Cylinder #5 misfire. - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat
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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 07-24-2008, 07:49 PM   #11
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This may or not help but thought I would throw it out here. I have been having same code P0300 and my cylinder misfire was #4 with my Actron 9145. I did everything to find problem. I found one problem was O2 sensor wire was touching a metal bracket and giving false readings. Then my muffler blew a hole due to old age and misfiring helped it along. Replaced muffler and a bit better but O2 acting strange. O2 only a year old and about 8K miles. Cat is self destructing. I believe the failing cat killed the O2. New Magnaflow Cat and Delco O2 sensor is on it'* way. Check these out. Good luck, I feel your pain as I have been fighting this for about 3 months now.
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