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my exhaust smells like farts.... thoughts???

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Old 08-20-2009, 12:31 PM   #1
Xeno
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Default my exhaust smells like farts.... thoughts???

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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Old 08-20-2009, 12:37 PM   #2
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Maybe your farts smell like exhaust, JK. Do you have a tune on the car sometimes this can effect it. Different fuels can have different smells also. Maybe try another brand and see if it changes.
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Old 08-20-2009, 12:43 PM   #3
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Maybe it IS your farts.
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Old 08-20-2009, 01:11 PM   #4
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Its normal, before I got the o/r prochamber mine smelled like eggs/sulfer. Just loose the cats, it will sound better and smell better
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Old 08-20-2009, 01:12 PM   #5
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Quote:
Originally Posted by Vectorpat View Post
Maybe your farts smell like exhaust, JK. Do you have a tune on the car sometimes this can effect it. Different fuels can have different smells also. Maybe try another brand and see if it changes.
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Originally Posted by domindart View Post
Maybe it IS your farts.

har har har, guys (i knew i'd get responses like this)

anywho, i don't have a tune (yet) and as far as the brand goes, do you suppose it could just effect one vehicle (since my parents use the same brand and don't have any problems)

Quote:
Originally Posted by mynameismike65 View Post
Its normal, before I got the o/r prochamber mine smelled like eggs/sulfer. Just loose the cats, it will sound better and smell better
do you suppose hi-flow cats would have the same effect (i don't really want the 'uber'-loud exhaust the o/r setups can have).

oh, and on a side note, i have gta exhaust
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Last edited by Xeno; 08-20-2009 at 01:15 PM.
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Old 08-20-2009, 01:27 PM   #6
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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
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Old 08-20-2009, 01:36 PM   #7
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Actually it's your UPPER lip......j/k
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Old 08-20-2009, 02:32 PM   #8
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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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Old 08-20-2009, 02:42 PM   #9
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I have seen and used a product to clean catalitic converters. Be worth a shot. I got it at an auto parts place. You just pour it in your tank.
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Old 08-20-2009, 02:56 PM   #10
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You haven't thought about fouled O2 sensors. Sensors that are carbonized from running rich can cause false readings to be given to the PCM. Over time this will saturate the Cats.
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Old 08-20-2009, 03:09 PM   #11
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Normal to some extent. I've noticed it in many, many cars. Including ones that were way to new for bad cats.
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Old 08-20-2009, 03:31 PM   #12
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Quote:
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You haven't thought about fouled O2 sensors. Sensors that are carbonized from running rich can cause false readings to be given to the PCM. Over time this will saturate the Cats.
you're right, i hadn't thought about that yet. is there a way, that you know of, to tell if they are bad?


Quote:
Originally Posted by sonicmetalicS197 View Post
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 think I need to sea foam
i haven't been able to check all exhaust connections yet, but that will probably be my next 'check'. funny thing, though, i actually just checked my cai a couple of days ago for leaks... no problems, though


also, on a side note/question... i know when you seafoam you need to suck it through a/the vacuum hose, but i've never been sure which hose is the right one (so a pic or something would be appreciated )


thanks for all the suggestions so far, too
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Old 08-20-2009, 03:57 PM   #13
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On occassion, My Stang's exhaust smells like rotten egg fart. I stopped filling up the tank with beans and now she is fine. lol J/K
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Old 08-20-2009, 04:02 PM   #14
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I wouldnt read too much into it. I gaurantee your cats are still fine. It just smells, alot of people have noticed it too. Im not sure how High flow cats will make it smell lol. I have an o/r prochamber and honestly its not all that loud. It is very tolerable.
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Old 08-20-2009, 04:15 PM   #15
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My GF was following me in her Z, I floored it and she said it was very strong smelling but she didnt say what it smelled like. I also have high flow cats so it may make some difference too.
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Old 08-20-2009, 05:44 PM   #16
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Ive never had a rotten smell from my exhaust......before or after the bassani high flow cats. I use chevron 91 all the time.
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Old 08-20-2009, 06:07 PM   #17
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Quote:
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You haven't thought about fouled O2 sensors. Sensors that are carbonized from running rich can cause false readings to be given to the PCM. Over time this will saturate the Cats.
Xeno....90% of the time if the sensors are bad you will throw a code? So any codes thrown?
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Old 08-20-2009, 06:41 PM   #18
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^^ nope, no thrown codes (that's why i didn't really think about it, but i wasn't sure if you could do one of those basic diy diagnostic checks or something)
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Old 08-20-2009, 07:32 PM   #19
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Mix some 2 stroke oil into your gas. 1 ounce per 5 gallons.
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Old 08-20-2009, 09:38 PM   #20
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well maybe someone took a dump in ur pipes and u got a turd in there lol, no worries filler up with some jet fuel and burn that smell out!!
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Old 08-20-2009, 09:38 PM
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