An idle air control valve, also called an idle air sensor control motor, is an electrically operated valve that controls the amount of air that bypasses the throttle plate in cars with a fuel injection system [source: Autozone]. This causes the idling speed of the engine to change as needed.Click to see full answer. Keeping this in view, what happens when the idle air control valve goes bad?One of the most common symptoms associated with a problematic idle air control valve is irregular idle speed. If the valve fails or has any issues it can cause the idle speed to be thrown off. This may result in an unusually high or low idle speed, or in some cases a surging idle speed that repeatedly climbs and falls. how does an idle air control motor work? An idle air control valve literally bypasses air around a closed throttle plate so the engine can get air at idle. Because it bypasses air, it’s also called an air bypass valve. That allowed more air to pass, create more suction, and move more gas into the cold engine. Simply so, what are the symptoms of a bad idle air control? Bad Idle Air Control Valve Symptoms 1) Intermittent Idle Speed. Since the idle air control valve is supposed to manage the idle speed of the engine, a bad valve will certainly throw that out of whack. 2) Check Engine Warning Light. 3) Rough Idling. 4) Engine Stalling. 5) Load Causes Stalling. How do I reset my idle air control valve? Reset the IAC valve pintle position by performing the following: Depress the accelerator pedal slightly. Start the engine and run for 5 seconds. Turn the ignition switch to the OFF position for 10 seconds. Restart the engine and check for proper idle operation.
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