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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 01-04-2009, 03:27 PM   #1
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Hey Guys
I could use some help.I got a p303 code.what happens in the morning I get a rough idle and the check engine light comes on after about two hours the light will go off. plugs where changed about 4 months ago.does anybody have an idea what it could be ?
Thanks Bull
98 se 185000kms
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Old 01-04-2009, 03:39 PM   #2
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P0303 Misfire Detected - Cylinders 1-10.

Have you inspected your plugs? Check your plug wires make sure none or touching ground or the O2 sensor wire. Check for vac leaks. That can cause error codes like that.
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Old 01-04-2009, 03:49 PM   #3
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misfire is in cyl 3 wires look fine but i have noticed a possible vac leak but can't narrow it down.
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Old 01-04-2009, 04:37 PM   #4
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Get a can of carb cleaner and spray the vac lines while the engine is running. If the RPM changes you found a vac leak.
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