"Question: There is a really bad smell that comes from my car. My ex, who is a mechanic, said it was the catalytic converter, but said it wasn't a problem, and that it's expensive to replace etc. I like to drive fast, so I always smell that odor (like rotten eggs and burnt rubber), so I was wondering what I could do to fix this? Any insight would be appreciated.
Answer: The “rotten egg smell” that you mentioned is usually caused by fuel mixture in the engine that is too rich. The catalytic converter may be faulty but before you replace it the “too rich” fuel mixture needs to be corrected."
Edited from here : http://www.2carpros.com/topics/catcon.htm
