Auxiliary Air Valve (Idle Speed): Description and Operation

Auxiliary Air Valve:

PURPOSE
The auxiliary air valve 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.

LOCATION
Located on the underside of the throttle body.

OPERATION
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.