Cylinder Misfire - 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 11-15-2007, 01:39 PM   #1
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Default Cylinder Misfire

My SES light cam on the other day, took it to Autozone and they read it to be a P0300, Random Cylinder Misfire. Does this mean it'* not isolated to a particular cylinder?

The fuel filter, plugs and wires have been changed so I think they are all out as the problem. I tested the secondary coil leads and they were 1/4:6.07, 2/5:6.25, 3/6:6.0. I'll be testing the primary leads tomorrow.

On a side note, I have had and continue to have a sluggish response from about 1500 to 2500 RPM at times in OD.

With these 2 pieces of info, can anyone offer suggestions on what it could be?

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Old 11-15-2007, 02:36 PM   #2

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To rule out ignition related items.. Get a spray bottle that will mist. (garden hose can also work)

Wait until the hood and mist down the engine. Look for the electrical show. When you see sparks jumping around...that'* the area where the issue is.

Another thing is to check for the #6 plug wire touching the O2 sensor wiring.
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