Random misfire.. what to check besides plugs,wires, coilpack - 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 05-11-2005, 02:48 AM   #1
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Default Random misfire.. what to check besides plugs,wires, coilpack

Hello everyone,
the wifes 96 Olds 98 started throwing random misfire codes at me only when doing 70+mph and bucking of course. I won't have the car until friday where I plan to check the plugs, wires, and coilpacks. Its definitely not chuggle. the rpms drop, not rise

Since this only happens at speed, might my problem be ignition module related or would I get a different code thrown at me for that?

Also I would like to go thru and clean up grounds, besides the obvious battery cables, where else might they be? I realize this is a Bonne forum, but you guys are SOOO much better than any olds forum I've tried

thanks,
popa tim
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Old 05-11-2005, 07:52 AM   #2
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I had the same random mis fire code...plugs and wires fixed it.

also, had the same symptoms you described except it happened between 52&55 when accelerating in OD.
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Old 05-11-2005, 09:25 AM   #3
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The only grounds related to the ignition, are the ones on the ICM Bracket. Since you have a S2, not sure if this applies to you, but just follow the Negative Battery Cable, you'll find it, wherever it may be. I doubt that is you problem though, but it doesn't hurt.

Sounds like a wire to me.. but ya never know.


-justin
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Old 05-11-2005, 10:25 AM   #4
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Just simply change your plugs and wires. You have a bad wire is my bet. Either almost broken (intermittent) or a short through the jacket to ground.
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