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Extremly extremly high idle, wth??

This is a discussion on Extremly extremly high idle, wth?? within the General Help forums, part of the LSx Technical Help Section category; Originally Posted by 0rion vacuum leak or an air leak post MAF. First place to check is the pcv hose ...

  1. #21
    Veteran 0rion's Avatar
    Join Date
    Aug 2005

    98 Formula
    06 duramax

    Quote Originally Posted by 0rion View Post
    vacuum leak or an air leak post MAF. First place to check is the pcv hose that goes into the side of the intake....check the back of that bend and see if it's cracked. Make sure your intake tract is sealed up. You can then start checking all other vacuum lines for leaks and around your intake for leaks. Either spray with carb cleaner or use propane which is safer although I've used carb cleaner numerous times and have never burst into flames. Good luck......

  2. #22
    Spaz is My Mentor SMWS6TA's Avatar
    Join Date
    Feb 2009
    Ugy Lower Corner of AL

    Navy Blue Metallic
    98 T/A w/a little mods...

    IAC is Idle Air Control - located on the throttle body. As the TB sits on the engine, it is the top sensor on the drivers side of the TB. The lower sensor is the Throttle Position Sensor or TPS.

    Another thing to check with the TB is check the blade. If the hole has been enlarged it can cause high idle too.

    Orion is more likely to be correct. The pcv is notorious for leaking and if the intake was not installed correctly or the map sensor (located on the back) was knocked off you'll have issues.

    Also check behind the intake, make sure the hose that goes to the break booster and the HVAC tubes are seated correctly.

  3. #23
    Junior Member
    Join Date
    Nov 2011
    Houston, TX

    1999 LS1 Transam

    ok thanks much appreicated ill let you know what i find ouit

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