Running Rough in Park - 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 02-16-2010, 01:35 AM   #1
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Default Running Rough in Park

It doesn't happen every time, but lately when starting the car in Park it will run roughly (not cold start, but after it'* been driven), like the timing is slightly off. In any other gear, even neutral, idle is perfect. There'* always been a very subtle vibration while in park but all the sudden it got worse. Any ideas?
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Old 02-16-2010, 12:23 PM   #2
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That seems like exactly what is happening to my car. I have gotten answers like IAC, and vacuum leak. I have not had the time to isolate it though. :(
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Old 02-16-2010, 02:25 PM   #3
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I'd go with a possible vacuum leak also. Check all the line from the trans vacuum modulator too.
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Old 02-17-2010, 11:49 AM   #4
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Check any broken mounts. A broken mount can exaggerate an insignificant vibration
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Old 02-26-2010, 10:29 PM   #5
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I just got the transmission mount replaced while the engine was being rebuilt so it'* not that mount, it might be another though I'm not sure. It only happens rarely and started after I got my car back together.
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Old 02-26-2010, 10:33 PM   #6
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Try pulling the plugs and inspect them. do they all look alike or is one or two look different. mark each one as to what cylinder it'* from and post pictures.
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Old 02-26-2010, 10:41 PM   #7
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I just replaced all the plugs a little while ago, so they should be perfect. I've been meaning to replace my leads too, they're OEM and are looking pretty worn out, that might be it.
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Old 02-27-2010, 07:26 AM   #8
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Quote:
Originally Posted by zecc81 View Post
I just replaced all the plugs a little while ago, so they should be perfect. I've been meaning to replace my leads too, they're OEM and are looking pretty worn out, that might be it.

DidI just hear that right? OEM wires on a 92?
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Old 02-27-2010, 08:02 AM   #9
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I think it'* time for new wires.
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Old 02-27-2010, 05:44 PM   #10
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Do I know for a fact they're OEM? No, but I'm told they're very old and need replacing. What about coils, should those ever be replaced?
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