High Idle When Starting, Cold Temperatures - 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 01-03-2008, 10:35 AM   #1
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Default High Idle When Starting, Cold Temperatures

It'* been bitter cold here (2 degrees F) The first thing in the morning when I start my 1996 Bonneville I experience a high idle. It starts out at 1500 rpm and climbs to 3000 RPM. After the car warms up and I put it into gear and drive it for 10 seconds, the idle returns to normal (in neutral and in gear) It'* a new engine, when I replaced the motor, I replaced the MAF and MAP sensors. This has just come up and the motor doesn't even have 10,000 miles on it. Any suggestions?
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Old 01-03-2008, 10:40 AM   #2
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The solenoid on your IAC Valve is probably stuck open. The IAC controls that initial idle.
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Old 01-03-2008, 10:43 AM   #3
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Default IAC?

I'm not familiar with the IAC, I'll check it out.
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Old 01-03-2008, 10:45 AM   #4
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Try here. It'* really called the idle air control valve.


http://www.alldatadiy.com/alldata/AF...57342/34857358
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Old 01-03-2008, 10:45 AM   #5
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Default Wait I am Familiar Idle Control DUH

I did replace the IAC too. The original one was full of carbon; since it was relatively cheap I replaced it. I will check it out though.

Mike
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Old 01-03-2008, 10:46 AM   #6
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hmm... that would be by only guess unless you have a vacuum leak somewhere. Did you do any recent work to it?
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Old 01-03-2008, 10:54 AM   #7
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Default No Recent Work

The last work was putting in the new engine. It'* a brand new 99 GM Crate motor. New Intake (with the stove pipe fix) The only thing that was reused were the fuel injectors and the coil packs. I remember before I replaced the IAC on the new motor (the old motor before it threw a rod) had a high idle problem, I'll check out the IAC, maybe the O-ring isn't seated properly.
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Old 01-03-2008, 11:02 AM   #8
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Default idle

I too have a problem with a high idle on my 96 only the car runs @ 1500 and stays there until you kick the pedal, then it goes down.
If you are jumping up to 3000 something else is wrong like a bad temp sensor, vac leak, or maybe the inlet air temp sensor is bad.
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Old 01-03-2008, 11:04 AM   #9
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My idle was stuck at 3,000 rpms no matter what I did when I put everything back together after my LIM gasket install. I put the Throttle Body positioning sensor on wrong and it was actually holding the throttle body open a little, but enough to give it a really high idle.
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Old 01-03-2008, 11:08 AM   #10
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Default Re: idle

Quote:
Originally Posted by SSEBONNE4EVA
I too have a problem with a high idle on my 96 only the car runs @ 1500 and stays there until you kick the pedal, then it goes down.
If you are jumping up to 3000 something else is wrong like a bad temp sensor, vac leak, or maybe the inlet air temp sensor is bad.
Yup, battled that issue with my 99 SE too. Was still doing it when I sold it with 177,000 on it this past summer...

My brother'* 2003 Grand Prix with 122,000 does it too. Very odd to say the least.
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