![]() Install the IAC valve attaching screws, and tighten to 3.0 Nm (27 in lb).ĥ. Lubricate the IAC valve O-ring with clean engine oil.Ĥ. The force required to retract the pintle of a new valve will not cause damage to the valve.Ģ. If greater than 28 mm, use finger pressure to slowly retract the pintle. If installing a new IAC valve, measure the distance between the tip of the pintle and the mounting flange. IAC valve pintle shape and diameter are designed for specific application.ġ. NOTE: If installing a new IAC valve, be sure to replace with an identical part. Inspect the IAC valve O-ring for cuts, cracks or distortion. If the air passage has heavy deposits, remove the throttle body for complete cleaning. Shiny spots on the pintle or seat are normal, and do not indicate misalignment or a bent pintle shaft. It is an extremely strong solvent, and not necessary for this type of deposit. DO NOT use a cleaner that contains Methyl Ethyl Ketone. Use carburetor cleaner and a parts cleaning brush to remove carbon deposits. Clean the IAC valve O-ring sealing surface, pintle valve, seat and air passage. The force required to move the pintle may damage the threads on the worm drive.Ĥ. Remove the IAC valve attaching screws.ĬAUTION: On IAC valves that have been in service, DO NOT push or pull on the old IAC valve pintle. Disconnect the idle air control (IAC) valve electrical connector.Ģ. Let me know if you have any other questions.ġ. I attached pictures and the procedure for you for the replacement. Install the new idle air control valve with a new gasket.The IAC is on the throttle body.Remove the old gasket and ensure that no gunk is left behind.Unplug the valve’s electrical connector.Remove any other parts that come in the way of accessing the valve.Once the engine is cooled down, open the hood and locate the idle air control valve.Here’s how a mechanic will replace an idle control valve: If you’re not sure, it’s best to have a certified technician do the replacement for you. While replacing an idle air control valve is relatively easy, you still need to know your car parts well. How To Perform An Idle Air Control Valve Replacement? Failing IAC valve: The solenoid inside the valve could fail and not send a signal to your vehicle’s ECM.Clogged IAC valve: Over time, contaminants could enter the valve chamber and clog or jam its internal parts.Some of the common reasons for its failure are: While an IAC valve has a reasonably long life, it could malfunction prematurely. Most modern cars today have the valve integrated into the throttle body. The intake manifold is the engine part that supplies the air-fuel mixture to the cylinders. The idle control valve is usually located on the intake manifold near the back of the throttle body. This lets you move your car from an idle position by simply releasing the clutch or brake. Your vehicle’s Engine Control Module digitally monitors the idle control valve to maintain the required idling RPM irrespective of the driving conditions or engine load. Essentially, the valve acts as a bypass of the throttle body plate. Its role is to control the airflow needed in the combustion engine to maintain a steady idle speed. 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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