high idle (i think) - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1987-1991 Parley with regards to your 1987 to 1991 Bonneville, Olds 88 or Buick Le Sabre Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 08-16-2007, 11:18 PM   #11
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What do you mean by "off" slack in the cable with make them lower and tension will make them higher, but by adjusting it right to the plate and nothing more will put them in the perfect place. there is no guesswork.
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Old 08-17-2007, 02:46 AM   #12
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If the idle really is a little high, don't forget to check your vacuum lines. If you're getting extra air from a vacuum leak, the IAC might be completely closed and unable to limit your idle speed. I saw this on a Saturn once, didn't throw any codes, still ran okay.

If the vacuum like fell off of the transmission shift modulator, that could also explain "off" shifts perhaps? Not sure exactly what that would do though, honestly. I'm thinking really firm shifts, but I could be off.
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