5 Symptoms of a Bad Idle Air Control Valve in Your Car


3. Rough Idling – A normal healthy idle air control valve will provide smooth idling in your vehicle. But if the valve goes bad for any reason, the idling will go from smooth to rough. A rough idle will result in intense vibrations forming whenever your vehicle is stopped with the engine running. Since less air will be going into the engine during its idle state, the car will react by shaking profusely.

4. Engine Stalling – If you experience engine stalling from a bad idle air control valve, then you won’t be able to drive your vehicle at all. As soon as you start your car, the idle air control valve will immediately malfunction. If you happen to be away from home and this happens, the stalling will happen every couple of minutes in the beginning. You should be able to make it to the nearest mechanic in time before the engine stalls completely.

5. Load Causes Stalling – Sometimes the engine stalling will happen on its own while other times, increasing the load on the engine will cause it to stall. For example, if you turn on your heater or air conditioner when you have a bad idle air control valve, then your engine will probably stall immediately afterward. The steering wheel might also feel like it’s being dragged to one side too. To temporarily fix this problem, just turn off your heater or air conditioner to reduce the load. Then let the engine cool for a couple of minutes.

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  1. Victor Fowler 2 February, 2019 at 15:06 Reply

    It’s exactly what this article addresses, cars may be different in many ways but they all still work on the same basic principals. Replacing the IAC valve is easy and if your not sure simply go on YouTube and you’re sure to find someone who has made an instructional video on how to do it. It’s how I just replaced the clutch in my car, and successfully to I might add without ever having done one before. All for less than 1/10th of what a shop would have charged me thanks to ebay where I got the entire O.E.M. clutch kit FOR $60. So order that part and retrive the knowledge you will need and as a by-product of such your accomplishment will garner you some confidence, and good luck to you sir.

  2. bennie 13 February, 2019 at 21:22 Reply

    my 01 ford focus 2.0 I can undo the battery and re kook it to make the iac valve work but after about 20 miles it dose it aging could the iac valve have a short in it

    • Roro 11 March, 2019 at 06:59 Reply

      I have a 2003 Ford Ranger and this happens to me too. My idle will randomly get low, and get to below 500 like the engine will stall. So I turn engine off and unhook the neg. battery cable & re-hook it, then restart and do idle relearn procedure…and it idles good again. But then after a few hundred miles it will start to idle low again. I replaced my IAC valve 20,000 miles ago w/ OEM Motorcraft. Maybe my truck would do better with an aftermarket IAC valve…I’m so confused about this issue. Any advice appreciated.

  3. JOSE MANUEL VEGA 19 February, 2019 at 23:51 Reply

    I have a Toyota Sienna 2001. I would like to know why or how IAC valve affects the brake booster in my car. I had the booster replaced two weeks ago, but the brake pedal seems to get hard and doesn’t brake correctly. Thank you for your help.

  4. Chrystie Galbari 7 March, 2019 at 01:38 Reply

    I had a bad AIC valve. I changed it & not the car will not start at all! What could be the problem

  5. alec 11 March, 2019 at 23:48 Reply

    I have a 2012 ford escape and at idle my car almost stalled, rpm went way below 500, but then picked back up. I think it is spark plugs needs to be changes but could it be AIC valve?

  6. Bulisa 17 April, 2019 at 15:53 Reply

    Hi my vw tenacity 1,4i the car doesnt move whn it is cold if i try to rev t it gives me a low idle till the tempreture rises service is up to date wht could be the problem

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