Awkward smell from exhaust after hard run - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 06-15-2007, 09:19 AM   #1
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Default Awkward smell from exhaust after hard run

Ok, I just noticed this twice. I had my windows down last night and I was at a light way out in the middle of nowhere, and I floored it from a dead stop to about 60. I let off and when I stopped at the next stop sign, I had a awkward smell coming out of my exhaust. It does have a new cat with about 500 miles on it, so I know it cannot be failing. The smell is not rotten eggs or anything like that, it'* more of a smell I cannot explain. I do know that I have KR right now, the KR is kinda random, and it peaks at 2* max on the last 3 runs. Is the smell I am smelling the engine running lean? Let me know.
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Old 06-15-2007, 09:22 AM   #2
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Did you check the exhaust for a plastic bag? Sometimes one can pick up a bag and it'll burn off over time.
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Old 06-15-2007, 09:24 AM   #3
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Nope, not a smell like that. It'* only after when I get on it hard or WOT it.
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Old 06-15-2007, 09:26 AM   #4
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Alright.. at WOT.. you are basically dumping fuel into the engine. Being that your car is a little early on..we can't check the rear O2 with your scantool. because you don't have a rear O2.

Maybe some "newness" burning off the cat as you heat it up?
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Old 06-15-2007, 09:34 AM   #5
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Actually, now that I think of it, it is more of under the car then the exhaust. I think you may be right on the "newness" burning off. It only smells when I get on it hard, or WOT it, so I think you are dead on the newness smell.
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Old 06-15-2007, 09:50 AM   #6
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It'* tough to diagnose "awkward" if you know what I mean.

But..you mentioned the key things...new parts.. different smells... and ruled out the plastic bag quickly.
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Old 06-15-2007, 05:21 PM   #7
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After I replaced my cat, I had a intresting smell after WOT runs for a few hundred miles. Watch that scan tool just in case.


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