An idle air control valve is found on most fuel injected engines without electronic throttle bodies. This video explains what the idle air control valve does.. The IAC actuator is an electrically controlled device, which gets its input from the vehicle's engine control unit (ECU). The actuator is fitted such that it either bypasses the throttle or operates the throttle butterfly valve directly. The actuator consists of a linear servo actuator servomotor that controls a plunger which varies air flow.
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Located on the throttle body of fuel-injected engines, the idle air control valve or IAC valve works with the vehicle's ECU to electrically regulate airflow.. The most common symptoms of a bad idle control valve are rough idle and a check engine light on your dashboard. You may also notice fluctuating idle speed or a stalling engine on idle when your IAC valve is bad. Here is a more detailed list of the signs of a bad or failing idle air control valve (IAC) to look for: 1. Check Engine Light.
