Idle problem-iac? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 03-24-2009, 07:35 PM   #1
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Default Idle problem-iac?

I recently replaced LIM & TPS & had all codes cleared. A few days later the engine light came on. Had it scanned & recieved code p0507. The car was running still running good so I drove it to work the next day. When I started it up the idle was high--2k rpm. I drove it about 2 miles & when I came to a stop sign, I turned it off & restarted it. The idle returned to normal. Thhis afternoon I started it & the idle went to 3k-3.5k rpm. I drove it a short distance then cut it off. It returned to normal. Is it the IAC? Is there a test for this?
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Old 03-24-2009, 09:17 PM   #2
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Did you by chance see this thread https://www.gmforum.com/t279317/ for trouble shooting?
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Old 03-24-2009, 09:27 PM   #3
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I'll check it out. Thanks!
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Old 03-24-2009, 09:36 PM   #4
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I didn't see anything about high idle. What'* the best way to check for vacuum leaks?
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Old 03-24-2009, 09:44 PM   #5
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You can spray carb cleaner around the vacuum lines while the engine is running. If the RPM goes up, you found a leak.
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Old 03-24-2009, 10:30 PM   #6
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Duh--I knew that. I'm brain dead tonight.
thanks
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