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1998 chevy 350 high idle

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  • 1998 chevy 350 high idle

    I have a 98 chevy 350 cpi with a very high idle at all time s but no ses lite?

  • #2
    Re: 1998 chevy 350 high idle

    There's a sensor in the throttle body that often gets covered in black deposits. Do a search for sensor cleaner or similar posts as yours. Good luck.

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    • #3
      Re: 1998 chevy 350 high idle

      u can take it to the dealer and have it adjusted but have you added a k&n or exhaust?does your throttle ever stick?
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      • #4
        Re: 1998 chevy 350 high idle

        Could be the IAC valve sticking


        2006 Tahoe Z71

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        • #5
          Re: 1998 chevy 350 high idle

          Have you checked for a vacuum leak? Take a can of carburetor cleaner and spray around the intake manifold, the TB, and all vacuum lines. If the engine speeds up, you'll have found your leak.
          Last edited by JohnO356; 10-08-2008, 06:43 PM.

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