Random/multiple misfire, cylinder # 3 - Page 4 - 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 03-23-2006, 03:44 PM   #31
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UPDATE: Today while i was sitting at a light i noticed my battery voltage changing quite rapidly, but still within the limits (not in the red). Could this be a bad alternator or battery/connections.
It seems to follow the noise im hearing from the engine, sounds as if the power isnt being delivered correctly.
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Old 04-06-2006, 11:28 PM   #32
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I changed my spark plugs and wires and still had 3 & 5 misfire, then I changed all 3 coils and yeah it runs like new.

If coils dont work it could be a bad module.
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Old 04-06-2006, 11:37 PM   #33
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We try not to suggest shotgunning 3 coils as a troubleshooting step. If a misfire is suspected, swapping coils around, or swapping in one new coil in each location is a much better alternative.

With ignition problems, checking the primary and secondary coil resistances is something easy to do, as is checking resistance of plug wires and inspecting plugs.

Fueling is rarely the issue with these types of problems. Over 95% are ignition related.

Low alternator output can indeed cause low spark voltage.
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Old 04-06-2006, 11:57 PM   #34
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The o2 sensor is out of the picture when the engine is cold. The computer doesn't use the signal until it goes into open loop operation (warmed). I suspect your coil packs, be sure to clean those two posts when you have one off. Thats the real connection back to the eec. I had a reoccuring misfire on 6 this past winter and thats what cures it, a light sanding of those two posts with very fine sandpaper.
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