 3751444 6462 74440 HP AT F early 3751445 463 74 440 HP AT CA early 3751446 488 74 360 AT CA early 3751451 6489 74400 AT F early 3751452 6496 174400 AT CA BIS e 55 oo WI j Slo Al j N bee 215 ii RE oo CA ww ON m 85 4 Q oo T N 1 1 1 1 5 m QVI ON amp co Mo A 5 m mO UN 1 1 1 p 1 N m Q oo B T N 6503 74400 E e 1 1 2 1 6518 440 3 Chrysler Industrial haa 6545 74 77 440 1 3 Truck F 3751472 4098 5137 2024 1 1 2 1 6550 74 345 392 AT IHC 448582091 1 3 8 1 6551 75 345 392 AT IHC CA 45906422C91 1 81 6568 74 460 AT Ford D4AE BC F haspn 6590 74 392 IHC 451872 91 kk 1 3 8 1 6592 174 345 392 IHC 451916091 1 3 8 1 6614 74 799 4098 5143 1966 1 3 8 6615 74 440 1 Truck 4098 5137 2024 1 1 2 1 6616 74440 1 Truck AT CA 4098 5137 1966 1 1 2 1 9000 74 318 Export 3751474 1 3 8 1 9002 75 76 360 HP F 3830529 4095 5143 1998 1 1 2 2 9004
26. 8 02 4179180 r383 9374 82 83 318 BV O2 11 3 8 3 9375 82318 Truck BV 4241752 1 38 3 9376 82 360 Truck BV 4241753 9379 83 360 Truck F 4287016 EF Fk heb 9380 79 84 Mexico 1 3 8 9385 82 83 318 02 11 3 8 3 9386 84 360 Truck BV Alc _ 9387 84360 Truck BV Fr Fk 9388 83 318 AT BV O2 FF heb 9380 84318 AT O2 4300012 38 9391 84318 AT BV 02 430019 r3X88 9800 9000 series GM 4095 51372110 1 3 8 5 9801 9000 series Chrysler 4095 51252110 1 3 8 5 9810 9000 series GM EGR 4095 5137 2110 1 3 8 5 9811 9000 series Chrysler EGR 4097 5125 2385 1 3 8 5 Australian XC 4 9 Manual TQ 9091 S XC 4 9 Auto TQ 9092 S XC 5 8 Manual 9071 5 XC 5 8 Auto TQ 9085 S XE 4 9 Auto TQ 9333 S Metering Rod Info dimensions in inches 16 is for 71 OEM and CS TQs 75 is for 72 OEM and 9000 series Step sizes listed Econ economy Mid midrange Power power steps Rod Econ Mid Power Notes 16 615 059 40 For CS only 16 616 064 030 For CS only 16 632 057 040 For CS only 16 633 055 040 CS only 16 634 062 030 For CS only 16 635 060 030 For CS only 16 655 062 040 For71 OEM only 16 683 060 035 For 71 OEM TQ only 16 683 058 035
27. Carter ThermoQuad Information Page Overview The Carter ThermoQuad carburetor is an American designed and built carburetor and was original equipment on many American Chrysler V8 vehicles built during the 1970s It was fitted to Australian manufactured Ford vehicles fitted with V8 gasoline engines built between 1977 and 1982 These years correspond to the Falcon models XC through to XE The Carter Thermo Quad is a four barrel carburetor with a spread bore throttle bore configuration It was designed as an emissions capable carburetor that retained or surpassed secondary throttle performance of earlier Carter carburetors while delivering superior primary fuel economy The Thermo Quad consists of three main sub assemblies an aluminum fuel bowl cover a phenolic resin main body and aluminum throttle base assembly The Thermo Quad derives its name from the phenolic main body Due to the material of the body the carburetor bowl can stay 20 degrees cooler than an all metal carburetor in the same environment Chrysler Corporation used the Thermo Quad in cars and trucks 1971 1984 Carter also produced aftermarket versions This guide is intended to provide information for identifying Thermo Quad carburetors and related items It provides a basic history and basic descriptions of the carburetor and its subsystems It is not intended as a full theory of operation manual or a repair manual Service documentation should be consulted for repair procedures an
28. IE then to manifold vacuum It is also integrated into the EGR delay circuit The IE port can be retained or capped if capped the carb behaves normally Altitude Compensator Alcomp Alc This device alters the high speed metering circuit by sensing atmospheric pressure It mounts to the same area as the IE system at the front of the bowl cover This system is also a drivability enhancement which also reduces emissions by allowing the TQ to compensate for elevation This can be disabled by blocking the air passage ports or the front vent pipe to allow a normal full rich condition for the high speed circuit Solenoid Bowl Vent BV Most 1978 and later TQs have an electric bowl vent solenoid that replaces the earlier mechanical vent 72 77 TQs used a linkage actuated bowl mounted vent that fed to the ECS charcoal canister 71 TQs actuated the same way but vented to the oil breather or the atmosphere The later units vented through the rear base The vent mechanism closes to vent to the ECS canister with the engine off When started engine vacuum opens the vent and the electric solenoid is powered to hold the vent open during low vacuum conditions The electric power is supplied by the ignition run circuit While running or off idle for earlier TQs the bowls vent inside the air cleaner Vents should be retained for all types The solenoid bowl vent could be redesigned to eliminate the solenoid by adapting earlier parts but the remachining
29. N T N N 078 177440 AT F IE 4027737 9080 77 440 HP AT F IE 4027739 4098 5137 2179 1 1 2 2 9081 77 440 HP AT CA IE 4098 5137 1950 1 1 2 2 9093 77 360 HP AT F CA IE 4027742 14092 5143 2195 1 382 9094 176 440 HP AT F 4006648 4099 5137 2103 1 1 2 2 19095 76 440 HP AT CA 4006649 4098 5137 2153 1 1 2 2 9096 77 440 Truck AT CA 4041553 4099 5125 2110 1 1 2 1 9097 16 400 AT LB 4006654 4099 5143 2086 1 120 9099 76400 AT late 4099 5143 2145 1 120 9100 176400 Can late 4099 5143 2144 1 1 2 2 9101 17440 AT IE 4027750 4098 5137 2210 1 1 2 2 9102 77 400 HP AT F 9103 77 400 HP AT F 4027761 4098 5143 211 1 1722 9104 78360 AT F IE BV 4041826 4092 5110 1940 1 3 8 3 9108 78 400 AT Can Exp 4041836 4098 5143 2159 1 128 9109 78440 AT F IE early 4041830 haa 9110 78440 CA IE 4041831 b 1 1 2 3 _ 9111 78440 AT Can Exp IE 4041837 b 1 1 2 3 9112 78440 HP AT IE 4041832 4098 5125 2179 1 1 2 3 9114 177440 AT Can 4098 5137 2159 1 1 2 2 9115 77360 Alc 4027727 4092 5137 1938 1 3 8 2 9116 78 440 Truck MD IE CA 4095406 4098 5137 1950 1 1 2 3 9117 78 440 Truck HD CA 4095407 4099 51252110 1 12 9118 78 440 Truck HD 4095423 4098 51252110 1 1 28 9119 77 440 HP AT CA 4027770 4098 5125 1950 1 1 2 2 9123 78318 Truck MT 4095427 4092 5110 1997 1 3 8 3
30. Tools Air Valve Tool Carter 109P 397 Miller Special Tools C 4152B Strip Kits Carter produced Strip Kits in the 70s through the mid 80s for the Thermo Quad These are tuning kits for modifying the performance of the TQ They consist of various metering rods primary and secondary jets and needle seats There were kits for the Competition Series and specific kits for the early OEM 9000 TQs Later Carter consolidated the kits for the 72 later OEM and 9000 series into a single kit Carter also offered kits for the WCFB AFB and AVS four barrels A current version of the AFB kit is still available All the TQ kits and others have been discontinued Following is a listing of the early and late TQ kit contents The other kits are also listed as a reference Early Kits CS and other carbs Kit Carb Type and Models Covered AFB 3783 4758 4759 4761 9500 9625 m AFB 4760 4762 102 0 AFB 3361 3720 3721 3804 10 m 104 TQ CS4846S CS4847S press in jets TQ CS4846SA CS4847SA screw in jets 10 oc AVS all 10 4139 4324 4325 4343 4402 4430 4431 4432 4619 4620 4621 4742 107 4745 4746 4969 4970 4971 10 2669 2816 2817 2818 3059 3060 3061 3190 3191 3500 3501 3696 108 3697 10 WCFB 2214 2218 2219 2330 2351 2361 2366 2419 2505 2574 2575 2626 109 2627 2656 2657 2829 2830 3181 3769 Early Kits OEM and 9000
31. are at idle position Later models with solenoid idle stop combined the functions It is located on the bracket on the right front A throttle shaft attachment contacts it Throttle Position Transducer TPT 776 81 This appeared with Lean Burn It signals the position and movement rate of the throttle to the computer It is attached via the same bracket as the Ground Switch Solenoid Idle Stop SIS 81 84 Used to set the idle higher than the basic curb idle when additional heavy accessory load ie rear window defogger air conditioning is placed on the engine This mounts on a bracket on the right front Dashpot Some models primarily trucks may have a dashpot to slow throttle closing rate to reduce stalling Mounted on a bracket on the left front Vacuum Pull Off Choke A few models may have an additional pull off mounted on the left rear This connects to manifold vacuum via a control switch in the vacuum plumbing It prevents choke operation after engine warm up Throttle Position Solenoid TPS 75 later some models Mounts in the same place as the idle solenoids and is used to delay full throttle closure at deceleration to prevent a momentary rich condition thus protecting the catalytic converter s Vacuum Throttle Positioner VTP 75 later some models Mounts in the same place and performs the same function as the Throttle Position Solenoid Also serves as a speed sensor Pulse Solenoid Oxygen Feedback Control O2 81 84
32. bottom surface has tabs for gasket location If these break repair is not required if the break does not extend into the bowl Small breaks around the screw holes do not require repair if the break does not extend into other areas Idle transfer slot If the primary throttle plates are opened too far in an attempt to set the idle speed the idle transfer slot may be exposed to the airflow This can result in an off idle hesitation Correction can be made by drilling a 1 16 1 8 hole in the forward half of each primary throttle plate The holes allow sufficient airflow for speed setting without exposing the idle transfer slot Step up piston spring The step up piston spring resists vacuum pull on the piston In cases where idle vacuum 15 too low to allow stable holding of the step up piston the spring may be trimmed to reduce its force Commercial rebuilders Carburetors that are mass rebuilt by commercial rebuilders have their useful service life shortened or ended This usually stems from mixing parts bad service procedures and cleaning by tumbling or blasting Tumbling and blasting removes the factory finishes This leads to accelerated wear and corrosion problems In the case of the TQ the factory linkage was cadmium or iridite finished The throttle shafts were Teflon coated Tumbling or blasting removes these finishes and will lead to corroded or sticking linkages and binding or leaky shafts Tumbling or blasting can damage the TQ phenoli
33. c fuel bowl These processes further damage jets rods and internal orifices Mixed parts without proper analysis can result in a poorly performing or useless unit A carburetor from a rebuilder of this nature requires careful examination to determine its future usefulness Model Codes Abbreviations AT Automatic Transmission MT Manual Transmission No reference means both transmissions Pr Primary Jet Sec Secondary Jet Rod Primary metering rod Bore Primary throttle plate diameter in inches secondaries are 2 1 4 HP High Performance CA California application generic for CA N95 F Federal application No reference means both Federal and California Can Canada application Typically Canada used Federal carbs except noted LD Light Duty MD Medium Duty HD Heavy Duty LB Lean Burn ESA Noted on 76 s After 76 most F cars were LB N92 N94 IE Idle Enrichment Alc Altitude Compensator Few noted most CA and last years had Alc N96 HA High Altitude BV Bowl Vent valve O2 Oxygen feedback solenoid Thermo Quad Listing Model Application Pri Sec Rod Bore Kit 4846S Competition Series 331 341 615 1 128 4846SA Competition Series 3080 3116 615 1 1 28 4847S Competition Series 331 341 616 1 1 2 8 4847SA Competition Series 3089 3116616 1 1 28 _ 4972 71340 MT 3512820 3074 3125 655 1 3 86 4973 71 340 3512821 3074 3125 655 1 3 8 6 6090 1724
34. d on the throttle cable bracket This solenoid activates when the ignition is powered on and determines the primary throttle plate position when the engine is idling The base idle screw determines primary throttle plate position when the ignition is powered off The base idle screw is usually set so that the primary throttle plates are almost fully closed but not able to bind in the bores The curb idle solenoid is adjusted to provide a smooth idle at normal engine running temperatures Shutting the ignition off will cause the solenoid to retract allowing the primary throttle plates to revert to the base idle almost closed position reducing the likelihood of engine run on a necessary consideration given the low octane fuels of today and the high inlet air temperatures of the pollution controlled cars the ThermoQuad is fitted to Note The idle solenoid is not strong enough to open the throttle plates by itself so it will usually be necessary to apply a slight pressure to the accelerator pedal when starting the engine Once the engine starts the throttle solenoid will snap into position and will hold the throttle in the correct position once the accelerator is released Note If the idle solenoid becomes faulty it is possible to replace it with a bolt of the same thread as the solenoid body This bolt can then be used to set the curb idle simply by screwing it in or out to obtain the desired idle setting Doing this will mean the throttle
35. d service details The factory service manuals provide good service procedures and theory for specific models Other sources may be consulted for general repair and modification procedures as well as theory of operation See the list of references for sources This guide is written with carburetor swapping in mind Thus certain items discussed with modification consideration ie emission subsystem disablement with the intent for adapting a non original carburetor and or enhancing performance The modification and adaptation of the carburetors may present legal issues so consider the interest of any appropriate government s As fitted to Australian vehicles the ThermoQuad is a two stage four barrel carburetor with electrically activated automatic choke It is a spread bore design with secondary throats twice the size of the primaries See the picture below for an illustration of the relative size of the throttle bores The secondary throttles are opened by a mechanical linkage to the primary throttles starting to open when the primary throttles are roughly 3 4 open with both primary and secondary throttles becoming fully open at the same time A spring loaded vacuum operated air door above the secondary throats prevents airflow through the secondaries until engine demands are sufficient to use the extra flow thus aiding a smooth transition to wide open throttle Features The Carter ThermoQuad features a plastic phenolic resin
36. dified engines for example a radical camshaft profile will make tuning for good idle quality quite difficult Finally it s also assumed that you ve got some sort of clue about mechanical things If the instructions below really don t make any sense you re probably best leaving these jobs to a professional By all means contact me if you think some clarification would be useful though Float Level Adjustment Adjustment of the float level requires the removal of the carburetor top cover Since this operation results in almost complete disassembly of the carburetor it s a good time to consider fully rebuilding the carb Usually float level adjustment is only part of a full carb overhaul If the carburetor is old enough and worn enough to have developed float level problems it s probably time for a full rebuild anyway The ThermoQuad has two separate fuel bowls within each side of the carburetor body There is an individual check valve needle and seat for each bowl and each valve has it s own float by which it is activated The check valves are located within the top cover and the floats also hinge from the top cover The majority of hardware in a ThermoQuad is mounted to the top cover Before attempting to adjust the float level it s a good idea to fit new check valves as the float level is meaningless if the check valves aren t sealing To set the float level hold the top cover with floats installed upside down and measure the cl
37. e 70s and Ford used them in 1974 The Thermo Quad was available with two primary throttle bore sizes 1 3 8 and 1 1 2 Flow ratings CFM vary depending on the source but the TQs with the 1 3 8 bores are listed as 750 800 CFM and those with the 1 1 2 primary throttle bores are rated at 800 850 CFM All TQs have the 2 1 4 diameter secondary throttle plates The primary bore size depended on application In general all 78 and later 318s and 360s and all 340s had the smaller bore Earlier 360s varied depending on application most 400s and all 440s had the large bore The 9000 series have the small primary bore and were rated by Carter at 800 cfm Later TQs ie Lean Burn and ESA applications feedback systems are quoted with less flow ratings but this is due to the control of the carburetion system not the inherent flow capability of the basic carburetor The internal metering is set for leaner running conditions for Lean Burn Either bore size can be tuned to run well on most engine combinations The smaller bore offers a slight increase throttle response but less overall flow The different bore sizing ie spreadbore is an aspect that can lead to increased fuel economy while delivering similar wide open throttle WOT performance to an equivalent standard bore configuration The adjustability of the TQ and the spreadbore configuration allows the use of a large CFM carburetor on a small displacement engine The TQ gets its name from the pheno
38. e hidden mixture screws The Competition Series have raised pads on the upper bowl cover for a label Also the CS have minimal external attachments such as the lack of a PCV port The mixture screws are similar to the 71 OEM TQs The fuel inlet on the CS and the 78 84 OEM units was located in the rear center and the 71 77 OEM and 9000 series have the fuel inlet on the right rear side The aftermarket 9000 series were available in 4 models 9801 9811 9800 9810 The 9801 9811 have Chrysler linkage 9801 9811 is EGR capable Note later OEM TQs model number started with a 9 as well but are not to be confused with the aftermarket 9000 series with 1 3 8 primary throttle bore will have 2 315 stamped on the throttle plates 1 1 2 units will have 2 314 stamped on the plates secondary plates are stamped with 2 312 Subsystems This section briefly describes the primary Thermo Quad subsystems that are readily accessible and the various attachments for emissions For detailed theory of operation of the sub systems or general operating functions such as the low and high speed metering circuits refer to the references listed in the References section specifically the Carter Thermo Quad service manual See the Service Parts Information section for details on parts and part numbers Jets jets are contained in the primary and secondary circuits one for each barrel Early CS units had press in jets retained by o rings
39. earance between the top cover gasket surface and the underside of each float By underside I mean the surface that would be the top of the float when the carb is assembled and sitting right side up but is now the underside since you are holding it upside down This clearance should be about 0 75mm or 0 030 The idea is that the check valve is fully closed JUST BEFORE the float contacts the top cover If this check indicates the float level requires adjustment it s necessary to remove the float and bend the float arm about 1 3rd of the way along it s length from the pivot end Bend the arm enough to obtain the required clearance Choke Adjustment Adjusting the automatic choke on a ThermoQuad is probably the most complex procedure a ThermoQuad requires however once correctly adjusted it will ensure easy starting and smooth running under all operating conditions Idle Mixture and Speed The ThermoQuad idle mixture is controlled by two idle screws in the front of the throttle flange one for each primary throat These regulate the flow of fuel through the idle ports in the primary throats thus screwing them in reduces fuel flow for a leaner idle mixture screwing them out increases fuel flow for a richer idle mixture Australian ThermoQuads have two idle speed adjustments A conventional idle speed screw on the side of the carburetor top cover assembly controls the BASE IDLE speed CURB IDLE speed is controlled by a solenoid mounte
40. econdaries are opened Before attempting to adjust the air door ensure it is not jammed in any way With the engine off it should be possible to manually push the air door fully open It should move smoothly to its full open position and spring back to a closed position immediately when released With the air door held open it is also possible to check the secondary throttles are working correctly With the choke fully disengaged push the fast idle screw to it s lowest position and hold there if necessary look into the secondary throats whilst moving the throttle lever through it s full range The secondary throttle plates should begin to open when the throttle lever is about 3 4 through it s range and should become fully open once the lever is moved to it s limit They should close smoothly as the lever is returned to it s base position SPRING ADJUSTMENT The air door spring is located inside the carburetor and is wrapped around the air door shaft Looking at the left side of the carburetor the end of the air door shaft is visible almost flush with the surface of the carb top cover The shaft appears to ride in a slotted sleeve and the end of the shaft itself is slotted Spring tension is adjusted by turning the shaft itself The slotted sleeve is actually the shaft lock To adjust the spring tension the lock is released by rotating it counter clockwise spring tension is then increased by rotating the shaft Counter clockwise or decreased
41. ection 30 9 3 1 83 Mopar Mailing List MML postings Disclaimer The information presented on these pages is the product of Internet research only No help or approval was granted from Carter Chrysler Ford Carburetor Doctor or others Reference sources are credited above Zip kits are available from http www carbkitsource com A portion of the information included is intended for Australian ThermoQuad vehicles however also applies to North American Carter ThermoQuads
42. eted to the top of the spring housing Drill out these rivets and remove the cover The bi metallic disc and it s own small retracting spring is located in a recess under the cover Remove the disc and it s spring In the bottom of the recess is a small terminal which supplies current via the switch to the main choke spring Drill out the bottom of the recess including this small terminal to reveal the heavy metal base which the spring is mounted on Solder a copper strap of at least lamp rating between this base and the cover plate Replace the cover plate and screw in place The air pipe to the exhaust manifold can now also be removed as it is not needed any longer Block the fitting to the spring housing with a suitable nut or bolt to prevent the ingress of dirt This procedure is simpler with the spring housing removed from the carburetor Be sure replace the housing in its original orientation as rotation in either direction affects the choke adjustment With the thermatic switch bypassed the choke will begin to disengage as soon as the engine has started becoming fully disengaged maybe five minutes after the engine is running This won t be problematic in most cases See the choke adjustment section below should poor cold running become apparent after this modification and compensatory adjustment required Another solution is to install a manual choke conversion kit widely available from auto parts stores and carburetor specialists for arou
43. ff Many 81 84 units used the same diaphragm with a different bracket for the tamper resistant housing Some 81 84 Dodge trucks IHC units and Ford used a secondary pull off The listed pull offs cover most applications Carter 202 742 202 664 71 up Chrysler 3621210 4049239 4049240 4049275 4131250 71 up Hygrade 77 71 up IHC 460369C1 74 80 Ford D4AZ 9J549a 74 KEM CP 146 71 up Carter 202 818 81 84 tamper resistant Chrysler 4267133 81 84 tamper resistant Hygrade CPA276 81 84 tamper resistant KEM CP319 81 84 tamper resistant Carter 202 821 81 84 secondary pull off Chrysler 4267137 81 84 secondary pull off Hygrade CPA269 81 84 secondary pull off KEM CP320 81 84 secondary pull off Carter 202 981 84 secondary pull off vacuum controlled Miscellaneous Parts O ring main well cavity Carter 163 90 Chrysler 3685655 or 3549406 Needle amp Seat Chrysler 3621161 Carter 25 1086 OEM size Hygrade VN87C Accelerator pump Chrysler 4094867 Carter 64 465 Spreadbore squarebore adaptor MP P4007522 Edelbrock 2691 Air horn gasket Chrysler 53030600 1 4 spacer base gasket Chrysler 3698365 Set of four 1 4 spacer base gasket 3698365 MP P4007902 Solenoid Bowl Vent Carter 213 93 78 213 145 79 84 Truck 79 80 CA 213 211 81 CA MT Can 81 84 Export 213 111 80 84 Mexico 213 229 CA AT Truck 213 240 81 CA late Truck Pulsing Solenoid O2 213 193 81 84 318 car
44. for CS with press in jets 120 5 is for 72 and later solid fuel OEM amp 9000 series Jet Size 120 339 110 120 340 113 120 341 116 120 342 119 120 343 122 120 344 125 120 3113 113 120 3116 116 120 3119 119 120 3122 122 120 3125 125 120 3128 128 120 3131 131 120 5110 110 120 5125 125 120 5131 131 120 5137 137 120 5143 143 120 5149 149 i N denotes part of 10 203 Strip kit Needle and Seat Info dimensions in inches INeedle Seat 25 1068 111 For CS only 25 1069 120 For CS only 25 1070 125 For CS only 25 1086 0935 stock OEM 25 1091 125 25 109 111 denotes part of 10 203 Strip kit Accelerator Pump Cluster squirter Info dimensions inches Cluster 48 365s 48 369s 0 031 148 3705 035 48 374s 075 121 662 i gasket denotes part of 48 380U package Carb Kits Zip Kits IRef Carter Hygrade Kem B W Chrysler 1 902 299 657 15543 10416 24 2262A 15543A 3837521 2 902 310A 902 329 4 902 3304 657 1574 1423 115605 15711C 15711C 110478 10634 24 2268 15605 4131180 24 2276 15711 4271945 15711C 8 902 318A 6 902 292
45. g so don t tighten the locknut yet Turn the ignition off and check that the solenoid retracts and the base idle throttle lever seats on the base idle screw Note if the idle solenoid does not extend when the ignition is turned on or does not retract when the ignition is turned off check that there is 12 volts at the solenoid wire when the ignition is on and 0 volts with the ignition off If the voltage is OK then the solenoid will need to be replaced about 120 from Ford last time I checked FINE TUNING Note A tachometer or engine tuning multimeter with tachometer will be useful here 1 Start the engine and allow it to warm up to normal operating temperature Adjust the idle solenoid by screwing it in or out until a smooth idle of about 700rpm to 900rpm is obtained 2 Screw both idle mixture screws out counter clockwise 1 4 turn The engine speed should increase slightly If engine speed does not increase go straight to step 3 Continue to screw both idle mixture screws out 1 8 turn at a time each until engine speed no longer increases Note if step 2 initially causes engine speed to drop screw both mixture screws in by equal amounts 1 8 turn at a time until engine speed slightly increases then go to step 3 3 Screw both idle mixture screws in clockwise 1 8 turn each Repeat this until engine speed begins to drop slightly When engine speed drops screw both mixture screws out counter clockwise 1 16
46. h time many years the floats can become saturated with fuel and sink causing the needle and seat to remain open resulting in severe flooding of the carburetor The only solution is to replace the floats which are readily available and cost something around 50 Stuck Choke The ThermoQuad choke is activated by a bi metallic spring enclosed in the black Bakelite housing on the side of the carburetor When the engine is cold the spring contracts closing the choke When the engine is running the spring is heated by a 7 volt electric current usually taken directly from a terminal on the vehicle s alternator As the spring is heated it releases and allows the choke to open Incorporated into the top of the spring housing is a thermatic switch which controls the flow of current to the spring This switch is comprised of a bi metallic disc which is heated by a flow of air from the exhaust manifold which is drawn via a pipe between the spring housing and exhaust manifold past the switch and into the carburetor Once the switch is heated it closes and initiates the flow of current to the spring This thermatic switch often becomes inoperative with age resulting in the choke remaining permanently closed This results in extremely rich mixtures fast idle speed and excessive fuel consumption One solution to this problem is to bypass the switch as follows The electrical connection to the spring housing is an extension of a metal cover plate riv
47. itioner is external to the TQ and is used for catalytic converter protection and or a speed sensor It can be removed if not needed Throttle Position Transducer TPT The positioner is external to the TQ and is used to signal throttle position and movement rate to the computer It can be removed if not needed Ground Switch The switch is externally to the TQ and is used to signal throttle closed to the computer It can be removed if not needed for a computer or for idle adjustment Idle screw adjustment ELB ESA TTQs Lean Burn carburetor idle speed is controlled with the curb idle adjustment screw that contacts the throttle closed switch contact This contact signals the Spark Control Computer that the engine is at idle or not The contact is mounted on a bracket on the passenger side of the carburetor There is also a transducer but it is to sense throttle position and opening rate Some had the conventional idle screw based on application There are two approaches to the idle adjustment 1 retain the throttle closed switch contact bracket on the passenger side and adjust the idle there this was the factory curb idle adjustment 2 Drill and tap the boss for the conventional idle screw Drill the boss perpendicular and near the center but align the hole with the throttle bracket extension The factory screw size is 10 32 This approach yields an idle adjustment screw like earlier TQs had Adding vacuum advance port to ELB
48. l available for it The CS TQ was not intended for street use thus it lacks provisions for many street engine items Carter released the 9000 series in the latter 70s It is a good unit for most applications It is the same design as the TQ with minimal emissions devices In 76 Chrysler introduced Lean Burn ELB which evolved into Electronic Spark Advance ESA The 76 80 carburetors can be adapted for use in earlier vehicles Many need idle screws and vacuum ports added Most 78 and later TQs use a more complex bowl venting arrangement The IHC carburetors are fairly simple like pre 76 Chrysler TQs 1980 TQs began receiving a pulsing solenoid as part of an oxygen sensor feedback system to allow more computer control of the mixture The TQs from this period are the most complex and least desirable units There were several internal metering and passage changes that occurred over the years for emissions Most TQs can be tuned to match most applications The later carburetors however will need extra adaptation for earlier vehicles The Competition Series carbs should generally be avoided except for racing The aftermarket 9000 series were available in 4 models 9801 9811 9800 and 9810 The 9801 9811 have Chrysler linkage 9811 is EGR capable Note later OEM TQs model number started with 9 as well not to be confused with the 9000 series The 9801 9811 is the preferred aftermarket TQ Because TQs are out of production since 1985 new
49. lic resin main body This is sandwiched between the aluminum bowl cover assembly and the lower throttle flange assembly The plastic body keeps the fuel 20 degrees cooler than an all metal carb in the same environment leading to less percolation problems and increased performance due to a denser charge The TQ is a metering rod based carburetor like other Carters AFB AVS BBD The primary jets are housed in the plastic body the primary metering rods are suspended from the cover mounted step up piston assembly into the jets in the 71 TQ and the CS the primary jets are also housed in the cover Engine vacuum related to load controls the position of the metering rod in the jet metering the fuel flow The secondary jets are suspended from the cover Secondary flow is controlled by variable venturi effect in the secondary bores The TQ secondary throttle plates are controlled by direct mechanical linkage airflow is controlled by a secondary spring tension resisted air valve The valve is further controlled and damped by the choke pull off diaphragm The OEM TQs have a divorced choke 73 up with electric assist in most applications the 9000 series have an integral electric choke and the CS was equipped with a manual choke All OEM TQs and later CS have screw in jets Early CS retained the jets via O rings Identification To identify TQs the model number is stamped on the lower left rear bolt flange Earlier TQs also had a tag under
50. like like the 72 and later TQs which were solid liquid fuel metered The Competition Series CS was available in 850 cfm and 1000 cfm ratings CS units use a manual choke and have a minimal amount of external attachments compared to OEM production units The CS was discontinued in the mid 70s Carter released the 9000 series in the latter 70s as replacement carburetors for Chrysler and GM Quadrajet applications The 9000 series was very similar to the production Chrysler Thermo Quads In 1972 the OEM Chrysler TQs changed to the solid fuel metering type The TQ coverage was expanded to include the 400 engine By 1973 all Chrysler 4 bbl applications were TQs except some 413 truck models which continued to use a Holley carburetor As the years progressed the TQ evolved to meet the continually tightening emissions requirements The changes were numerous Many features were added or modified externally and internally The late 70s contained many variations for the various geographic regions the various features included excluded and the range of applications and engines produced Into the 80s the TQ became more complex but year to year major variation lessened somewhat In 1973 TQs received a port on the base for canister purge and a port on the main body to provide a venturi vacuum signal for EGR applications 1975 saw the introduction of the Idle Enrichment system Altitude Compensator on some models and the Throttle Position Solenoid for the ne
51. llow full bowl volume Other Considerations The TQ can possess the same problems as other carburetors Some of the features of the TQ can create problems specific to its design Common problems can usually be remedied with standard repair and tuning practices Some specific considerations are discussed in this section Main jet wells The primary jets in 772 and later TQs are screwed into a threaded insert in the fuel bowl bottom This area is connected via a small plastic channel to the internal fuel pickup area There is one channel for each jet These channels are attached to the main body with an epoxy adhesive The epoxy can weaken and begin leaking with age Correction can be made by reattaching the wells with new epoxy J B Weld has been found to work Remove the wells and the old epoxy Clean the area and reattach the wells with a small bead of epoxy Remove any surplus epoxy that may interfere with reassembly Bowl warpage Due to the phenolic material construction the fuel bowl can warp The area most prone to warpage is the upper edge corner of the bow at the rear Resurfacing the upper surface can make this correction A large flat file can be used to resurface for corner warpage or other irregularities Warpage of the bottom unlikely may require replacement due to its configuration Bowl breakage Severe breakage may require replacement of the fuel bowl Small breaks and cracks may be repaired with a fuel resistant epoxy The
52. nd 50 This converts the choke to fully manual operation This can be a very effective solution however when working correctly the automatic choke function is very nice giving trouble free starting and running under all engine temperatures Tuning and Adjustment Assumptions The instructions below assume a carburetor which is clean and in fundamentally sound condition with no major leaks and no major modifications If the overall condition of the carburetor is suspect it should be fully stripped cleaned and rebuilt before tuning is attempted Rebuild kits are widely available for around 50 however given the time and effort and skill required it is often much more effective to have the carburetor rebuilt by a professional usually for less than 200 It is particularly important that the main body is not cracked and the floats have not sunk see above It is also important that the two vacuum pots on the rear of the carburetor are working with the engine running they should both be fully retracted It is also assumed that the engine the carburetor is mounted on is in fundamentally good condition with an ignition system in good working order with clean spark plugs of the correct type clean air and fuel filters and a fuel pump in good order delivering fuel pressure within specifications If any of these points are suspect rectify them before attempting to tune the carburetor Note also It will be harder to tune the carburetor for mo
53. nism features automatic choke activation automatic choke pull off an initial throttle setting for starting an automatically reducing throttle setting as the engine warms up and disabling of the carburetor secondary throats whilst the engine is cold The choke activation temperature pull off rate and cold engine fast idle speed are all fully adjustable Two timed vacuum ports are provided on the front of the carburetor base PERFORMANCE CONSIDERATIONS Although not having a reputation locally as a performance carburetor the Carter ThermoQuad is nonetheless a sizeable four barrel carburetor The fully adjustable nature and spreadbore configuration enables tuning for maximum power at wide open throttle with excellent economy and emissions under cruise and idle conditions American ThermoQuads are rated at between 800cfm and 1000cfm which is more than enough for almost any street driven engine and these carburetors have been popular aftermarket fitments in that country Hearsay has it that Australian ThermoQuads are rated at 600cfm although I have not been able to confirm this Even at 600cfm this represents air flow the equivalent of the most popular performance Holley four barrel History and Description General The Thermo Quad TQ was initially released for competition in 1969 Chrysler introduced the TQ on the 1971 340 The first series of TQs including the 71 340 version and the Competition Series TQs were air metered units un
54. nt on the front bowl cover that has a vacuum port that connects to a coolant temperature sensor CCIE then to manifold vacuum with bleed It will also be plumbed into the EGR delay timing system Altitude Compensator or Alcomp Alc 75 81 This is another drivability enhancement It appeared on most California and Federal high altitude cars It appears as a small cylinder attached to the front of the Idle Enrichment system at the front of the bowl cover A small bellows inside reacts to altitude changes and alters the airflow in the high speed metering circuit This improves drivability and reduces emissions by maintaining a correct fuel air mixture Note later vehicles may be equipped with a remote Alcomp sensor fender well to signal the feedback solenoid controller to compensate Bowl Vent BV solenoid 78 84 In an effort to completely capture all fuel bowl evaporative emissions the standard bowl vent was redesigned with a two way valve and holding solenoid at the rear of the carburetor When the engine starts manifold vacuum pulls the valve rubber puck down opening the bowl to the canister port The solenoid is connected to the ignition run circuit and holds the valve open during low vacuum periods while running When the engine is shutdown the valve releases and reseals the float bowl Connects to rear base port color code gold Ground Switch 76 84 This appeared with Lean Burn LB It signals the computer that the throttle plates
55. one of the front bowl cover screws later ones have a bar code sticker on the bowl cover with the Carter model and or a Chrysler part number International Harvester TQs also have a tag under a front bowl cover screw Additional numbers will be found on the carburetor sections These numbers are not used for TQ identification but some can be used to relate one casting to the other note that parts with the same casting number may be machined differently The upper bowl cover has the casting number on the top right of center rear 6 X XXX example 6 2141 6 2080 6 2024 The bowl has the casting number molded on the bottom of the right bowl near the front it is difficult to see with the throttle base the carb 0 example 0 25 0 1823 0 2709 The throttle base has the casting number on the right upper side in a small recess 1 XXXX example 1 2357 1 2294 1 2967 More numbers will be found ink stamped cast or stamped in various areas Moreover numbers are usually stamped below the model number on the lower left rear bolt flange The model number consists of four digits usually followed by S ie 63185 The model number is the primary and documented identifier The 71 OEM units can be identified externally by the mixture screws which protrude at an angle from the base in the same plane as the base later units protrude perpendicular to the base plane but angle upwards from it Note some 1980 and later units hav
56. or secondary air valve control only Hot Idle Compensator Some models are equipped with a compensator to allow extra air into the mixture during high heat conditions If equipped it is located on the bowl cover over the secondary air valve High temperatures can create an over rich idle condition and this compensates for it by allow extra airflow when it opens Idle Stop Solenoid ISS 71 76 Used to set the idle higher than the basic curb idle screw for emissions reduction and to allow further closure of the throttle blades at engine shutdown to prevent dieseling or run on Mounts on a bracket retained by base mounting bolt and screw on the right side for 72 76 71 mounted to the left side of the intake under the carb linkage Exhaust Gas Recirculation EGR port 73 84 not used in some 76 81 Some located on the main phenolic body as a tap into the venturi for vacuum signal Venturi port is connected to a vacuum amplifier if used Some models use a ported signal via a base port on the right front Base ports color coded black Venturi ports are brass Evaporative Control System ECS port 73 84 Used to purge the ECS charcoal canister of collected gas fumes from the bowl vent and fuel tank vent Color coded red Idle Enrichment IE system 75 81 This is a drivability enhancement It supplements the choke function by allowing an even richer mixture during the warm up period to improve drivability This will appear as a small attachme
57. parts are scarce except for common service items Kits are available through Carter Hygrade KEM etc Floats choke pull offs choke assemblies are also available Tuning parts ie jets rods are no longer available new Carter did make rod jet kits Strip Kit but they are discontinued Because replacement jets and rods are no longer available tuning can be limited unless a supply of used rods and jets is obtained Many variations were used in the various applications over the years Jets and rods can be modified The carburetors are easy to rebuild TQs usually work well with just normal service adjustments Adaptations Note for tuning basics and repair procedures see the References section for possible information sources This section considers basic and emission subsystem adaptation possibilities TQ on squarebore intake The TQ requires a spreadbore intake manifold It can be adapted to a squarebore type via the use of an adaptor Several companies make these see Service Parts section Some performance can be lost compared to a comparable spreadbore intake depending on the quality of the adaptor and the transition area Vacuum leaks can be an issue too 1 3 8 vs 1 1 2 The TQs have two different primary bore sizes These units can be interchanged The smaller bore will yield slightly better throttle response but less overall flow Jets rods The jets and metering rod s can be changed on the TQ to tune its performance
58. r ul 9241 79446 Motor ATCABV h val 9243 80318 Can Exp 4179043 13 88 9244 80360 AT F BV Alc 4179044 1 3 8 3 9245 179318 4095495 13 88 9246 179360 AT CA BV IE 4095496 Lr 13 88 9247 179 440 Truck AT Fr I 1 1 2 3 9248 79 440 Truck 1 1 2 3 9250 79 360 AT CA 4095978 1 3 8 3 9251 80360 Truck MD CA 13 85 9252 80360 Truck MD CA k 13 88 9254 80318 Truck BV 13 88 9255 80 85 360 Truck LD MD F 1 3 8 3 9256 179318 AT F Alc 4095979 E JE 13 88 9265 80360 Truck LD MD F 13 88 9266 80 360 Truck LD MD F 13 88 9268 79360 Truck LD MD BV IE F 1 3 8 3 9269 78 79 318 Truck BV 13 85 9270 78 79 318 Truck BV 13 88 9271 78 79 318 Truck BV E 13 88 9272 79360 Truck LD MD IE 13 88 9273 179360 Truck LD MD BV IE 13 88 9275 78 79 360 Truck HD BV F I 11 3 8 3 9276 78 79 360 Truck HD BV 13 88 9277 79 360 Truck HD 13 88 9278 178 360 Truck HD 13 88 9279 80318 Truck F LE 9280 80 85 360 Truck LD MD F 13 88 9281 80360 Truck HD 13 88 9283 81318 AT F 4179132 k 13 88 9284 81 318 AT BV Can Exp 417913 1 3 8 3 9288 80318 Truck LD Can E 13 88 9289 80 446 Motor Home AT BV 1 25 9291 804
59. r models 73 74 and later use nitrophyl floats OEM TQs are equipped with needle amp seat number 25 1086 0 0935 orifice Accelerator pump The accelerator pump is located on the left front and feeds from the left fuel bowl The left side throttle bracket activates the pump There is some stroke adjustability at the upper lever The fuel is transferred via a plastic tube internally to the squirter which resides above the primary venturi Later models have two adjustment holes instead of three and perform a two stage pump that adds additional fuel as the secondaries open Three accelerator pump clusters squirters were available Secondary air valve TQ secondary throttle plates are mechanically linked to the primary on the left side As the plates begin to open the secondary air valve senses the opening and begins to open to provide airflow which starts fuel flow from the secondary jets The initial opening and rate is determined by a counteracting tension spring inside the cover The opening is additionally regulated and dampened by the choke pull off assembly The air valve is contoured and the movement provides a variable venturi effect A secondary fixed baffle is mounted below the air valve A protruding tab limits total air valve movement The counteracting spring tension is adjustable via a slot lock screw on the left side to tune the rate Carter designed a special tool to facilitate this adjustment Some of the CS TQs used an
60. sions under press in caps The caps may be removed for mixture adjustment Interchanging bases fuel bowls upper bowl covers The three main TQ sections are matched for each application Most will interchange mechanically but flow and metering characteristics may not match The sections have casting numbers that will allow some interchange identity but the casting machine work for applications may vary Evaporative Control System ECS 73 and later will have an extra base port for the charcoal canister purge This is not a parasitic device and may be retained without decreasing performance The bowl vent is plumbed to the canister to vent fumes The purge pulls these fumes and those collected from the tank The purge port can be capped to disable it Exhaust Gas Recirculation EGR EGR occurs outside of the carburetor but tuning and vacuum source provisions are incorporated into the various TQs used on EGR equipped vehicles The tuning is usually not a major issue TQs may provide a venturi or a front base port for EGR vacuum signals If EGR is not used these ports can be capped Idle Enrichment system IE This system is a drivability enhancement It allows a richer mixture during the warm up period to improve drivability It supplements the choke function by blocking part of the air bleed to richen it The TQ with IE will have a small attachment on the front bowl cover that has a vacuum port that connects to a coolant temperature sensor CC
61. t be all that smooth In my own experience a fairly light tension on the spring gives the best result but your case may be different Also as always it is assumed the carburetor is otherwise in good condition and correctly adjusted Other factors can mask or worsen a hesitation on transition to full throttle Eg A carburetor that is running over rich may be smoother on opening the secondaries as the rich mixture will mask a momentary leaning out as the secondaries open Reference sources e Carburetor Doctor http www carbkitsource com XC Falcon Workshop Manual published by Ford Australia XC V8 Falcon Service and Repair Manual published by Gregory s Carter Carburetors by Dave Emmanuel published by S A Books Brian Stroud s Carb Tuning Page general advice and ThermoQuad rod size specs Carter Service Manual 3623A Thermo Quad Carter Service Manual 3630A Basic FF acts and Principles Carter Carburetors catalog 3878 April 1975 Carter Floats catalog 1980 Carter Carburetor95 catalog 3788 August 1977 Carter Zip Kits amp Carburetor Components catalog 3880 1991 Carter Carburetor Emission Components catalog 3881 1989 Carter Performance Products catalogs 11979 1980 1982 1984 Carter Strip Kit Specifications amp Instructions 3270 1 73 revised 11 75 Carter Strip Kit label 3272 7 75 Carter Carburetors SA Designs Dave Emanuel 1983 Chrysler Technical Guide Thermo Quad Carburetor 1982
62. turn 4 Adjust idle solenoid by screwing it in or out until desired idle speed is reached Something around 700rpm to 800rpm is appropriate for most standard or mildly modified engines with transmission in neutral Tighten the solenoid locknut Alternative method If you have a vacuum gauge attach it to a manifold vacuum source on the manifold NOT a ported vacuum source such as the two fittings on the base of the ThermoQuad With the engine fully warmed up and idling adjust the idle mixture screws by even amounts each so as to obtain the highest reading on the vacuum gauge Adjust the idle solenoid to obtain the required idle speed Readjust the idle mixture screws to obtain the highest vacuum reading and then recheck the idle speed VERY FINE TUNING Take the car to a workshop garage with an exhaust gas analyzer and let them do it Primary Circuit Mixture Adjustment The primary circuit controls the mixture supplied by the carburetor s small primary throats This mixture is used under light acceleration and cruise conditions The primary mixture is controlled by fixed jets located in the carburetor main body at the bottom of the fuel bowls plus tapered metering rods which hang from the carburetor top cover and limit the fuel flow through the fixed jets The metering rod position and thus the fuel flow through the jets is controlled both by throttle position and engine vacuum thus the mixture is constantly tailored to instantaneous
63. vance black 71 75 some 76 84 5 32 B Idle Enrichment IE gold 75 81 some models 5 32 C PCV gold 71 84 11 32 Note angled on 80 84 models D Canister Purge ECS red 73 82 1 4 E EGR gold or Air Pump blue 5 332 F EGR venturi port brass 1 8 located on phenolic float bowl G Bowl Vent gold 71 77 11 32 located on the upper bowl cover H Air Cleaner Heated Air Temp Sensor black 78 84 5 32 1 Power Brake Tube gold 81 84 111 32 J Air Cleaner Heated Air Temp Sensor black 71 77 5 32 Bowl Vent Solenoid Vacuum Tube gold 78 84 5 32 K Canister Bowl Vent Tube gold 78 84 11 32 L Choke Pull off gold 71 84 5 322 M Choke Pull off Diaphragm natural 71 84 5 32 bolts to TQ base Some other vacuum attachments were used ie Secondary pull off and vacuum throttle positioner these like item M were external to the TQ Choices and Adaptations Choices Chrysler used the TQ from 1971 1984 Ford used it in 1974 on some 460s and International Harvester used it in 74 75 79 80 on 345 392 engines The CS series was available from 69 73 The aftermarket 9000 series was available from 76 late 80s The best OEM years to locate are 72 75 TQs from this period have the least emission control add ons The 71 OEM TQ performs well and have minimal emission considerations Due to its air metered design it is unlike the later TQs and few parts are stil
64. w catalytic converter equipped cars In 1976 Chrysler introduced Lean Burn ignition and the TQ was modified to produce and run on a very lean air fuel mixture An external idle stop switch and throttle position transducer were added In 1978 the TQ bowl vent was modified with the addition of an electric Bowl Vent solenoid An additional rear base port for the vent hose replaced the bowl vent port The fuel inlet moved to the rear center of the carburetor from the previous rear side location Lean Burn became Electronic Spark Advance ESA in 1979 The very lean mixture idea was abandoned but the electronic control of the ignition advance was retained Hidden mixture screws were a feature starting with some 1980 model TQs 1981 introduced a riveted cover for the choke pull off linkage to prevent tampering and the oxygen feedback solenoid on some models Idle Enrichment and Altitude Compensator was not used on feedback models 82 84 did not change much more in a major way The canister purge was eliminated by 1984 in some applications and a power brake port was added to the rear base After 1984 Chrysler stopped using Thermo Quads Instead the Rochester Quadrajet was used through 1989 on cars and until 1988 in trucks when Electronic Fuel Injection replaced them Carter continued to supply the fuel pumps for the Quadrajet equipped vehicles Although Chrysler was the primary manufacturer to use the TQ International Harvester IHC used them in the lat
65. will no longer close down fully when the engine is shut off so the engine may run on when the ignition is switched off If this happens consider spending the money on new solenoid BASE SETTINGS These settings will ensure the engine will at least start and idle If you ve just done a carb rebuild or you re of the opinion that your idle settings are just way off use these settings to begin with They ll enable you to get the engine running then you can proceed to the fine tuning of idle settings below Make these adjustments in the specified order Base idle mixture setting screw both idle mixture screws in clockwise until they seat lightly in their holes Back both screws out counter clockwise 1 5 turns each Base base idle screw setting screw the base idle screw out counter clockwise until it no longer touches the throttle position lever Screw it in clockwise until it just touches this lever and then screw it in exactly 1 additional turn Base curb idle screw setting with the solenoid activated ie ignition on but engine not running you might want to disconnect the power wire to your coil at this point so as not to damage the ignition system whilst making this adjustment loosen the solenoid lock nut and screw the solenoid out until it no longer touches the throttle lever Screw it in until it just touches this lever and then screw it in an additional 2 to 3 turns You ll need to readjust this with the engine runnin

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