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Thread: lq4 idling high

  1. #11
    Join Date
    Jan 2012
    Posts
    229
    Just got up with a mechanic buddy of mine. We gonna put smoke to it. Maybe i can find it then

  2. #12
    Join Date
    Jan 2012
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    229
    I had it tuned for lt headers. Due to budget cuts im running stoxk exhast manifolds. Could this cause my issues

  3. #13
    Join Date
    Jan 2012
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    229
    Just put smoke to it. No vacuum leaks. Any other ideas

  4. #14
    Join Date
    Jul 2008
    Location
    Mesa, AZ
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    5,979
    Maybe there is a crack in the intake?
    T-RAV
    99 GMC | 5.3 | Skinny White Guy Tuned

  5. #15
    Join Date
    Jan 2012
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    229
    I put smoke in the entire intake. After 10 min of smoking it out no leaks.

  6. #16
    Did you try to clean your IAC?http://www.justanswer.com/uploads/mc...eplace-IAC.pdf
    (not sure if it's the same TB you have but you should look at this.)
    Sorry for my bad English I'm french!

  7. #17
    Join Date
    Dec 2010
    Posts
    181
    Do you know what the tune is commanding for idle, and also if the air vol minimums are set for your engine? If its looking for higher air volume it won't go down to the commanded idle.

    If you're not leaking on the intake side, I'm forced to assume its doing what the tune is commanding.

  8. #18
    Join Date
    Jan 2012
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    229
    The tb i bought had new tps and iac sensors

  9. #19
    Join Date
    Jan 2012
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    229
    Quote Originally Posted by Wagonbacker9 View Post
    Do you know what the tune is commanding for idle, and also if the air vol minimums are set for your engine? If its looking for higher air volume it won't go down to the commanded idle.
    If you're not leaking on the intake side, I'm forced to assume its doing what the tune is commanding.
    I thinking the same thing. I dont know what else to try

  10. #20
    Quote Originally Posted by cottontop11 View Post
    The tb i bought had new tps and iac sensors
    Sorry I read too fast...if is not the IAC or a vacuum leak that look bad that the problem is in the tune.Did you hook it to a live data scanner to see how is your STFT?This info will probably help someone with better knowledge than me to help you.Good luck!
    Sorry for my bad English I'm french!

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