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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 01-16-2005, 05:20 PM   #11
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That'* not valid then. All you know is when it heats up, that one cylinder isn't firing. My advice above is still the way to go.

Pull all 6 plugs, keep them in order. You're looking for a pair of fouled plugs common to one coil, or maybe even 4 plugs common to two.
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Old 01-16-2005, 06:28 PM   #12
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Well before jumping all over the rich thing, check the o2 crosscounts. The engine will bounce from rich to lean over and over, which is normal. Your o2 mv is high, but that'll bounce around quite a bit too.

Other than that, Bills got you goin in the right direction.
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Old 01-16-2005, 11:44 PM   #13
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thanks a lot dr jay and willwren i will try that tomorrow
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Old 01-17-2005, 10:12 AM   #14
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well today off i go to check plugs wires and coils be back later today
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Old 01-17-2005, 10:46 AM   #15
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I had that same problem after I changed the ignition module. It was my aftermarket ignition module I bought auto zone. put a gm one in there and no problems since.
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Old 01-17-2005, 12:34 PM   #16
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Thats what I was thinking the ICM or the connector electrical fault.
If after you check the spark thing and they all don't spark check for injector pulse also.
If no pulse you could have an intermitten fault in the ICM or connector.
Sometimes a loose pin on the socket connector will loose connection when hot.
Tighten up on all the ICM plug connector sockets.
Is this an aftermarket ICM or Delco?
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Old 01-17-2005, 12:41 PM   #17
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I think we need to read the plugs first, guys. The plugs will tell you what'* happening, and where to look. If he finds all 6 fouled, then we'll look at the ICM. If not, then it'* probably a coil or wire.
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Old 01-17-2005, 03:03 PM   #18
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could it possibly be loose/bad MAF wires? He did say the intake fell off at one point.
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Old 01-17-2005, 04:31 PM   #19
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The MAF cannot cause loss of spark.
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Old 01-17-2005, 06:43 PM   #20
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Like I said "if after".
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