Idle Enrichment System: Description

Idle Enrichment System is designed to reduce cold engine stalling, by use of a metering system related to the basic carburetor instead of the choke. It is used on some vehicles with automatic transmissions and Light Duty Emissions.

System enriches carburetor mixtures in curb idle and fast idle area during cold or semi-cold operation. It consists of a vacuum idle enrichment valve and a coolant vacuum switch (or a solenoid vacuum switch and electric timer combination).