I have been noticing a weird exhaust smell from my car the past few months. I replaced my catalytic converter a few months ago when I had a nasty rotten egg smell coming from the exhaust. No rotten egg smell anymore, but still a noticeable exhaust smell inside the car whenever I step on it a little. Could this be the O2 sensor? Any help is appreciated.

Josh

 

I have a new catalytic converter and every once in a while on the highway I get the rotten egg smell, it is caused usually by the car running in a rich condition. So your 02 sensor might be causing it, how old is it?

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86 Camaro
LG4, Tuned Q-Jet
Edlebrock Performer Intake, Edlebrock Open Element,High Flow Cat,Dynomax Catback,B&M Megashifter, 160* TSAT, 3.42s, 800 Watt System

 

I have a smell that I notice when I stop and have the window down. I think it comes from the exhaust, but it is not the rotten egg smell from the cat. It is hard to describe, more of a sour smell. I have always figured it had something to do with improper fuel/air ratio. It was there before and after I had the cat changed. I have always wondered what caused it myself.

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H.D. Tripp-89FormulaWS6

 

Hot floor (from hot cat) burning your rug, hot/melting rubber/plastic underneath somewhere?

 

My car is a 91, and I just got it last year. As far as I know the O2 sensor has not been replaced, so I guess it could be that.

 

This happend to mt granddads buick, we later found out a mouse crawled up inside the engine and died!