Auxiliary Air Valve (Idle Speed): Description and Operation

Auxiliary Air Valve:

The Auxiliary Air Valve, located on the underside of the Throttle Body, provides additional intake air around the throttle valve when the engine is cold. This raises the engine idle speed until the engine can idle normally on its own. The Air Valve has a thermo wax sensor that stays in contact with engine coolant and blocks off the bypass air passage as coolant temperature rises to normal operating temperature.