Similar to the auxiliary air valve, the idle control valve control valve adjusts and maintains the proper idle for the car whether it's cold or hot. Based on temperature sensors in the engine, the valve opens automatically to allow more airflow into the engine while cold, essentially like a choke on an old carburetor, keeping the engine supplied with more air until it reaches a certain temperature. If the unit goes bad, it can cause rich running, idle fluctuation and hard starting.
There are a variety of control units through out your car; they utilize various electronic signals to control certain operations of the vehicle. Pelican offers a wide selection of engine control units.
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