Sulfur smell from tailpipe when running a 1993 Chevy caprice wagon?

Answer 1

Smells like rotten eggs? Catalytic converter is getting clogged and now is getting hot. This can cause your engine to run hot and possibly blow a head gasket or worse. Catalytic converters are VERY expensive $300-$600 depending on the car. MAKE SURE YOU KEEP THE OLD ONE. Take it to a scrap yard and get roughly 100-150 bucks for it.

A little cheap trick that sometimes works, take a steal hammer, or 3lb sledge works nice. Crawl under your car and check to make sure the cat is not rusting really bad. If it looks pretty solid then violently beat on the catalytic converter, They are very well built and can take the abuse so don't be shy. This sometimes loosens up the carbon build up in the cat and can save you the expense of replacing it. It doesn't always work but its worth a shot, worst case you still need to replace it.