badass1g

i still have cats but when i accelerate hard on the car and come to a stop light i can smell like a rotten egg type smell wtf is that? and how can i get rid of it? i thought of getting off road x pipe but if its gonna smell more like rotten eggs than i wont do it, anyone else have this prob? its an 01z06. thanks

0Jeff @ TPE

Cats can go bad you know. It sounds like you have a toasted cat.

Mike94ZLT1

2x on the bad converter

rws.1

You either have a leak in your exhaust ahead of the cat or your cts can't handle WOT flow or you cats are cooked.
I'd post asking for recommendations on high flow cats.

badass1g

really? so when cats go bad they make car smell like eggs?when u say they go bad u mean they are clogged? when my 01 z06 was bone stock it dynoed 333 rwhp and 336 tq doesnt that seem low? and so i should be good for off road x pipe? i just dont want it to get worse smelling

InSaNeKaMeL

i dont have cats and you can tell but its that bad

InSaNeKaMeL

and it will be LOUD

badass1g

whats that bad? i dont get that last post

turboc5

bad cats. They are covered by a epa 8 year warranty for emmisions. Maby you could get a dealer to replace them, if they are stock that is.

Nithros

Do you have headers or have you taken the rear hood seal out or have you installed an aftermarket shifter? Also, is it worse when the heater/Ac is on?

Shane_S

Smells like bad cats to me. I say it's time for a full off-road exhaust system complete with LG Headers.

Shane

badass1g

stock headers, ihavent takenany hood seal out, stock shifter, i cant tell diffrence with ac/heater on..i can hear when driving a slight ticking noise. almost like its just regular engine noise through firewall? or could possibly be a tiny leak at the headers? but i smell the rotten smell from the rear of exhaust not the engine bay

Nithros

Knowing that, I'll go with the bad cat answer. I just noticed when I did all of this, I started getting fumes in my car. I thought cats were supposed to smell like rotten eggs somewhat and if you had made any of those changes, you were starting to smell what had already been there and you just never noticed it.

dpd

the rotten egg smell is from fuel.rich mixtures tend to do give the smell due to raw gas getting into the cats.chances of a bad cat[s],possible.likely hood,doubt it.don't know if you've done anything to the car[cai,intake,etc]that would warrant running richer.but i would start there.leaking injectors would also give you the smell,JMO

Warp Factor

The smell means the cats are doing their job. If they weren't, you'd get a raw gas smell, the same smell many have complained about after removing their cats.
You could possibly be running rich at WOT.
I get the same smell you're getting under the same conditions, but I'm running about 11.5 fuel/air (on purpose) at wide open throttle, so that's expected.

badass1g

iiiii yyiiiiii iiiiii... so some peeps say one thing and others something completely different. any other people want to chime in? i want my car louder and dont mind the gas smell i would prefer that over the rotten egg smell. lol

boomer 33

Your cat converters are stopped up. Run with that thought. If you wait for everyone on the forum to be in complete 100% agreement on anything your wait will be for eternity. There is no such thing as 100% agreement from everyone. Never seen it, never will. There is a recent thread on here with two pages of argument on the proper way to replace a battery !!

JonLT4CE

I would refer to the troubleshooting manual. Rotten egg smell is not necessarily a bad cat. New Chrysler cars from about 20 years ago were notorious for this. It had to to with the catalyst and A.I.R. sytems combined. I could follow behind a new car going up a hill and smell rotten eggs. 9 out of 10 times it was a Chrysler product.

I would put it on a sniffer. Is it throwing any codes? Are you sure it's going in closed loop mode? It's tough to spend money using the shot-gun method only to find out that it was not the problem. Been there-done that.

badass1g

no codes, and what is closed loop?

DngrZne

It's when the computer is adjusting it's air/fuel ratios constantly based on input from the front O2 sensors, unlike when the engine runs purely from tables at WOT.