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well, i did a search for this, and found kind of a mix of answers. in my case, i've got an '05 gt, with 18,000 miles.
my thoughts at first were bad cats, but some of the other threads i've found had someone with the same problem, and they had ~25k miles on their car; and everyone thought that was pretty low mileage for bad cats. (maybe there is a hole in one, or both, of them)
next, i figured bad gas. since day one of ownership, i've gotten my gas at quiktrip; if there is anyone who hasn't heard of them, they are pretty much the biggest gas station.... place in the kansas city and surrounding areas, so i am pretty sure they use a decent quality of gas (plus, my parents and grandparents fill up there and i've never noticed the smell in their cars).
then i read that some people suggested going wot to help 'clear' the cats out. well, i frequently go wot, so they 'should' be clear
so... i've kind of ruled out the three major possibilities (even though one of the three could still be the problem). the sulfur/fart smell is present from the first time i turn the key until i shut her off. or, maybe it's normal and i just have to live with it
any additional thoughts would be greatly appreciated (i'm not too fond of holding my breath while driving )
cliff notes: my car's exhaust smells like farts... why?
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I have noticed the exact same thing, but only at certian times I haven't been able to notice a pattern or rmp range for the problem yet. I always use Shell V powah gas. I noticed an exhaust leak right under the cabin, where my mufflers are, so I tightened up the clips and that seemed to help alot, cut down on the smell prolly 80% but I've still smelled it like once or twice since then. So that might help, smoke your pipes just to b sure, also check your cai/airbox for leaks I had one on my cai so that might have been a cause too...filer fell off, fuxing K&N that's the 2nd time I think I need to sea foam
If it smells a little like rotton eggs.. it may be the sulfur content in the gas you are using. You can't rule out bad gas until you try a different brand.
Try Shell or BP.. Shell is the best quality in the STL area... maybe yours too. The gas itself is usually the same across brands.. but Shell, BP, etc.. have higher quality additives that are mixed in at the refinery.
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