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Hight idle, code 507. 97 Burb

Discussion in 'Chevy Suburban Forum (GMC Yukon XL)' started by fierodough, Mar 12, 2007.

  1. fierodough

    fierodough Member

    I have a high idle, just over 1K RPM. I get a check engine light and code 507. Iac idle higher then expected.

    So is there a way to test the iac valve beffore I sped $100 for a new one? Could there be something else that may set off this code? Any vacuum lines that are prone to break? I heard something about the throttle body gaskets being prone to leaking?


    With the cost of gas, I'd really like to have her running as best as possible. :)

    PS: 5.7L Vortec 97 Suburban.

    Thanks!
    Eric
  2. Cableguy

    Cableguy Epic Member 5+ Years ROTM Winner 1000 Posts

    Hi Eric I hope this helps...

    TROUBLESHOOTING HINTS (The most likely causes for this code to be set are):
    Idle air control motor failed.
    Open or shorted idle air control motor circuit, or loose connector.
    PCM failed.
    There is a troubleshooting procedure for checking the circuit and pinpointing the problem, but before doing that I would recommend cleaning the throttle body first. Many times a simple cleaning will eliminate this code.

    Good luck :cool:
  3. fierodough

    fierodough Member

    thanks for the reply.
    Cleaned out the TB with cleaner and a toothbrush. It's spotless. I think I need to bite the bullet and buy an IAC.. *sigh*

    what should the idle be at on a 5.7 Vortec? I got the truck with this prob..

    Cheers!
    Eric
  4. Cableguy

    Cableguy Epic Member 5+ Years ROTM Winner 1000 Posts

    I think idle speed is 600 hot and 800/900 cold...
    anybody else?
  5. TrailLeadr

    TrailLeadr Epic Member 5+ Years 1000 Posts

    Sounds about right.

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