Control of Fast Idle For Cold Engine Operation

Air Regulator:

PURPOSE
Provides fast idle when the engine is cold.

OPERATION
The intake collector mounted air regulator is used to provide a cold fast idle. Cooling system fluid circulates through the air regulator, warming a wax pellet. When coolant temperature is low, opposing spring pressure forces the piston back. With the piston retracted air is allowed to bypass the throttle plate to achieve a faster cold idle. As coolant temperature rises the was begins to expand, closing the bypass passage and returning the idle to normal curb speed.