My exhaust sometimes smells like rotten eggs. I've been told it could be the Cat or Battery, but i replaced both about a month ago. What else could it be??

Any help would be GREATLY appreciated!
Thanks!


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1985 LG4 Z28
White w/ Grey ground effects
Red interior
K&N Chrome Element and Filter
Flowmaster 80 series muffler
Aftermarket High-Flow Cat
Chrome Edelbrock Valve Covers

 

hmm. are u the same that posted this a while ago. im asking because im just curious how long its been smelling like this. then we'll go from there.

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- David
88' GTA 5.7L TPI MODS---> air foil, K&N, Shift Kit, 180* therm, TB bypass, Gutted CAT, Flowmaster 80 Series

 

lmao, breathment i like that little happy face on your sig.. lol

 

no, i'm not the guy from the other post,

hmmm, its been making the smell for about 3 months, if that helps

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1985 LG4 Z28
White w/ Grey ground effects
Red interior
K&N Chrome Element and Filter
Flowmaster 80 series muffler
Aftermarket High-Flow Cat
Chrome Edelbrock Valve Covers

 

before or after changing the cat?

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- David
88' GTA 5.7L TPI MODS---> air foil, K&N, Shift Kit, 180* therm, TB bypass, Gutted CAT, Flowmaster 80 Series

 

before, so i guess thats not it

 

check the O2 and the PCV valve

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- David
88' GTA 5.7L TPI MODS---> air foil, K&N, Shift Kit, 180* therm, TB bypass, Gutted CAT, Flowmaster 80 Series

 

Could be from running too rich. Also make sure your choke is opening up when it warms up.

 

Don't know how many times I've said this, but have you kept using the same gas? Could be high sulfur content from bad gas, try a different brand and/or higher octane.

 

I had the same problem....only thing was i had the problem AFTER i got a new caty. I changed my caty b/c a part inside was shot. But after i changed my caty i had problems such as that smell and the car running rough. I changed the sparks in it and the wires and still didn't do anything. I then checked my coils to make sure they were good and sure enough one was shot. So i changed that and it all went away. Not sure what your problem is but that's what got rid of mine.