![]() In most cases, it is located near the throttle body of the intake manifold. Most idle air control valves come in the form of a motor or a motorized valve and are mounted on the intake manifold. Back in the days when carburetors were used for mixing and passing the air-fuel mixture to the intake manifold, idle speed was controlled using an idle speed screw. It has the unit as revolutions per minute/revs per minute/RPM. The idling rotation speed of the engine is how fast the engine runs when the car stays still. In any car, an idle air control (IAC) valve or more commonly known as an idle air control actuator is a small device that controls the idling rotational speed of the engine. The IAC adjusts the amount of air allowed into the intake during idle to regulate the engine speed. ![]() Idle Air Control Valve: What Does It Do?įirst, you need to have a basic understanding of the role the idle air control valve plays in your vehicle and how does an idle control valve work. Read on to learn the most common bad idle air control valve symptoms, how to troubleshoot, as well as important maintenance tips to restore a dirty IAC valve to proper working condition. Needless to say, while the engine requires an optimal among of air and fuel to function efficiently, a faulty idle air control valve can throw the air supply off and adversely affect the engine’s performance. ![]() The idle air control (IAC) valve manages the idle speed of your engine by controlling the amount of air which flows into the engine.
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