Hot Idle Compensator (Non Comp. Controlled): Description and Operation

Hot Temperatures:

Extended idling, heavy loads and high speed operation cause an increase in engine compartment temperature. Under these conditions, fuel vaporizes in the carburetor float bowl and enters the intake manifold, creating a rich condition. This results in rough idle and increased CO emissions. The hot idle compensator valve responds to the increase in engine compartment temperature by opening to allow fresh air into the intake manifold to lean out the air/fuel mixture.