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bad idle

This is a discussion on bad idle within the General Help forums, part of the LSx Technical Help Section category; guys here the problem i am having a bad idle problem.sometime it surges up and down out off controle and ...

  1. #1
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    1998 z28

    bad idle

    guys here the problem i am having a bad idle problem.sometime it surges up and down out off controle and stals the engine ,and sometime it goes up to 1800 and stays there for as long as i dont stop for a few second.what gives dose any on had this problem and how did you fix it.

  2. #2
    Member tpilews's Avatar
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    MAF? Get some throttle body cleaner and go to town.

  3. #3
    Member jamessr's Avatar
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    ^ this

  4. #4
    Veteran 0rion's Avatar
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    06 duramax

    sounds like it could possibly be a vacuum leak. Check the pcv hose where it bends to go into the intake on the passenger side. Those like to crack on the back side of that hose in the bend.

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    i will check that thanks

  6. #6
    Smiles for 9.5 Years cammed goat's Avatar
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    Clean the MAF, check for vacuum leaks and clean your IAC and throttlebody. I cleaned my IAC and throttlebody a few days ago and my car idles smooth and feels better under acceleration. Keep us posted.

  7. #7
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    Navy Blue Metallic
    2002 Camaro Z28

    I have a similar problem

  8. #8
    Moderator 35th-ANV-SS's Avatar
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    I'm with Orion on this one. Is the SES light on?

  9. #9
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    no light on the problem comes and goes . i just clean the trottle and the iac the problem still persist .i check the trottle position sensor and the range is not lenear.so ithink i will change that part.

  10. #10
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    Hey i need help whats the stock idle on a 98z28 a4 650rpm or 750????

  11. #11
    Senior Member Too Fast's Avatar
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    Find the vacuum leak OP.

  12. #12
    Moderator 35th-ANV-SS's Avatar
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    Quote Originally Posted by too fast View Post
    find the vacuum leak op.
    this

  13. #13
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    i just change the trottle position sensor and for now it runs just fine. thanks for your help guys . the stock idle on my 98 was around 750rpm.

  14. #14
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    its funny that if the sensor was failing you didn't get a sel light, what's more disturbing is that I just got my car tuned, so if that sensor is bad the tuner should have been able to tell from the voltage readings.

    Now another question, was this happening all the time ??? or only on start up and during the warm up period (5 min) ??

    Because this only happens to me on start up and warm up, after that the car idles at almost 850 to 900 but its fine I have no issues after that.

  15. #15
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    Smile

    the problem was worse during start up and when cold out side.but now it runs fine butt it is hot out. the problem was intermitent so i cant say for sure the problem is gone forever only time will tel
    Last edited by alexs; 09-01-2010 at 04:59 PM.

  16. #16
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    Navy Blue Metallic
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    Yesterday I cleaned IAC, throttle body is new, I checked the voltage on the TPS and its fine full throttle im getting 4.4 and completely closed .4. so I dont think changing the TPS will change anything.

  17. #17
    Moderator 98TransAmWs-6's Avatar
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    have you checked your fuel filter? It could be clogged.

  18. #18
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    Quote Originally Posted by 98TransAmWs-6 View Post
    have you checked your fuel filter? It could be clogged.
    first thing i did when i bought the car, im gonna check it again.

  19. #19
    Senior Member Too Fast's Avatar
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    In 25+ years of working on cars, I've never seen a clogged fuel filter cause an idle issue. It will show up as a low power on hard acceleration first, then get worse and worse, and the customer brings it to our shop well before it has an idle problem from a bad fuel filter.

    Also, I've only fixed a low fuel pressure problem one time due to a clogged fuel filter, all most all others have been a faulty fuel pump, with a couple of fuel delivery problems mixed in there to keep me honest.

  20. #20
    Smiles for 9.5 Years cammed goat's Avatar
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    Quote Originally Posted by emenny81 View Post
    Yesterday I cleaned IAC, throttle body is new, I checked the voltage on the TPS and its fine full throttle im getting 4.4 and completely closed .4. so I dont think changing the TPS will change anything.
    Is the new throttle body the same diameter as the old one? Or is it larger?

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