But if the valve goes bad for any reason, the idling will go from smooth to rough.Ī rough idle will result in intense vibrations forming whenever your vehicle is stopped with the engine running. 3) Rough IdlingĪ normal healthy idle air control valve will provide smooth idling in your vehicle. In any case, you should take your vehicle to the auto shop to get it checked out at once.

Of course, there could be a whole list of other reasons for the warning light to come on too. If the number of revolutions per minute seems peculiar to the engine control unit, it will let you know by activating the warning light. A bad idle air control valve could certainly be one reason for this to happen. Whenever there is the smallest problem or issue with anything connected to the engine, it will cause the central computer to activate the check engine warning light on the dashboard. You will clearly notice this idle speed changing by simply looking at the tachometer on the dashboard. The idle speed may be too high at one moment and then too low at other moments. It will cause the idle speed to randomly fluctuate to different speeds rather than stay at one constant 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. See Also: Bad Throttle Position Sensor Symptoms 1) Intermittent Idle Speed If you don’t get the valve replaced immediately, your car will become undriveable.īelow are the top 5 symptoms of a bad idle air control valve which you will easily notice. When you have a bad idle air control valve in your car, there are several problems and symptoms that will present themselves. Related: How to Test and Clean an Idle Air Control Valve Bad Idle Air Control Valve Symptoms That way, the valve will regulate the engine RPM properly based on the information relayed from the computer. When this central computer receives information about the temperature and load of the engine, it uses this information to make the proper adjustments to the idle air control valve. The engine control unit is responsible for managing the idle air control valve.

This will allow the engine to handle the heavier load or cool down in each case. The current operating conditions of your vehicle will cause the idle air control valve to either increase or decrease the RPM in your engine.įor instance, if your vehicle has a heavy load or it is heating up too quickly, then the idle air control valve will adjust the RPM by increasing or decreasing it respectively. Idle Air Control Valve Replacement CostĮngine speed refers to the number of revolutions it makes per minute.

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