Sulfur Smell at WOT - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 01-03-2008, 08:44 PM   #1
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Default Sulfur Smell at WOT

Hey guys, I'm just trying to get some more bugs worked out of my car.

Anyway, I'm getting a sulfur-like smell, usually after I go wide open throttle. I used to think it was a leaky EGR valve but I swapped in a spare. It does seem like the smell is less, but its still there.

Any thoughts? Seems like my fuel economy is kinda crappy so I'm thinking it is an emissions issue. Could a bad or leaky evap canister/filter/solenoid cause this as the entire system is original (nearly 200k miles)? Or perhaps a crappy EGR gasket (new ones can be had for like $3)?
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Old 01-03-2008, 08:47 PM   #2
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200k miles, if thats on the original cat, it may need to be replaced.
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Old 01-03-2008, 08:55 PM   #3
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Not the original cat. That was one of the first things to go when I got the car 20k miles back.

Anyway, I found this thread: http://www.bonnevilleclub.com/forum/...t=sulfur+smell

And it seems like my IAT may be toast also. Guess I should have done a search before posting

Mine is black and ugly looking too so I may drop by autozone on my way to the theatre with my girlfriend and throw it in and see what happens. I think my original air box and sensor was destroyed in a wreck in the car that the motor originally came from.

Otherwise my ECM is a rebuilt delphi unit and my MAF has around 60k miles on it (as does the rest of my motor) and it has been cleaned lately.

Edit: Oh, and I've got a new (less than 3k miles) Denso O2 in it too and I regularly run Chevron Techron injector cleaner through it.
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Old 01-04-2008, 01:19 AM   #4
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Question: How old was the Oxygen Sensor when the cat was replaced? And how long after cat was replaced was the Oxygen Sensor replaced with that new denso? 17k miles?

Also, are you getting any SES light?
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Old 01-04-2008, 01:08 PM   #5
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Quote:
Originally Posted by wjcollier07
Question: How old was the Oxygen Sensor when the cat was replaced? And how long after cat was replaced was the Oxygen Sensor replaced with that new denso? 17k miles?

Also, are you getting any SES light?
No SES light or codes.

The cat was replaced probably 15-17k miles ago and at the time had a bosch O2. I think the Bosch O2 had probably 10-15k miles on it, tops, before it was changed out for the denso. The Denso was put in about 3k miles back.
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Old 01-04-2008, 01:16 PM   #6
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In that old thread, when Dan disconnected the IAT, it ran better. Does yours?
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Old 01-04-2008, 03:04 PM   #7
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I just now replaced the IAT. The old one doesn't look too horrible, but definately not great. I haven't reset the computer yet though. But just around town, it does seem a tad better. I'll have to test drive again after I get the computer reset.

I was wanting to replace the EGR gasket too but Autozone didn't have any on hand. The one thats on the car is just old and dried-out, but I've got a little dab of hi temp silicone on it to try to keep it sealed. I may just make a new gasket from scratch if I can't find any.
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Old 01-04-2008, 04:06 PM   #8
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Default egr

egr gaskets are cheap at the dealer also. At WOT you could be just burning out some residue from the cat if you run around town a lot. I wouldn't worry about it unless your mileage is suffering.
Wouldn't recommend the WOT to much, you could do more damage than good on an 88.
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Old 01-04-2008, 10:08 PM   #9
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MPG is suffering, actually. Its been driving me nuts to try to find the source of the poor fuel economy but I've replaced all the maintenance stuff that the car needs to no end.

Hmm... oh well... I still need to test my IAC better to see....
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Old 01-04-2008, 11:04 PM   #10
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you can buy a cheap can of carb cleaner and spray it around the areas you suspect are leaking, (ie- egr tube, vac lines, intake, etc...)

if it effects the idle, you find your problem.
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