Shudder / Misfire around 55 mph and accelerating - Page 2 - 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 04-01-2004, 11:03 PM   #11
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I had a coil go bad on me, but only when hot. By the time I measured it, things were cooler, and would read normal. Wasn't until I went to the MSD'* that my problem was solved. Very frustrating. I knew I had a 2-cylinder miss, so it had to be a coil. Plugs told me which one
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Old 04-02-2004, 01:13 AM   #12
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Fudd, sounds like your CAT to me, when mine was rattling around it was shuddering like you said. Also i had a coil pack start going, it gradually shudderd until it was a compleat mis fire. Could it be the compleat ICM its self? Possibly from the water?
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Old 04-02-2004, 06:10 PM   #13
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I haven't checked the cat yet, I will kick it this weekend. However, I was experiencing a miss at low idle, too, before I changed the wires and plugs, so I am not suspecting the cat.

I should have time to work on everything this weekend.
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Old 04-03-2004, 12:36 AM   #14
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I've done everything but it still misfires with TCC lockup. I think that gitting rid of Bosch items in the car might help.
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Old 04-03-2004, 07:22 PM   #15
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Problem Solved!

I tried putting back in the ignition coil that I purchased in December to replace the stock coil, and guess what? Missfire after TCC lockup and OD. I pulled over and put the spare old coil back on and the misfire went away. So I have it narrowed down to a bad coil. We'll see if the auto supply store will exchange it.

I did catch the bad coil sparking from the mounting screw to somewhere on the plastic part of the coil for a few seconds - the plastic must have a problem with the insulation.

FYI I also took the ICM off and cleaned the underside of it and the mounting plate. It was a little dirty under there. I used a wire brush and then rubbing alcohol.
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