rough idle 1995 Bonneville - 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 09-08-2010, 01:54 PM   #1
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Default rough idle 1995 Bonneville

I recently had the throttle body cleaned in my 1995 Bonneville. Ever since this had been done the engine idles rough and even stalls when it is cold. It does run better when driving the car now, but I did not have the bad idle before this cleaning was done.
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Old 09-08-2010, 01:57 PM   #2
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The problem is likely a vacuum leak. Spray carb cleaner around the gasket on the throttle body and all vacuum lines. Listen for changes in idle.
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Old 09-09-2010, 12:01 PM   #3
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I forgot to add that when you first start the car it revs for a few seconds and then almost stalls.
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Old 09-09-2010, 12:56 PM   #4
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that definately sounds like a vacuum issue. Is this a supercharged motor?
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Old 09-12-2010, 11:55 PM   #5
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I was having the same problem after my motor swap and I put a different vacuum setupand it runs so much smoother, think I missed one but it doesnt jerk like it used to. So deffinately a vacuum line.
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Old 05-15-2011, 09:22 AM   #6
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I have checked all vacuum lines and they are good. New IAC valve and EGR. Just replaced exhaust gasket that was leaking badly just below oxygen sensor.
When I start the car I get a very high idle for a few seconds and then it returns to a very low rough idle, although it will then jump to a normal idle for a few seconds and the back to a rough idle. It does this continuously almost like your flicking a switch. The overall engine performance is ok, but it has sluggish areas during acceleration that it had before throttle body was cleaned.
Thanks Fred
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Old 05-15-2011, 09:34 AM   #7
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I have checked all vacuum lines and they are good. New IAC valve and EGR. Just replaced exhaust gasket that was leaking badly just below oxygen sensor.
When I start the car I get a very high idle for a few seconds and then it returns to a very low rough idle, although it will then jump to a normal idle for a few seconds and the back to a rough idle. It does this continuously almost like your flicking a switch. The overall engine performance is ok, but it has sluggish areas during acceleration that it had before throttle body was cleaned.
Thanks Fred
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Old 05-15-2011, 10:46 AM   #8
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Have you checked the PCV valve?
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Old 05-15-2011, 11:22 AM   #9
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Just had that out yesterday, it had a very little bit of sludge on it but it did rattle and i cleaned it and put it back in.
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Old 05-15-2011, 11:35 AM   #10
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Did it have a O ring and a spring?
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