My car is cookin up sumthin gooood - 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 01-09-2007, 09:42 AM   #1
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Default My car is cookin up sumthin gooood

SO about 3 weeks ago I started smelling a funny smell from my car'* exhaust. Now I have had plenty of problem cars, so I know too well the smell of burning oil, water, coolant, wires and tranny fluid. This is none of that. Imagine the smell of putting possums on a grill and letting them sit there cooking until they're burnt. That'* the smell I get.

My first notion was that a mouse had crawled up into my exhaust and met an untimely end, or maybe I had run across some road kill and rubbed some sticky flesh onto my exhaust system. After the smell didn't go away I jacked the car up and saw no remains of animals smeared on the bottom. I also figured that a burnt mouse would have gone away, but the smell persists and hasn't subsided much in over 3 weeks.

Anyone have any ideas?
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Old 01-09-2007, 09:45 AM   #2
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could be a LIM or UIM

95 is a L36 so... Check your oil and coolant levels and check oil for any coolant in it.
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Old 01-09-2007, 09:51 AM   #3
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Not sure what a LIM or UIM are. The fluids are fine. I check them regularly, I installed this engine about 20K ago and am still paranoid that something will happen. She runs like a top, but this smell is getting kind of irratating.
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Old 01-09-2007, 09:52 AM   #4
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Oh....duh....Upper Intake Manifold or Lower intake Manifold? Sorry, I get hit in the head alot. When I installed the engine I checked both because of the known problems and they were good at the time. like I said, having no oil or water problems and the car runs fine. Just this smell
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Old 01-09-2007, 11:10 AM   #5
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First, I have to say that I don't know what possums burning on the grill smell like, but I would assume that they might smell a bit like charring flesh.. BTW, I did chuckle while reading it.

Ok, so if I read this correctly, the smell is coming from your exhaust right? The tailpipe end, I assume?

Does it smell vaguely like rotten eggs or sulfer-like?
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Old 01-09-2007, 11:31 AM   #6
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Darn you Lash..

If it'* a rotten egg like smell, that would usually indicate a bad catalytic converter. Whenever replacing the converter (which can easliy make the life of a car) you must ask if the O2 sensor is good. A bad O2 will dump excess fuel into the motor and cause the Cat to go bad.
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Old 01-09-2007, 12:22 PM   #7
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Agreed with Bill, Pull the 02 and check if its dark grey or black at the tip, this would indicate a rich sensor. Also try changing your brand of gas, and a bottle of fuel injector cleaner.
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Old 01-09-2007, 12:29 PM   #8
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While this is obviously where I was going with my line of questions, guys, I think that it'* too early to jump directly from burning opossum flesh to O2 and Cat (even though it'* maybe a reasonable jump).

I really think we should wait to hear back from birchy before we start spending his money.

Just my cautious way of doing things.....
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Old 01-09-2007, 12:33 PM   #9
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Mikey.. I haven't spent money. Merely mentioning the typical source of the cooked o'possum smell if you aren't cruising by a restuarant in the south.
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Old 01-09-2007, 12:44 PM   #10
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Well, since we're already well on our way into the analysis, I'm going to ask a few more questions to staisfy my curiousity.

Birchy, why did you swap the engine out? Did it have a previous UIM or LIM failure and was burning coolant?

Were you running too rich on the previous one?

Has the smell been around ever since you did the swap?
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