secondary air system
Contents
1. OE quality you can trust AN PIERBURG i Technology in focus Secondary Air Systems The secondary air system is key to emission control and significantly reduces the emission of harmful gases By blowing oxygen rich secondary air into the exhaust gas a post oxidation process occurs considerably reducing hydrocarbon HC and carbon monoxide CO emissions Technology in Focus explains more Key Products The secondary air system is made up of two key components the secondary air pump and secondary air valve Secondary Air Pumps The secondary air pump provides the fresh or secondary air that enables the post oxidation process The pump is sealed off from the engine compartment in order to protect the motor from the corrosive effects of exhaust gas condensate Secondary Air Valves The secondary air valve combines the function of a non return and shut off valve preventing backflow of exhaust gases into the pump It also prevents air from entering the exhaust manifold after the cold start phase Troubleshooting and Diagnostics Points to note when servicing the secondary air system e European on board diagnostics EOBD only checks the electrical connection of the pump not its effect therefore a fault may only be detected by unusual whistling or varying idle speed in the cold running phase e Most faults with the pump are caused by exhaust gas condensate as the valve is designed to prevent thi2. s it also needs to be checked and replaced if necessary e To check the valve a finger test will reveal a fault simply loosen the connecting hose and wipe through the opening Links with one finger If there are deposits present the valve and pump should both be replaced Click on the links below to find out more Range Coverage The Pierburg range has 30 secondary air pumps and over 20 Part Info secondary air valves Contact Us Pierburg is the leading European manufacturer of secondary air systems and the range is available through your local motor factor
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