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1. Stop the engine and repeat steps 5 and 6 to verify minimum idle speed Stop the engine and disconnect the battery for at least 5 minutes With the engine off reconnect the ignition SPOUT connector ISC air bypass solenoid and PCV and CANP hoses Verify that the throttle is not stuck in the bore and that the linkage does not keep the throttle from closing Run the engine for 2 minutes Snap accelerate and let engine return to idle Lightly depress and release the accelerator and let the engine idle Refer to the VECI decal for curb idle specifications 3 8L V6 1988 92 Car NOTE i For 1991 and later models use Scanner Idle Speed Adjust Functional Test P To adjust idle speed 1 2 3 4 Place the transmission in park AT or neutral MT With the engine off back out the throttle stop screw so it is not touching the throttle lever Place a 0 010 inch feeler gauge between the throttle stop screw and the throttle lever Tighten the throttle stop screw Figure F050 15 so that it touches the feeler gauge then turn it another 1 1 2 turns ISC AIR BYPASS THROTTLE STOP SOLENOID AND VALVE SCREW Figure F050 15 Run the engine at idle for 2 minutes Snap accelerate and let engine return to idle Lightly depress and release the accelerator and let the engine idle Refer to the VECI decal for specifications With an AOD or AXOD transmission check throttle valve TV cable adjustment F165 Ford R
2. Place the transmission in drive AT or neutral MT and let idle speed stabilize Back out the throttle stop screw Figure FO50 17 on page F167 until idle speed is 600 20 AT or 700 20 MT Then back out the screw another 1 2 turn Stop the engine and disconnect the battery for at least 3 minutes To check curb idle speed start the engine and run it at 1800 rpm for 30 seconds Place the transmission in drive AT or neutral MT and let idle speed stabilize Refer to the VECI decal for curb idle specifications 5 0L V8 1986 87 Truck and Van P To adjust idle speed 1 Disconnect the battery for 3 minutes to erase the current idle control program from ECA memory Turn the throttle stop screw in clockwise 1 turn 2 Reconnect the battery place the transmission in neutral or park and run the engine at 1800 rpm for 30 seconds 3 Place the transmission in drive AT or neutral MT and let idle speed stabilize NOTE i Adjustment must be completed within 30 seconds after returning to idle 4 Back out the throttle stop screw Figure FO50 17 on page F167 to adjust idle to 600 20 AT or 700 20 MT rpm Stop engine and repeat steps 2 3 and 4 to verify minimum idle speed Stop the engine and disconnect the battery for at least 3 minutes F168 Ford Reference 7 To check the normal curb idle speed start the engine and run it at 1800 rpm for 30 seconds Place an automatic transmission in drive place a man
3. 50 rpm 1986 AT 900 50 rpm other 1986 87 models 950 50 1988 90 600 25 1991 ISC AIR BYPASS SOLENOID AND VALVE THROTTLE STOP SCREW Figure F050 8 NOTE After a period of engine running time idle speed may change because of idle control strategy 7 8 Stop the engine and repeat steps 3 4 and 5 to verify minimum idle speed Reconnect all vacuum lines and electrical connectors Verify that the throttle is not stuck in the bore and that the linkage does not keep the throttle from closing Check the normal curb idle speed as follows a For 1986 87 models start the engine and run it at 2000 rpm for 60 seconds Place an AT in drive Place a MT in neutral Refer to the VECI decal for specifications b For 1988 and later models run the engine at idle for 2 minutes Then snap accelerate and let engine speed return to idle Lightly depress and release the accelerator and let the engine idle Refer to the VECI decal for specifications F157 Ford Reference 2 3L 4 Cylinder OHC Non Turbo 1987 91 RWD Car NOTE See Reference F053 for 1992 and later models BELOV Ns On 1991 models disconnect the battery for 5 minutes Disconnect the ISC air bypass solenoid Run the engine at 1500 rpm for 30 seconds With the transmission in neutral turn the throttle stop screw Figure F050 9 to set the idle speed Adjust to 525 25 rpm for all 1987 models 525 25 rpm for 1988 calibrations 7 O5A
4. 5 Place an AT in drive 1985 87 or park 1988 and later Place a MT in neutral 6 Turn the throttle stop screw Figure F050 9 on page F158 to set idle speed to the specification listed below 575 25 rpm for all 1985 87 and 1989 90 models 625 25 rpm for all 1988 models 550 25 rpm for all 1991 models 650 150 rpm for 1992 94 AT models 600 150 rpm for 1992 94 MT models F159 Ford Reference 7 Stop the engine and reconnect all electrical connectors Reconnect the ignition SPOUT connector on 1989 and later models Verify that the throttle is not stuck in the bore and that the linkage does not keep the throttle from closing 8 Check the normal curb idle speed as follows a For 1986 87 models start the engine and run it at 1500 rpm for 30 seconds Place an AT in drive Place a MT in neutral Refer to the VECI decal for specifications b For 1988 and later models run the engine at idle for 2 minutes Then snap accelerate and let engine speed return to idle Lightly press and release accelerator and let engine idle Refer to the VECI decal for specifications 2 3L 4 cylinder HSC EFI 1988 91 FWD Car NOTE i See Reference F053 for 1992 and later models P To adjust idle speed 1 On 1991 disconnect the battery for 5 minutes 2 Disconnect the SPOUT connector near the ignition module and verify that base timing is within 2 of specification Refer to the VECI decal Leave the SPOUT connector di
5. R11 and 7 06A R11 650 25 rpm for 1988 calibrations 7 O6A R10 and 8 06A R10 600 25 rpm for 1988 calibration 8 O5A R10 650 25 rpm for 1989 and later AT 600 25 rpm for 1989 and later MT ISC AIR BYPASS SOLENOID AND VALVE Mounted on air cleaner of 1985 88 trucks THROTTLE STOP SCREW Figure F050 9 Stop the engine and reconnect all electrical connectors Verify that the throttle is not stuck in the bore and that the linkage does not keep the throttle from closing Check the normal curb idle speed as follows a For 1987 models start the engine and run it at 1500 rpm for 20 seconds Place the transmission in neutral MT or AT Refer to the VECI decal for specifications b For 1988 and later models run the engine at idle for 2 minutes Then snap accelerate and let engine speed return to idle Lightly press and release accelerator and let engine idle Refer to the VECI decal for curb idle specs 2 3L 4 Cylinder OHC Turbo 1983 89 RWD Car P To adjust idle speed 1 2 3 Disconnect the ISC air bypass solenoid Start the engine and run it at 2000 rpm for 2 minutes Place an automatic transmission in drive 1986 87 or park 1988 and later Place a manual transmission in neutral Turn the throttle stop screw Figure F050 10 to set idle to 750 25 rpm for all models Stop the engine and reconnect all vacuum lines and electrical connectors Verify that the throttle is not stuck in the bore and that the l
6. to the VECI decal for specifications b For 1988 and later models run the engine for 2 minutes Then snap accelerate and let engine speed return to idle Lightly depress and release the accelerator and let the engine idle Refer to the VECI decal for curb idle specifications 3 0L V6 1986 95 Light Truck P To adjust idle speed 1 OO a On 1991 and later models disconnect the battery for 5 minutes For 1986 87 models disconnect the SPOUT connector at the ignition module and verify that base timing is within 2 of specifications Refer to the VECI decal Leave the SPOUT disconnected For 1986 87 models stop the engine and remove the PCV hose at the PCV valve and install a 0 200 inch diameter orifice in the hose Ford tool T86P 9600 A or equivalent Disconnect the ISC air bypass solenoid Start the engine and run it at 2500 rpm for 30 seconds Place the transmission in drive AT or neutral MT Place 1991 and later AT in park Turn the throttle stop screw Figure F050 13 to set the idle speed 1040 25 rpm for 1986 87 MT models 845 25 rpm for 1986 AT models 900 25 rpm for 1987 AT models 625 25 rpm for 1988 90 AT models 725 25 rpm for 1988 90 MT models 600 25 rpm for all 1991 models 600 75 or 50 for all 1992 94 models 600 50 rpm for 1995 Aerostar F162 Ford Reference 10 ISC AIR BYPASS SOLENOID AND VALVE Figure F050 13 Stop the engine then restart and re
7. 50 rpm for 1993 and later 2 0L models 600 to 700 rpm for 1993 and later 2 5L models F174 Ford Reference BLACK TEST pee aan CONNECTOR a wy PIN IDLE AIR Vos ae o N oe N KIS ZENG of Ser Zhen GROUND Figure F050 21 Probe 6 Stop the engine and disconnect the jumper wire from the self test input connector For a Probe with a rolling idle refer to the Troubleshooter tip for idles rough steering wheel vibrates Turn the idle air adjustment screw clockwise to increase idle speed to 1000 rpm Then verify that the ISC motor is controlling rom to the upper limit of the specification 17 P1N DIAGNOSIS CONNECTOR TEN Be mle NNNNS INSTALL JUMPER WIRE HERE STI CONNECTOR STO CONNECTOR IDLE SPEED ADJUSTMENT SCREW Figure F050 23 2 0L MECS Figure F050 24 1 6L MECS F175
8. Reference F051 and Ford service procedures Observe the following precautions e Do not clean any 1993 later throttle bodies e Do not clean black plastic ISC assemblies or throttle bodies with idle air bypass kit e Do not clean either the throttle body or the idle air bypass valve if the throttle body has a yellow and black ATTENTION label e Do not remove the plastic coating from the throttle plates and throttle body bore on a 2 2L Probe engines After minimum idle speed adjustment the electronic control assembly ECA idle speed control program or strategy must be reset The procedures in this reference include instructions for this idle learn operation These instructions must be followed in all cases or idle speed control will not be correct after adjustment In some cases it may be necessary to drive the vehicle for the processor to learn the idle speed control program or strategy Unless directed otherwise the engine should be at normal operating temperature when minimum idle speed is adjusted Each Ford engine requires a specific procedure for minimum idle speed adjustment and idle learning The complete instructions must be followed exactly for every engine CENTRAL FUEL INJECTION CFI ENGINES gt This section contains procedures for all CFI engines Before adjusting idle speed the idle speed control ISC motor must be retracted Retract the ISC motor in one of the following two ways Retracting the ISC mot
9. Subject Symptom Source Ford Reference Minimum idle speed adjustments for fuel injected engines Erratic or incorrect idle speed stalling code 12 13 412 P0505 or P1505 Ford service manuals and service bulletins This reference provides instructions for checking and adjusting the minimum idle speed for most Ford fuel injected engines Also see Reference F069 for idle air bypass kit This reference contains the following procedures CENTRAL FUEL INJECTION CFI ENGINES e 4 Cylinder CFI Engines on page F153 e 3 8L V6 CFI Engines on page F154 e 5 0L V8 CFI Engines on page F155 ELECTRONIC PORT FUEL INJECTION EFI ENGINES e 1 6L 4 Cylinder EFI and Turbo 1983 85 FWD on page F156 e 1 9L 4 Cylinder EFI 1986 91 FWD on page F157 e 2 3L 4 Cylinder OHC Non Turbo 1987 91 RWD Car on page F158 e 2 3L 4 Cylinder OHC Turbo 1983 89 RWD Car on page F158 e 2 3L 4 Cylinder OHC Non Turbo 1985 94 Light Truck on page F159 e 2 3L 4 cylinder HSC EFI 1988 91 FWD Car on page F160 e 2 9L V6 1986 89 Scorpio on page F160 e 2 9L V6 1986 92 Light Truck 4 0L V6 1986 91 Light Truck on page F161 e 3 0L V6 1986 95 Light Truck on page F162 e 3 0L V6 1986 90 Car except Taurus SHO on page F163 e 3 0L V6 SHO 1989 and later Taurus on page F164 e 3 8L V6 1988 92 Car on page F165 e 3 8L Supercharged V6 1989 90 Thunderbird and Cougar on page F166 e 4 9L in l
10. T models 650 25 rpm for 1992 and earlier MT models 650 150 rpm 1993 and later models AT or MT Stop the engine and disconnect the battery for at least 5 minutes Reconnect the ISC air bypass solenoid Verify that the throttle is not stuck in the bore and that the linkage does not keep the throttle from closing Run the engine and let the idle speed stabilize Snap accelerate and let engine return to idle Lightly depress and release the accelerator and let the engine idle Refer to the VECI decal for curb idle specifications MAZDA ELECTRONIC CONTROL SYSTEM MECS This section contains procedures for all MECS engines except the Probe 3 0L 2 0L 4 Cylinder EFI Probe 1993 only P To adjust idle speed 1 2 3 4 Disconnect the idle air solenoid Start the engine and run it at 2500 rpm for 30 seconds Adjust the idle to 650 to 750 rpm Reconnect the idle air solenoid 1 3L 4 Cylinder EFI Festiva 1 6L 4 Cylinder EFI Tracer 1 8L 4 Cylinder EFI Escort GT 2 0L 4 Cylinder EFI Probe Except 1993 2 2L 4 Cylinder EFI and Turbo Probe 2 5L 6 Cylinder EFI Probe For Probe with 3 0L engine see Reference F053 or use the Scanner Idle Speed Adjust Functional Test F173 Ford Reference P To adjust idle speed Connect a jumper wire between the self test input STI connector and ground Figure F050 20 to Figure F050 24 TEN connector on Escort Figure F050 22 Place the transmission in park or neutr
11. adjustment g Stop the engine and reconnect all vacuum hoses HIGH CURB sree DORR SCREWS E spero FAST IDLE SPEED ADJUSTING ADJUSTING SCREW SCREW Figure F050 5 Figure F050 6 4 Adjust the curb idle speed as follows a With the transmission in park start and run the engine at 2000 rpm for 60 seconds b Block the drive wheels and ensure that the parking brake is applied Do not apply the service brakes because engine speed may change c Let the engine return to idle and allow the idle speed to stabilize Then place the transmission in drive Check the idle speed on the tachometer d If curb idle speed is above 550 rpm loosen the saddle bracket lock screw and adjust the idle speed by turning the adjusting screw counterclockwise Figure F050 6 Repeat procedure F155 Ford Reference NOTE This adjustment must be done within 2 minutes after the engine is started If this time is exceeded turn the engine off then restart it and repeat the adjustment e If curb idle speed is below 550 rpm turn the engine off loosen the saddle bracket lock screw and turn the adjusting screw one turn clockwise Tighten the lock screw restart the engine and repeat steps a through c to check the idle speed f If the idle speed adjustment in step e or d is greater than 50 rpm check the transmission linkage and throttle position sensor adjustments ELECTRONIC PORT FUEL INJECTION EFI ENGINES This section contains proc
12. al Start the engine and let the idle stabilize For 1990 4 cylinder Probe run the engine at 2500 to 3000 rpm for 3 minutes with the STI ungrounded Then verify the fan is off and ground the STI connector For all 1991 and later models warm up the engine at 3000 rpm in neutral For 1992 2 2L Probe and Turbo Probe run the engine until fan turns on 1 w NOTE On Festiva models do not adjust the throttle stop screw on the throttle lever IMPORTANT On Tracer models do not tamper with the adjustment screw located to the right of the idle adjustment screw Figure F050 20 Misadjustment of this screw will affect driveability and may damage the throttle body CAUTION DO NOT ADJUST ON TRACER IDLE AIR ADJUSTMENT SCREW Figure F050 20 Festiva and Tracer 5 Adjust the idle air bypass adjustment screw to obtain the following idle speeds 850 50 rpm for pre 1990 Festiva and Tracer Figure F050 20 on page F174 700 20 rpm for 1990 Festiva and Tracer with MT Figure F050 20 on page F174 850 20 rpm or 1990 Festiva and Tracer with AT Figure F050 20 on page F174 750 25 rpm for Probe Figure F050 21 on page F175 See VECI decal for idle speed specifications for all 1991 92 models 800 to 900 rpm for all 1993 1 3L models 700 800 rpm for 1994 95 1 3L models with AT 650 750 rpm for 1994 95 1 3L models with MT 700 to 800 rpm for 1993 and later 1 6L models 700 to 800 rpm for 1993 and later 1 8L models 650 to 7
13. alve and install a 0 200 inch diameter orifice in the hose Ford tool T86P 9600 A or equivalent Disconnect the ISC air bypass solenoid For 1988 and later models start the engine and run it at 2000 rpm for 30 seconds Place the transmission in drive AT or neutral MT Turn the throttle stop screw Figure F050 13 to set the idle speed to specifications 710 20 rpm for 1986 models with processor code EF7 LK7 or LM7 760 20 rpm for 1986 models with any other processor codes 760 20 rpm for all 1987 and later models F163 Ford Reference NOTE All 1986 models Open the glove box and inspect the paper tag on the rear of the processor to find the code Also see Reference F016 for related information 7 8 10 Stop the engine and disconnect the battery for at least 5 minutes With the engine off reconnect the ignition SPOUT connector and the ISC air bypass solenoid Reconnect the PCV hose to the valve Verify that the throttle is not stuck in the bore and that the linkage does not keep the throttle from closing Reconnect the battery and check the normal curb idle speed as follows a For 1986 87 models start the engine and run it at 2000 rpm for 2 minutes Place AT in drive With processor codes EF7 LK7 or LM 7 curb idle speed should be 625 50 rpm For all other models curb idle speed should be 700 50 rpm b For 1988 and later models run the engine at idle for 2 minutes Then snap accelerate and let
14. art the engine and let the idle speed stabilize Then snap accelerate and let engine speed return to idle Lightly depress and release the accelerator and let the engine idle Refer to the VECI decal for curb idle specifications NOTE If idle speed oscillates or is erratic the throttle plates may be open far enough to allow canister purge flow To verify the condition disconnect the canister purge hose and plug it Idle should stabilize If purge is present at idle the throttle plates must be closed until the rough idle stops 9 With automatic overdrive AOD transmission check throttle valve TV rod adjustment 5 0L V8 1986 87 RWD Car P To adjust idle speed 1 Disconnect the battery for 3 minutes to erase the current idle control program from ECA memory Turn the throttle stop screw in clockwise 1 turn Reconnect battery place transmission in neutral or park and run the engine at 1800 rpm for 30 seconds F169 Ford Reference ISC AIR BYPASS SOLENOID AND VALVE THROTTLE STOP SCREW Figure F050 18 3 Place the transmission in drive AT or neutral MT and let idle speed stabilize 4 Turn the throttle stop screw Figure FO50 18 to adjust idle speed to specifications 575 20 rpm for base engine with AT 625 20 rpm for high output engine with AT 700 20 rpm for high output engine with MT NOTE High output engines are marked HO on the intake plenum 5 Stop the engine and disconnect the
15. back the screw out an additional 1 2 turn F166 Ford Reference ISC AIR BYPASS SOLENOID AND VALVE Figure F050 17 Stop the engine disconnect the battery for 5 minutes and repeat steps 2 3 and 4 to verify minimum idle speed To check the normal curb idle speed start the engine and run it at 1800 rpm for 30 seconds Place an automatic transmission in drive place a manual transmission in neutral Let the engine idle for 1 minute Refer to the VECI decal for curb idle specifications 4 9L in line 6 Cylinder 1988 89 Truck and Van NOTE For 1990 and later models use Scanner Idle Speed Adjust Functional Test P To adjust idle speed 1 With the engine off place a 0 050 inch feeler gauge between the throttle stop screw and the throttle lever 2 Disconnect the SPOUT connector near the ignition module and verify that base timing is within 2 of specifications Refer to the VECI decal Leave the SPOUT connector disconnected until adjustment is finished 3 Disconnect the ISC air bypass solenoid Figure F050 17 4 Place the transmission in neutral or park Start the engine and let it idle for 2 minutes 5 With the transmission in neutral or park turn the throttle stop screw Figure F050 17 to set the idle speed to the correct specifications 650 25 rpm for calibrations 7 52ER 7 52KR 7 52MR 7 52QR 7 52RR 7 52ZR 7 52JR 7 72JR 750 25 rpm for all other calibrations before 1990 675 25 r
16. battery for 3 minutes Then repeat steps 2 and 3 to verify the correct curb idle speed Refer to the VECI decal for curb idle specifications 5 0L V8 1988 91 Car except 1991 and later HO Mustang Mark VII P To adjust idle speed 1 Place the transmission in park auto or neutral manual 2 Disconnect the battery for at least 5 minutes 3 With the engine off back out the throttle stop screw so that it is not touching the throttle lever Then place a 0 010 inch feeler gauge between the stop screw and the throttle lever 4 Tighten the screw Figure FO50 18 on page F170 so that it touches the feeler gauge then turn it another 1 1 2 turns 1988 90 HO engine or 1 7 8 turns base engine 5 Reconnect the battery start the engine and run it at idle for 2 minutes Then snap accelerate and let engine speed return to idle Lightly depress and release the accelerator and let the engine idle Refer to the VECI decal for curb idle specifications 6 For automatic overdrive AOD transmission check throttle valve TV cable adjustment 5 0L V8 HO 1991 94 Mustang and Mark VII NOTE For other 1991 and later HO engines see Reference F053 F170 Ford Reference P To adjust idle speed 1 2 3 Place the transmission in park AT or neutral MT Disconnect the battery for at least 5 minutes With the engine off back out the throttle stop screw so that it is not touching the throttle lever Then place a 0 025 inch feeler
17. connector disconnected until adjustment is finished Disconnect the ISC air bypass solenoid Figure F050 17 on page F167 Place the transmission in neutral or park Start the engine and let it idle for 2 minutes With the transmission in park or neutral turn the throttle stop screw Figure F050 17 on page F167 to set the idle speed to specifications 780 50 rpm for 1988 models with AT 730 50 rpm for 1988 and later models with MT 780 50 rpm for 1989 and later models with C6 transmission 730 50 rpm for 1989 and later models with E4OD transmission F171 Ford Reference NOTE If the screw must be turned inward stop the engine Make an estimated adjustment start the engine and repeat steps 4 and 5 before continuing 6 Stop the engine and disconnect the battery for at least 5 minutes 7 Remove the feeler gauge from the throttle stop screw and reconnect the ISC air bypass solenoid Reconnect the ignition SPOUT connector Verify that the throttle is not stuck in the bore and that the linkage does not keep the throttle from closing 8 Run the engine and let the idle stabilize Snap accelerate and let engine return to idle Lightly depress and release the accelerator and let the engine idle See the VECI decal for specifications NOTE If idle speed oscillates or is erratic the throttle plates may be open far enough to allow canister purge flow To verify the condition disconnect the canister purge hose and plug it Idle shoul
18. crew and turning the bracket adjusting screw to obtain a 7 32 inch gap between the ISC motor tip and the throttle lever check the gap with a 7 32 inch drill bit 4 Tighten the ISC bracket lock screw and reconnect the ISC motor harness THROTTLE STOP SCREW iSC BRACKET ADJUSTING SCREW ISC BRACKET LOCK SCREW Figure F050 4 F154 Ford Reference 5 0L V8 CFI Engines P To adjust idle speed 1 Connect a tachometer to the engine Apply the parking brake and disconnect and plug the vacuum hose for the vacuum operated parking brake Then start the engine and warm it to normal operating temperature 2 Ensure that vacuum is not present at the vacuum operated throttle modulator VOTM If vacuum is present verify that the engine is fully warm and that all air conditioning and ventilation controls are switched off 3 Adjust the fast idle speed as follows Turn the engine off Disconnect and plug the vacuum hose at the EGR valve Disconnect and plug the evaporative purge hose at the throttle body spacer Place the transmission in park and restart the engine Place the fast idle cam on the highest step Figure FO50 5 Start the engine and turn the fast idle adjusting screw to set the engine speed to the rpm listed on the VECI decal oao NOTE i This adjustment must be done between 20 and 60 seconds after the engine is started If this time is exceeded turn the engine off then restart it and repeat the
19. d stabilize If purge is present at idle the throttle plates must be closed until the rough idle stops 9 With automatic overdrive AOD transmission check throttle valve TV cable adjustment 7 5L V8 1987 Truck and Van P To adjust idle speed 1 Disconnect the ISC air bypass solenoid 2 Start the engine and run it at 1800 rpm for 20 seconds 3 Place the transmission in drive auto or neutral manual NOTE i Adjustment must be completed within 30 seconds after returning to idle 4 Turn the throttle stop screw Figure FO50 19 until idle speed is 650 20 rpm 5 Stop engine and repeat steps 1 2 and 3 to verify minimum idle speed SCREW ISC AIR BYPASS SOLENOID AND VALVE Figure F050 19 6 Stop the engine and disconnect the battery for at least 3 minutes F172 Ford Reference To check the normal curb idle speed reconnect the battery and the ISC air bypass solenoid Then start the engine and run it at 1800 rpm for 30 seconds Place an AT in drive place a MT in neutral Let the engine idle for 1 minute Refer to the VECI decal for curb idle specifications 7 5L V8 1988 and later Truck and Van P To adjust idle speed 1 2 3 4 Disconnect the ISC air bypass solenoid Start the engine and run it at 2500 rpm for 30 seconds Place the transmission in park or neutral Turn the throttle stop screw Figure F050 19 on page F172 to set the idle speed to 650 50 rpm for 1992 and earlier A
20. d from the driver seat Start the engine and let it idle for 2 minutes in park AT or neutral MT 10 With your foot on the brake to hold the vehicle shift an automatic transmission into drive leave a manual transmission in neutral Let the engine idle for 2 more minutes The ISC motor should then control the idle speed to the adaptive or learned speed as shown in the specifications In some cases it may be necessary to drive the vehicle for the processor to learn the new idle speed See Reference F002 for specification information on 1985 87 2 3L engines 11 Step lightly on the accelerator to increase engine speed above idle then release the accelerator The engine rom should return to the adaptive learned idle speed controlled by the EEC IV processor Apply the parking brake and turn the key OFF OOND 3 8L V6 CFI Engines Some 3 8L engines do not have a connector at the ISC motor For these engines turn the ignition off immediately after the ISC motor retracts during the self test mode and be sure to leave the ignition off during idle adjustment P To adjust idle speed 1 With the ISC motor retracted and disconnected if applicable back out the throttle stop screw until the throttle is closed and a 0 005 inch 0 13 mm gap exists between the screw tip and the throttle lever Figure F050 4 2 Then turn the screw back in 1 1 2 turns and seal the threads to prevent movement 3 Adjust the ISC motor by loosening the lock s
21. edures for all EFI engines 1 6L 4 Cylinder EFI and Turbo 1983 85 FWD P To adjust idle speed 1 Disconnect and plug both vacuum lines at the EGR valve vacuum regulator solenoid 2 Disconnect the ISC air bypass solenoid 3 Start the engine and run it at 2000 rpm for 60 seconds 4 Place the transmission in drive AT or neutral MT NOTE The engine cooling fan must be running during idle adjustment and adjustment must be completed within 2 minutes after returning to idle 5 Turn the throttle stop screw Figure F050 7 to adjust idle speed to 600 rpm MT 750 rpm AT 6 Stop the engine and reconnect all vacuum lines and electrical connectors ISC AIR BYPASS SOLENOID AND VALVE Figure F050 7 F156 Ford Reference 1 9L 4 Cylinder EFI 1986 91 FWD Be aware 1992 later SEFI idle speed is not adjustable P To adjust idle speed 1 ar oN On all SEFI engines and all 1991 and later models disconnect the battery for 5 minutes On 1986 87 models disconnect and plug both EGR valve vacuum solenoid lines Disconnect the ISC air bypass solenoid Start the engine and run it at 2000 rpm for 60 seconds Place an AT in drive 1986 or park 1987 and later Place a MT in neutral NOTE Adjustment must be completed within 2 minutes after returning to idle The engine cooling fan must be running during idle adjustment 1986 87 6 Turn the throttle stop screw Figure F050 8 to adjust idle speed to 800
22. eed 1 ar oN On 1991 and later models disconnect the battery for 5 minutes Disconnect the ISC air bypass solenoid Start the engine and run it at 2500 rpm for 30 seconds Place an AT in drive AT or park all 1991 and later and 1990 2 9L or MT in neutral Turn the throttle stop screw Figure F050 12 on page F162 to set the idle speed 700 25 rpm for 1986 and 1987 AT models 750 50 rpm for 1986 MT models 650 50 rpm for 1987 MT models 700 rpm for all 1988 models 725 25 rpm for all 1989 91 models except 4 0L 675 25 rpm for 1990 91 4 0L models 600 150 rpm for 1992 2 9L models F161 Ford Reference THROTTLE STOP SCREW ISC AIR BYPASS SOLENOID AND VALVE Figure F050 12 For 1988 and later models stop the engine then restart it and repeat steps 2 3 and 4 to verify the correct minimum idle speed Stop the engine and disconnect the battery for at least 5 minutes With the engine off reconnect the ISC air bypass solenoid Verify that the throttle is not stuck in the bore and that the linkage does not keep the throttle from closing Reconnect the battery and check the normal curb idle speed as follows a For 1986 87 models place the transmission in neutral and start the engine and run it at 2000 rpm for 20 seconds Let the engine idle for 2 minutes then raise the engine speed again to 2000 rpm for 20 seconds Let the engine idle for 1 minute and check the curb idle speed Refer
23. eference 3 8L Supercharged V6 1989 90 Thunderbird and Cougar NOTE For 1991 and later models use Scanner Idle Speed Adjust Functional Test P To adjust idle speed 1 Place the transmission in park AT or neutral MT 2 With the engine off back out the throttle stop screw so that it is not touching the throttle lever Then place a 0 010 inch feeler gauge between the throttle stop screw and the throttle lever 3 Tighten the throttle stop screw Figure F050 16 so that it touches the feeler gauge then turn it another 1 1 2 turns ISC AIR BYPASS SOLENOID AND VALVE Figure F050 16 4 Run the engine for 2 minutes 5 Snap accelerate and let engine return to idle Lightly depress and release the accelerator and let the engine idle Refer to the VECI decal for curb idle specifications 4 9L in line 6 Cylinder 1987 Truck and Van P To adjust idle speed 1 Disconnect the battery for 5 minutes to erase the current idle control program from ECA memory Turn the throttle stop screw in clockwise 1 turn 2 Reconnect the battery place the transmission in neutral or park and run the engine at 1800 rpm for 30 seconds 3 Place the transmission in drive AT or neutral MT and let idle speed stabilize NOTE Adjustment must be completed within 30 seconds after returning to idle 4 Back out the throttle stop screw Figure F050 17 on page F167 to adjust idle speed to 600 20 rpm AT or 700 20 MT Then
24. engine speed return to idle Lightly depress and release the accelerator and let the engine idle Curb idle speed should be 700 50 rpm For models with automatic overdrive AOD or AXOD transmission check the throttle valve TV cable adjustment 3 0L V6 SHO 1989 and later Taurus P To adjust idle speed 1 2 CANP CONNECTOR TOOL T89P 9600 AH OR EQUIVALENT On 1991 and later models disconnect the battery for 5 minutes Disconnect the SPOUT connector at the ignition module and verify that base timing is within 2 of specifications Refer to the VECI decal Leave the SPOUT connector disconnected until adjustment is finished Stop the engine and disconnect the PCV hose from the upper intake manifold and plug it Disconnect the canister purge CANP hose from the intake manifold and install Ford tool T89P 9600 AH or equivalent made from vacuum hose between CANP and PCV ports 1995 Only Shut off engine and install a 0 025 inch feeler gauge between throttle lever and return screw Disconnect the ISC air bypass solenoid Place the transmission in neutral start the engine and let idle speed stabilize Turn the throttle stop screw Figure F050 14 to set the idle speed to 800 30 rpm ISC AIR BYPASS SOLENOID AND VALVE THROTTLE STOP SCREW PCV CONNECTOR Figure F050 14 F164 Ford Reference NOTE Idle speed may change because of idle control program or strategy 9 10 11 12 13 14
25. gauge between the stop screw and the throttle lever Tighten the screw Figure F050 18 on page F170 so that it touches the feeler gauge Reconnect the battery start the engine and run it at idle for 2 minutes Adjust the curb idle to 675 25 rom Remove the feeler gauge With automatic overdrive AOD transmission check throttle valve TV cable adjustment 5 0L V8 HO 1995 Mustang P To adjust idle speed 1 2 3 Place the transmission in park AT or neutral MT Disconnect the battery for at least 5 minutes With the engine off insert a feeler gauge 0 050 AT or 0 030 MT between the throttle screw and the throttle lever Reconnect the battery start the engine and run it at idle for 2 minutes Adjust curb idle to 704 10 rpm for AT models 604 10 rpm for MT models 5 8L V8 1988 89 Truck and Van NOTE i For 1990 and later models under 8500 GVW and all 1992 models see Reference F053 for Scanner Idle Speed Adjust Functional Test Some 1990 and later models over 8500 GVW also may have Idle Speed Adjust Functional Test available If not use this procedure P To adjust idle speed 1 With the engine off place a 0 030 inch feeler gauge between the throttle stop screw and the throttle lever 0 050 inch for 1991 and later AT Disconnect the SPOUT connector at the ignition module and verify that base timing is within 2 of specifications Refer to the VECI decal Leave the SPOUT
26. gure FO50 11 tyre ee 4 Disconnect the ISC air bypass solenoid electrical connector E 5 Run the engine at 2000 rpm for 30 seconds 6 Slowly letthe engine return to idle and place the transmission in neutral 7 Setidle speed to 725 25 rpm by turning the throttle stop screw then tighten the locknut 8 When tightening the throttle camplate roller bolt be sure the throttle stop still contacts the throttle stop screw With the throttle open be sure there should not be excessive THROTTLE THROTTLE CAMPLATE lost motion in the throttle pedal ike ieee i Figure F050 11 9 Increase engine speed to 2000 rpm for about 30 seconds then let it return to idle Repeat this one more time to be sure the throttle plates move freely 10 Turn the engine off and reconnect the ISC air bypass solenoid electrical connector 11 Move the throttle plates and check to be sure that they are not sticking in the bores 12 Restart the engine and set the EATC to OFF or ECON 13 Increase engine speed to 2000 rpm for 1 1 2 seconds and release the throttle Place an AT in drive or a MT in neutral and let the engine idle for 3 minutes 14 Turn the EATC to ON and let the engine idle for another 3 minutes in drive or neutral 15 Place an AT in park and let the engine continue to idle for another 3 minutes NOTE See Reference F036 for related service information on 1988 89 models 2 9L V6 1986 92 Light Truck 4 0L V6 1986 91 Light Truck P To adjust idle sp
27. heck the idle speed 1 9L 625 25 rpm in drive AT or neutral MT If not within limits adjust the throttle stop screw Figure F050 2 Stop the engine and reconnect the ISC motor 2 3L HSC See reference F002 for information 2 5L HSC AT 1986 90 650 25 rpm in drive 2 5L HSC MT 1986 725 25 rpm in neutral 2 5L HSC MT 1987 90 700 25 rpm in neutral If not within limits continue with step 2 Also see reference F028 for related service information on 1986 87 models 2 Ifaplugis installed over the throttle stop screw shut the engine off and remove the throttle body from the engine 3 Remove the plug that covers the throttle stop screw Figure F050 3 4 Ifthe existing throttle stop screw is loose secure it with Loctite or replace it THROTTLE STOP SCREW IDLE SPEED CONTROL ISC HARNESS CONNECTOR IDLE SPEED CONTROL ISC HARNESS CONNECTOR THROTTLE STOP SCREW Figure F050 2 Figure F050 3 F153 Ford Reference 5 Reinstall the throttle body on the engine but do not connect the ISC motor Start the engine let it warm up to operating temperature Let the idle speed stabilize Adjust the throttle stop screw Figure F050 3 to the rom specified in step 1 Stop the engine and reconnect the ISC motor connector to the wiring harness Disconnect the battery for 10 minutes to erase the learned idle from EEC IV memory Reconnect the battery and the ISC motor Position a tachometer so it can be rea
28. ine 6 Cylinder 1987 Truck and Van on page F166 e 4 9L in line 6 Cylinder 1988 89 Truck and Van on page F167 e 5 0L V8 1985 Truck and Van on page F168 e 5 0L V8 1986 87 Truck and Van on page F168 e 5 0L V8 1988 and later Truck and Van on page F169 e 5 0L V8 1986 87 RWD Car on page F169 e 5 0L V8 1988 91 Car except 1991 and later HO Mustang Mark VII on page F170 e 5 0L V8 HO 1991 94 Mustang and Mark VII on page F170 e 5 0L V8 HO 1995 Mustang on page F171 e 5 8L V8 1988 89 Truck and Van on page F171 e 7 5L V8 1987 Truck and Van on page F172 e 7 5L V8 1988 and later Truck and Van on page F173 F151 Ford Reference MAZDA ELECTRONIC CONTROL SYSTEM MECS e 2 0L 4 Cylinder EFI Probe 1993 only on page F173 e 1 3L 4 Cylinder EFI Festiva 1 6L 4 Cylinder EFI Tracer 1 8L 4 Cylinder EFI Escort GT 2 0L 4 Cylinder EFI Probe Except 1993 2 2L 4 Cylinder EFI and Turbo Probe 2 5L 6 Cylinder EFI Probe on page F173 NOTE See Reference F053 or the Vehicle Communications Manual for additional instructions on using the Scanner to assist in idle adjustment on some 1990 and later engines See Reference F068 for spout connector locations Before minimum idle speed adjustment on port injection systems inspect the throttle body and idle speed control ISC air bypass valve for sludge or varnish buildup If sludge is present clean the valve in accordance with
29. inkage does not keep the throttle from closing F158 Ford Reference THROTTLE STOP SCREW ISC AIR BYPASS SOLENOID AND VALVE Figure F050 10 6 Check the normal curb idle speed as follows a For 1983 87 models start the engine and run it at 1500 rpm for 20 seconds Place an automatic transmission in drive Place a manual transmission in neutral Refer to the VECI decal for curb idle specifications b For 1988 and later models run the engine at idle for 2 minutes Then snap accelerate and let engine speed return to idle Lightly depress and release the accelerator and let the engine idle 2 3L 4 Cylinder OHC Non Turbo 1985 94 Light Truck P To adjust idle speed 1 On 1991 and later models disconnect the battery for 5 minutes 1994 Only Disconnect the SPOUT connector near the ignition module and verify that base timing is within 2 of specification Refer to the VECI decal Leave the SPOUT connector disconnected until adjustment is finished 2 Disconnect the ISC air bypass solenoid which is mounted on the air cleaner of 1985 88 models and on the throttle body of 1989 and later models 3 For 1989 and later models disconnect the SPOUT connector near the self test connector and verify that base timing is within 2 of specifications Refer to the VECI decal Leave the SPOUT connector disconnected until adjustment is finished 4 Run the engine at 2500 rpm for 30 seconds with the transmission in neutral or park
30. or using the Scanner 1 With the engine off remove the air cleaner 2 Select the KEY ON ENGINE OFF SELF TEST from the SERVICE CODES menu 3 Watch for the ISC motor to retract and turn the ignition key off immediately 4 Disconnect the ISC motor from the wire harness Some 3 8L engines do not have a connector at the ISC motor In these cases be sure to leave the ignition off during idle adjustment F152 Ford Reference P Retracting the ISC motor using the Scanner 1 With the engine off remove the air cleaner JUMPER Connect a jumper wire between the self test input connector and the signal return ground pin on the self test connector Figure FO50 1 2 Turn the ignition key to RUN but do not start the engine The ISC plunger will retractin10 SELF TEST CONNECTOR to 15 seconds If the plunger does not retract refer to a service manual and repair 3 Return the ignition key to OFF and wait 10 to 15 seconds then remove the jumper wire Disconnect the ISC motor from the wire harness Some 3 8L V6 engines do not have a connector at the ISC motor In these cases be sure to leave the ignition switched off during idle adjustment 4 Inspect the ISC wiring harness for exposed wires at the 4 wire connector Repair as necessary to prevent a short circuit SELF TEST INPUT STI Figure F050 1 4 Cylinder CFI Engines P To adjust idle speed 1 With the ISC motor retracted and disconnected start the engine and c
31. peat steps 4 5 and 6 to verify minimum idle speed Stop the engine and disconnect the battery for at least 5 minutes With the engine off reconnect the ISC air bypass solenoid On 1986 87 models reconnect the ignition SPOUT connector and the PCV hose to the valve Verify that the throttle is not stuck in the bore and that the linkage does not keep the throttle from closing Reconnect the battery and check the normal curb idle speed as follows a For 1986 87 models start the engine and run it at 2000 rpm for 20 seconds Let the engine idle for 2 minutes then raise the engine speed again to 2000 rpm for 20 seconds Let the engine idle for 1 minute and check the curb idle speed It should be 700 50 rpm in drive At or 800 50 rpm in neutral MT b For 1988 and later models run the engine for 2 minutes Then snap accelerate and let engine speed return to idle Lightly depress and release the accelerator and let the engine idle Curb idle speed should be 700 50 rpm pre 1990 AT 720 50 1990 AT or 800 50 rpm MT See VECI label to confirm specification 3 0L V6 1986 90 Car except Taurus SHO NOTE For 1991 and later use Idle Speed Adjust Functional Test See Reference F053 P To adjust idle speed 1 va GO Disconnect the SPOUT connector at the ignition module and verify that base timing is within 2 of specifications Refer to the VECI decal Leave the SPOUT disconnected Remove the PCV hose at the PCV v
32. pm for 1990 AT models 700 25 rpm for 1990 MT models NOTE If the screw must be turned in stop the engine Make an estimated adjustment start the engine and repeat steps 4 and 5 before continuing F167 Ford Reference 6 Stop the engine and disconnect the battery for at least 5 minutes 7 Remove the feeler gauge from the throttle stop screw and reconnect the ISC air bypass solenoid Reconnect the ignition SPOUT connector Verify that the throttle is not stuck in the bore and that the linkage does not keep the throttle from closing Start the engine and let the idle speed stabilize Then snap accelerate and let engine speed return to idle Lightly depress and release the accelerator and let the engine idle Refer to the VECI decal for curb idle specifications NOTE If idle speed oscillates or is erratic the throttle plates may be open far enough to allow canister purge flow To verify disconnect and plug the canister purge hose Idle speed should stabilize If purge is present at idle the throttle plates must be closed until the rough idle stops 9 For automatic overdrive AOD transmission check throttle valve TV cable adjustment 5 0L V8 1985 Truck and Van P To adjust idle speed T Disconnect the battery for 3 minutes to erase the current idle control program from ECA memory Turn the throttle stop screw in clockwise 1 turn Reconnect the battery start the engine and run it at 1800 rpm for 30 seconds
33. sconnected until adjustment is finished 3 Stop the engine and remove the PCV hose at the PCV valve and install a 0 200 inch diameter orifice in the hose Ford tool T86P 9600 A or equivalent Disconnect the ISC air bypass solenoid Start the engine and run it at 2500 rpm for 30 seconds Place the transmission in drive AT or neutral MT Turn the throttle stop screw Figure FO50 10 on page F159 to set idle speed to 1025 50 rpm for 1990 and earlier AT models 1550 50 rpm for 1990 and earlier MT models 950 25 rpm for 1991 AT models 1550 25 rpm for 1991 MT models 8 Stop the engine and reconnect the ignition SPOUT connector and the ISC air bypass solenoid Remove the orifice from the PCV hose and reconnect the hose to the valve 9 Verify the throttle is not stuck in the bore and the linkage does not prevent throttle closing 10 Run the engine at idle for 2 minutes Then snap accelerate and let engine speed return to idle Lightly depress and release the accelerator and let the engine idle Refer to the VECI decal for curb idle specifications N Oo 2 9L V6 1986 89 Scorpio P To adjust idle speed 1 Set electronic automatic temperature control EATC air conditioner to ECON or OFF 2 Remove the tamper proof cap from the throttle stop screw and throw it away Then loosen the locknut on the throttle stop screw F160 Ford Reference 3 Loosen the throttle camplate roller bolt THROTTLE Fi
34. ual transmission in neutral Let engine idle 1 minute Refer to VECI decal for curb idle specs 5 0L V8 1988 and later Truck and Van NOTE i For 1991 and later models use Scanner Idle Speed Adjust Functional Test P To adjust idle speed T For 1995 skip this step With the engine off place a 0 050 inch feeler gauge AT or a 0 030 inch feeler gauge MT between the throttle stop screw and the throttle lever 2 Disconnect the SPOUT connector near the ignition module and verify that base timing is within 2 of specifications Refer to the VECI decal Leave the SPOUT connector disconnected until adjustment is finished 3 Disconnect the ISC air bypass solenoid Figure F050 17 on page F167 4 Place the transmission in neutral or park Start the engine and let it idle for 2 minutes 5 With the transmission in park or neutral turn the throttle stop screw Figure F050 17 on page F167 to set the idle speed to 675 50 rpm for AT or 700 50 rpm for MT NOTE If the screw must be turned in stop the engine Make an estimated adjustment start the engine and repeat steps 4 and 5 before continuing 6 Stop the engine and disconnect the battery for at least 5 minutes 7 Remove the feeler gauge from the throttle stop screw and reconnect the ISC air bypass solenoid Reconnect the ignition SPOUT connector Verify that the throttle is not stuck in the bore and that the linkage does not keep the throttle from closing 8 St

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