P0304 Code - 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 05-04-2006, 08:39 AM   #1
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Default P0304 Code

99 SE,,,,, # 4 Cylinder misfire...

I checked the coils all check good, swapped two coils to see if the misfire moves (still waiting). New plugs and wires about a year ago.

Could this code be set by a dirty injector?

Like I said just swapped the coils last night and am waiting to see if the code returns.

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Old 05-04-2006, 08:44 AM   #2
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Pull the plug and let us know how it looks. A plug/wire doesn't have to be old to go bad. Most likely it'* the wire..but could be the plug too.
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Old 05-04-2006, 12:53 PM   #3
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What kind of plugs? Wires going bad after a year is unlikely, unless something happened to damage them. Plugs, on the other hand, can go bad any time. I had one crack in #4 about a year after installation which caused misfiring. Pull the plug and look for carbon scoring to indicate a crack.
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Old 05-05-2006, 02:19 PM   #4
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I would definitely check the plugs and wires carefully first before I'd start suspecting the injectors. In the past, I've had both plugs and wires fail shortly after installation.
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