Idle Air Control (IAC) System

IAC system consists of electrically controlled motor (actuator) which positions IAC valve in air by-pass channel around throttle valve. IAC valve is threaded into throttle body casting. ECM calculates desired position of IAC valve based upon battery voltage, coolant temperature, engine load and engine speed, to control idle speed and prevent stalls due to engine load changes.

There are 3 different conical IAC pintle designs used. Ensure that correct design and type is used if replacement is made.