Rough Idle - 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 11-26-2005, 10:31 AM   #1
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Default Rough Idle

Hey everyone,

ever since i bought my SSE/SC i've had a very rough idle. recently i changed:

plugs (AC-Delco)
plug wires(AC-Delco)
fuel filter
air filter
cleaned the TB
Cleaned the PCV

this improved the idle much, but at idle in drive, i still feel a bit of a surge and uneven idle through the steering wheel. any one have any idea'*?

Thanks,
Devon
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Old 11-26-2005, 11:57 AM   #2
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Possibly a weak coil. Could also be a weak or failing FPR or fuel pump.
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Old 11-26-2005, 01:44 PM   #3
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i checked fuel pressure, it was strong. only thing i havent checked it coils
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Old 11-26-2005, 01:49 PM   #4
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How well did you clean the IAC passage in the TB, and the IAC itself?

It'* either fuel (could still be injector), spark (probably coil at this point) or air.
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Old 11-26-2005, 02:12 PM   #5
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Does it seem like this????

http://media.putfile.com/11--23-Bonne-Idle
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Old 11-26-2005, 02:15 PM   #6
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Vacuum leak?
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Old 11-26-2005, 04:09 PM   #7
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checked all the vacuum lines yesterday, all seemed good, not dryrotted either

lakevillessei- thats much worse than mine is. i cant even hear it the bad idle, i feel it through the steering wheel.... it sounds fine
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Old 11-26-2005, 04:17 PM   #8
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Lucky you.


I would start looking at the vaccum system.
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Old 11-26-2005, 05:23 PM   #9
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Could the EGR valve be another possibility?
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Old 12-07-2005, 06:10 PM   #10
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My 94 just started doing this today. At lunch it took a few seconds for the car to get started (cold). Then it was idling really lousy and nearly stalled. I revved in N a bit to get er back going.

Just now my SES light went on. Idle is better in drive, but really noticeable in park.

taking it in tomorrow.
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