Is this Normal? - 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 07-31-2005, 05:03 PM   #1
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My car idles fairly well after all the tune ups i have done so far. It also is ok at high rpms very smooth but at around 1500 to 2500 which is like light accelration/gas the car shakes and rumbles more idk if it hasto do with the supercharger bypass or something because ive alos notice that it stops when the boost reaches 0 and beyond. So it only does it when the boost is negative anyone else expierence this?
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Old 07-31-2005, 05:26 PM   #2
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Normal? No.

Vacuum leak? Coil pack?
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Old 07-31-2005, 07:46 PM   #3
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I'm thinking a vaccum leak.....Especially if it'* only doing it when there'* vaccum in the system, and stopping when it'* hit = pressure.
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Old 07-31-2005, 11:24 PM   #4
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What does a normal coil read for resistance? So the vacum hasto do with the boost? It only happens sometimes though. It didn;t happen today it felt fine but the day before that it would shake the car alot and u could feel it was uneasy.
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Old 07-31-2005, 11:26 PM   #5
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I think techinfo has the details on coil specs. But if it'* intermittent, it could be a bitch to diagnose bad coils. Could be heat makes them bad.
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