Question about 2002 GMC Envoy

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DOES THE 2002 GMC ENVOY HAS AN IDOL AIR CONTROL SENSOR?

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  • dartman340 Jul 07, 2010

    no, but what is the problem

  • carneycac Jul 07, 2010

    MY IDLE GOES UP THEN DROPS.

  • carneycac Jul 07, 2010

    MY CAR IDLE GOES UP HIGH THEN IT DROPS. DO YOU THINK I NEED AN IDLE AIR CONTROL VALVE? OR WHAT PART DO YOU THINK I CAN TRY. I ALREADY TRIED ADJUSTING THE IDLE OF THE CAR.DO YOU THINK I NEED AN IDLE AIR CONTROL VALVE? OR WHAT CAN I TRY PLEASE?

  • carneycac Jul 07, 2010

    MY CAR IDLE GOES UP HIGH THEN DROPS. DO I NEED AN IDLE AIR CONTROL VALVE? OR WHAT CAN I DO?

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It may need cleaned, they get carboned up as do the throttle plates inside the throttle body. use carb cleaner and a soft rag to wipe clean. do not use a wire brush. also check for vacuum leaks, spray carb clean around manifold an see if idle changes

Posted on Jul 07, 2010

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There is no such thing as an "idle air control sensor". There is an idle air control valve (IAC), which controls idle speed by allowing more/less air into the intake. The position of the IAC pintle is determined by the computer as it receives data from a variety of sensors. These include engine speed (rpm), engine load (map), air flow (maf), amount of throttle opening (tps), air temperature, coolant temperature sendor (cts), a/c command (on or off), cooling fan command (on or off), transmission gear selection, and more. All of these are inputs to the computer (aka ECM, electronic control module) which analyze the data and adjust the idle air control valve accordingly. I hope this gives you a general idea of how idle speed is controlled.

If you find this solution to be helpful, then please take a moment to rate this post. - Thanks.

Posted on Jul 07, 2010

  • olwork
    olwork Jul 07, 2010

    If the idle is up & down then the IAC motor is working but the problem is most often a vacuum leak. Get a can of Berryman's B12 carb cleaner, attach the spray tube and with very short blasts spray along all vacuum lines, vacuum line connectors, throttle body gaskets & clamps, and intake manifold. If you hit a spot that spraying a small blast of cleaner consistently creates a change in RPM then you have found the vacuum leak. Do not spray ignition components, such as spark plugs, spark wires, module, etc. Be careful, be thorough, and be patient. You'll find the leak.

  • Gregory Layne Feb 22, 2013

    Was it doing it when you have the defrost/fan on?

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