New member with high idle problems when cold. - 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 11-18-2003, 10:49 PM   #1
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Default New member with high idle problems when cold.

Hi all

I am fairly new to this club and I am hoping that some of you can help me with a problem I have been fighting for about a year or so.

The car is a 96 Bonneville with the K engine. In the morning when the car is first driven, the idle will usually be excessively high. Sometimes as high as 3300 RPM'*. I will have to sometimes put the car in neutral and shot it off and then restart it to "reboot" it. This will usually help, but the then the idle goes excessively high once again. If the idle is not too high and I come to a complete stop, and then wait about 2 seconds, the VSS detects the car is stopped and it will drop the idle to somewhere under 1000 RPM'*.

I did not have this problem all summer, but it returned this fall. I have replaced the IAC motor and the plastic intake manifold. IT still does it. Does anyone have any ideas to try? Unfortuneatly(sp) I do not have a scan tool at my disposal as of yet.

Some ideas I have thought of as possible culprits were the engine computer. a temperature sensive leaky vacuum, or some other sensor.

Any help would be appreciated.

Thank you in advance\
Andy King
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Old 11-18-2003, 10:59 PM   #2
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Is your throttle body sticking open?
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Old 11-19-2003, 07:08 AM   #3
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The throttle bodies linkage and cables are not sticky. When I had it off last w/e to replace the intake manifold, I cleaned the back side of the throttle plate.

I was wondering if an injector could be excessively leaky when it is cold and if it could be, would the computer see a rich exhaust and try and add more oxygen by increasing the idle speed with the iac motor?
Just a thought.

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Old 11-19-2003, 07:20 AM   #4
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Andy, can you put your location in your profile so it shows up under your avatar and name? Also fill out your signature with your year, model, and any mods. It'll help us alot.

We may have a member nearby with a scantool. That'* really the #1 step for you at this point. Most Autozones or other car parts businesses will scan for codes for free. Just the codes, though. They won't do a realtime scan with the engine running usually, which can help alot.
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Old 11-19-2003, 09:08 PM   #5
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Willwren

I went out and put the info in. If you think I need anything else in there, let me know.

Hopefully this will generate somemore input or ideas.

Thanks for your help so far.
Andy
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