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How do i know if the iac valve is bad - 1998 Chevrolet Blazer

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Disconnect the iacv and if the idling performance doesn't change from what you are experiencing then it may not be turning or the passageways are clogged and need to be sprayed out with cleaner.

One can test the continuity of the iacv to see if it is within specifications using a multimeter.

One can turn the a/c on and if the car stalls, then the iacv may not be working.

Good luck on this diagnosis.

Posted on Jan 01, 2011


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How do you know if your ecm is bad?

most likely the IAC valve is bad , which damaged the ECM also. Have replaced couple of ECMs for this code in 2003 pathfinder. P0507 is an ICS code , which is linked to faulty IAC valve., but the ECM is an issue also, most likely. Find ECM on ebay. and replace the IAC valve with new one.
Wait one minute, your model pathfinder also has giant recall for strut towers rotting out, so have your local dealer check your VIN for the campaign. if the car is rotted beyond repair in certain areas by the struts, Nissan will buy the car back and give you money for it. Check the vin with your local dealer.

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What is an IAC Valve

Google is your friend in such questions.

  • Idle air control actuator - Wikipedia, the free encyclopedia An idle air control actuator or idle air control valve (IAC actuator/valve) ... Idle air control actuator; MAP sensor; Mass flow sensor; Oxygen sensor; Starter motor;
  • how to tell if your iac valve is going bad - YouTube
    • BY TIMMY102345
    • 6 MIN
    2009-09-07 · Video embedded · how to tell if your iac valve is going bad timmy102345. ... #372 Better repair method Toyota Camry Idle Air Control Valve - ...
  • 4 Ways to Check an Idle Air Control Valve - wikiHow
    2015-12-11 · How to Check an Idle Air Control Valve. ... Again, an idle air control valve can have an issue or fault without triggering a check engine light. 2.

  • There are also videos in this link. How to check and fix.

  • What is an IAC Valve Bing video

    May 12, 2016 | 1992 Toyota Paseo

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    Where do the iac sensor is on the engine of a 2.7 Toyota quitim petrol

    John, IAC normally connected on throttle body, could be on under side. Check the attached links,instruction and guides, Good luck
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    2002 ford explorer 4.0 xls, shuts off when coming to a stop and also when switchin from drive to reverse. the engine also smokes at the exhaust manifold I'm guessing

    Sounds like a possible idle air control problem (IAC) The smoke probably has nothing to do with the idle problem. Possible valve cover leak??

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    Need to fix p1504 code on lincoln zs v8 2001

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    Aug 05, 2011 | Lincoln LS Cars & Trucks

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    Idles high what can i do.

    Get the IAC valve checked.Remove the Iac valve from the throttle body. It is on the side facing the front higher than the tps sensor. It has a 4 wire connector. Make sure this is clean. If it is dirty/dusty then clean it. This valve controls the idle speed. After cleaning it turn the ignition on with the engine off. The Iac should move in and out to find the stops. If it does not move you have either bad wiring, Iac or pcm. Most likely is Iac.
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    Nov 13, 2010 | 2000 Cadillac DeVille

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    Whats will my car do if the idle air control valve goes bad

    The engine will idle very rough or it will die at idle.

    A simple way to test, try removing the IAC valve completely from the intake manifold, leaving an exposed opening to let air in the manifold. If the engine idles ok with the IAC removed, you'll know it's a problem related to the IAC. You will need further testing to determine if the problem is with the IAC valve itself or with its circuit.

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    Where is idile valve air control sensor located on the 1998 beetle

    Hi there,

    Well please follow the below link to check out the position of idle valve -

    The Idle Air Control (IAC) valve controls the engine idle speed and dashpot functions. The valve is located on the side of the throttle body. This valve allows the necessary amount of air, as determined by the Powertrain Control Module (PCM) and controlled by a duty cycle signal, to bypass the throttle plate in order to maintain the proper idle speed.

    Turn the ignition switch to the OFF position.
    Disengage the wiring harness connector from the IAC valve .
    Using an ohmmeter, measure the resistance between the terminals of the valve.

    NOTE: Due to the diode in the solenoid, place the ohmmeter positive lead on the VPWR terminal and the negative lead on the ISC terminal.
    If the resistance is not 7–13 ohms, replace the IAC valve.

    The following symptoms can be caused by a faulty IAC due to loose connections, bad grounds, high resistance in the circuit, or opens in the circuit.
    Disconnect the negative battery cable.
    Disengage the wiring harness connector from the IAC valve.
    Remove the two retaining screws, then remove the IAC valve and discard the old gasket.

    To install:
    Clean the IAC valve mounting surface on the throttle body of old gasket material.
    Using a new gasket, position the IAC valve on the throttle body. Install and tighten the retaining screws to 71–106 inch lbs. (8–12 Nm).
    Attach the wiring harness connector to the IAC valve.
    Connect the negative battery cable.

    Good Luck!!


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    I need to know where the idle adjustment screw is on a 92 Saturn SL1 and what wrench to use.

    its located on the throttle body connected to your air intake manifold where your throttle cable connects on the throttle body there is a adjustment screw connected there

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    Ac problem

    Possible base idle adjustment or bad IAC valve. Could also be the A/C circuit. Check to see if the cars idle goes up when you are still and at idle. The idle should come up some, maybe about 150 rpm's or so. If that's OK, that I would have your base idle checked along with the IAC valve circuit and the valve itself. Let me know wht you find.

    Aug 27, 2008 | 1993 Nissan Sentra 4 Door

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