rough idle and a sulphur smell - 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 04-20-2007, 11:46 PM   #1
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Default rough idle and a sulphur smell

I've had an intermittent rough idle for awhile now. Just been too lazy to spray down my wires. The other night though it did it again but was followed with a sulphur smell like a bad cat. With 384k on it I'm wondrin if I have 2 separate problems here or are they related. EGR or O2? But NO codes thrown. Anyone had similar prob? Thanks
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Old 04-21-2007, 12:47 AM   #2
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Get your cat back-pressure tested.
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Old 04-21-2007, 06:40 PM   #3
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I had the exact same symptoms but it was a constant rough idle with backfires. I changed spark plugs and wires. Solved the problem. I found two plugs smelling like fuel so my guess I had two bad wires.
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