What’s An Idle Air Control Valve?Īn idle air control valve, also known as an idle air control actuator, is usually used in fuel-injected vehicles. Here are answers to some common IAC valve-related queries: 1. Car starts, then dies : If the valve only works in certain parts of its cycle, the engine might start briefly before it dies due to lack of air.As a result, the excess fuel in the system could cause a backfire. Backfiring : When the engine doesn’t get enough air, the air-fuel ratio will run rich.Engine stalling: Anything like turning on the AC or a change in elevation could cause your engine to stall if the idle air control valve can’t adjust to different driving conditions.Sometimes vacuum leaks could also cause an elevated idle RPM. In case of a bad valve, the RPM could go high above 1,100 RPM or below 700 RPM, or keep fluctuating. Fluctuating idle speed: The idle control valve manages your engine’s RPM rate to maintain idle speed.Trouble starting: If your engine doesn’t get enough air due to a stuck or faulty idle air control valve, you’ll have difficulty starting your engine.You’ll need an OBD-II scan tool to check if the light is illuminated due to a faulty IAC valve. An illuminated Check Engine Light: The Engine Control Module (ECM) will activate the Check Engine Light if the valve malfunctions.Here are some signs that could give you a heads up about a faulty idle control valve: In that case, it’s best to have a mechanic inspect your IAC valve to ascertain if that’s what is causing these symptoms. But, these symptoms may also show up due to other engine troubles.
Several signs could indicate a bad idle control valve.
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