Sulfer 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 03-29-2007, 03:55 PM   #1
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Default Sulfer Smell.

I did a search and found an old topic on this but it was really old so I thought I'd see if there is some updated info out there.

Whenever I mash the gas I get a sulfuric smell . Only during WOT no other time. Now the old post I read said it could be either a bad CC or worse a failing UIM. I just replaced the motor no more than a year ago and have been planning to get a highflow cat and magnaflow exaust. Should this smell facilitate the purchase of the exaust upgrades or do I have more of a problem here?
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Old 03-29-2007, 04:03 PM   #2
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Default Re: Sulfer Smell.

Quote:
Originally Posted by sacaledus
I did a search and found an old topic on this but it was really old so I thought I'd see if there is some updated info out there.

Whenever I mash the gas I get a sulfuric smell . Only during WOT no other time. Now the old post I read said it could be either a bad CC or worse a failing UIM. I just replaced the motor no more than a year ago and have been planning to get a highflow cat and magnaflow exaust. Should this smell facilitate the purchase of the exaust upgrades or do I have more of a problem here?
Actually, it'* likely a failing O2 sensor causing the engine to run too rich, thus burning in the cat. If you replace it, the only thing I would suggest is *NOT* to use Bosch, and use AC Delco.

If you run for too long with a bad sensor, you'll eventually plug your cat, so you'll want to get that changed when you can.

On the UIM causing that...I'm not familiar with that. A UIM failure will actually cause sweet smelling exhaust as coolant is burned.
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Old 03-29-2007, 04:30 PM   #3
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Old 04-02-2007, 01:39 PM   #4
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By the way do I have one or two sensors? If I have two which should I change before or after cat?
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Old 04-02-2007, 01:46 PM   #5
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Before the cat
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Old 04-02-2007, 02:20 PM   #6
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Before you change a sensor and spend the money. You'll want to get a scan tool on to ensure if the sensor is working properly. If so, then your problem is most likely only a catalytic. However the cat doesn't usually go bad on it'* own.
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Old 04-02-2007, 03:40 PM   #7
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driverjohn2005 has a scantool for your car, but I'm not sure if he has the 94/95 cable. He'* in Bonney Lake.
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Old 04-03-2007, 10:28 AM   #8
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Old 04-13-2007, 06:33 PM   #9
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John was kind enough to loan me his scan tool but the cable doesn't match. Does anyone have any idea where I can get one?? By the way this is what my hookup looks like.



Sorry about the quality
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Old 04-13-2007, 07:10 PM   #10
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That'* why I told you I wasn't sure if he had the right cable. He has the OBD1 connector, you have the OBD2 connector but your PCM is OBD1 protocol.

You need a 94/95 cable.
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