Sulfur/Rotten egg exhaust smell

dr.gonzo! · September 2nd, 2009, 11:54 AM

I noticed when I drive hard and come to a stop I smell a sulfur. I have heard you might smell this on a cold start before the cats are heated up, but my car does it when the car is plenty hot and I run about 90mph and come to a stop.

Does this sound like a clogged cat? I had the guy weld the tube that goes to the smog pump and after I did it I read about that can foul the cats pretty quick.

I really wish I hadn't welded in this catted x pipe and bought something that bolts up.

Oh well...its just more money.

whiteboycustom · September 2nd, 2009, 11:56 AM

could be you getting to 90mph and scaring the shit out of you then its the shit smell rising from your pants???

dr.gonzo! · September 2nd, 2009, 12:05 PM

lol and sorry I posted this here. I meant to put it in the 5.0 section

dr.gonzo! · September 2nd, 2009, 03:12 PM

Can a mod move this to the 5.0 section right meow!

futureMACH1racer · September 2nd, 2009, 03:31 PM

Sure thing

dr.gonzo! · September 2nd, 2009, 03:32 PM

Thanks

Dont forget my post count!

Chris951 · September 2nd, 2009, 03:35 PM

Sounds like your cats are toast. That tube that goes from the smog pump to the mid pipe feeds fresh air to the cats so they don't fail...

nolife · September 2nd, 2009, 03:54 PM

The sulphur smell is typically related to a rich condition, not really that the cats are bad. Of course the longer the car is not running right or the A/F is jacked, the shorter life the cats will have. A rich condition after a lean condition can smell even worse. I could bust out the chemical equations but it is basically hydrogen sulphide being let off from the excess sulphur being released while rich that "collected" in the cats while being lean. That might explain your smell after getting on it. You may be normal or a little lean and then when back at idle you are rich. My supercharged 88 does the same thing and my cats are not that old. Vac leak, exhaust leak, O2 sensors maybe throwing your A/F off or I'm sure that tube from the pump has something to do with the correct temperature of them as well. Maybe just a tank of bad gas with high sulphur content?

fl4321 · September 2nd, 2009, 06:11 PM

batteries smell like rotten egges when the go,but it is probably the cats

95StangMX · September 2nd, 2009, 06:18 PM

+1 definately the cats. I used to work at a muffler shop, and would see it (smell it) all of the time

September 2nd, 2009, 11:56 AM	#2
whiteboycustom El Conquistador 83 coupe Join Date: Feb 2007 Location: vidor,texas Posts: 1,148 iTrader: 0 reviews	could be you getting to 90mph and scaring the shit out of you then its the shit smell rising from your pants??? __________________ http://www.donttearmedown.com/

September 2nd, 2009, 03:31 PM	#5
futureMACH1racer Honeybadger is Crazy 2008 F-250 Super Duty Join Date: Sep 2007 Location: United States of America Posts: 10,901 iTrader: 0 reviews	Sure thing __________________ RIP Travis Bilings 5/6/1982-7/5/2011 Be polite. Be professional. But have a plan to kill everyone you meet.

September 2nd, 2009, 03:54 PM	#8
nolife Hardcore Enthusiast 91GT, 88GT, 02GT Join Date: Dec 2006 Posts: 2,878 Blog Entries: 3 iTrader: 0 reviews	The sulphur smell is typically related to a rich condition, not really that the cats are bad. Of course the longer the car is not running right or the A/F is jacked, the shorter life the cats will have. A rich condition after a lean condition can smell even worse. I could bust out the chemical equations but it is basically hydrogen sulphide being let off from the excess sulphur being released while rich that "collected" in the cats while being lean. That might explain your smell after getting on it. You may be normal or a little lean and then when back at idle you are rich. My supercharged 88 does the same thing and my cats are not that old. Vac leak, exhaust leak, O2 sensors maybe throwing your A/F off or I'm sure that tube from the pump has something to do with the correct temperature of them as well. Maybe just a tank of bad gas with high sulphur content? __________________ Last edited by nolife; September 2nd, 2009 at 04:06 PM.

September 2nd, 2009, 06:11 PM	#9
fl4321 Regular Join Date: Jul 2009 Posts: 60 iTrader: 0 reviews	batteries smell like rotten egges when the go,but it is probably the cats __________________ you dont need no teef to eat my beef

September 2nd, 2009, 06:18 PM	#10
95StangMX MM Fanatic 95 Mustang GT depends how many people are pushing Join Date: Oct 2007 Location: Playa del Carmen, Mexico Posts: 3,223 iTrader: 0 reviews	+1 definately the cats. I used to work at a muffler shop, and would see it (smell it) all of the time __________________ People should think about boarding up their glass house before starting a rock fight!

September 2nd, 2009, 03:35 PM	#7
Chris951 Hardcore Enthusiast 1991 mustang 5.0 Join Date: Aug 2007 Location: Mesa, AZ Posts: 1,933 iTrader: 0 reviews	Sounds like your cats are toast. That tube that goes from the smog pump to the mid pipe feeds fresh air to the cats so they don't fail...

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