Auxiliary Air Valve (Idle Speed): Description and Operation

As a mechanism to raise idle speed during cold, fast idle conditions, the air regulator controls air flow through a hose that bypasses the throttle valve. The regulator contains a temperature sensitive electric element that causes the air bypass to close gradually as the engine warms up. When the engine has run for approximately five minutes, the valve should be fully closed.

Air Regulator Operating Graph:

The air regulator is energized through the fuel pump relay and not directly controlled by the ECM.