Auxiliary Air Valve (Idle Speed): Description and Operation

Idle Air Control Valve-Air Regulator:

PURPOSE
The air regulator allows air to bypass the throttle plate when the engine is cold providing fast idle.

LOCATION
On the intake plenum

OPERATION
When the engine is cold a passage in the regulator is open to allow air to by-pass the throttle plate allowing fast idle. The regulator has a bi-metal heater and rotary shutter that closes the passage as the heater element warms. The element is controlled by the ECM via the fuel pump relay.