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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 11-19-2009, 11:38 AM   #1
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I have a 98 3.8 and have been having a problem with the engin missing. It runs great 99 % of the time. What happens is when you are speeding up slowley the engin will miss once in a while. I took the car on a trip where it was very hilly and every time I would go up hill it would miss the bigger the hill the worse it got. I have had the check engin light come on a few times and all it said is #4 cyl. had missed. I did change the fuel filter but have not done anything else. Any help on where to start or what to look for sure would be nice. Thanks
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Old 11-19-2009, 12:13 PM   #2
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Check spark plugs, wires and coils, paying particular attention to cylinder #4.

https://www.gmforum.com/t278818/

If you suspect a coil, switch the coils around and see if the problem moves with the coil for cyliner #4 (do you have a scanner?).

In the dark, with the engine runnin, in park. high revs ... mist the engine compartment with a spray bottle of water and look for blue sparks (electrical arcing). This may tell you if a plug or wire is arcing to ground.

If you haven't changed plugs and wires, I would start there.

If plugs, wires and coils are all okay, switch the fuel injector from cylinder #4 with another cylinder and see if the misfire moves with the injector.

My guess is the plug wire or spark plug on cylinder #4.
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Old 11-19-2009, 06:51 PM   #3
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Let us know how you make out.
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Old 11-19-2009, 09:42 PM   #4
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Sounds like a weak spark. how old are the plugs and wires?
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Old 11-23-2009, 08:09 PM   #5
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Thanks for the info. I changed the wires and plugs and so far it is running smooth. If it acts up again I will just chabnge the coil. Thanks again for the help
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Old 11-23-2009, 08:10 PM   #6
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I would recommend testing the coil before replacing.
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