Rotten egg smell
 

Hi Ya'll. Me again. when the car gets hot(20 minute trip on freeway or hard driving around town), the exhuast sometimes smells like sulfur, which smells like rotten egg, so I figuring, catalyic convert. Is there any thing I can do to get rid of the egg smell instead of replacing. I know this lady lived half her life in Juarez MX, right next door. Sunny EL paso and Juarez are right next to each other, so someone told me she probably got bad gas and a fill up. Can a lower octane gas ruin a Catalitic convertor? Tony <edited><editID>T Lindau</editID><editDate>37964.0585416667</editDate></edited>

Rotten egg smell
 

A lot of times the sulfur content in different fuels can make the exhaust smell like rotten eggs. Try a tank of Chevron or Amoco premium and see what happens. I doubt the cat is bad, the other possibility is a bad O2 sensor but normally it's just the fuel your using. And don't use regular grade fuel, the car was designed for minimum 91 octane.