I'm posting this question on behalf of my son. He drives a 97 Toyota 4-Runner,V-6,2 wheel drive, with over 100K miles. He has kept the car well maintained with oil changes, tune-ups, etc. done per owners manual intervals.
Over the last year he has noticed a "sulfur" smell from his exhaust. It began slowly, but has steadily gotten worse. We have tried suggestions from many sources, but the problem still exists. So far he has tried the following: Ran a higher grade gas (premium) for several weeks...used fuel injector treatments in the gas...changed spark plugs and wires...and had the timing belt replaced. None of the above have given any noticeable change. When he first told me of the problem I suspected the catalytic converter, but several mechanics and exhaust shops have told me the cat probably isn't the problem.
All thoughts and advice are much appreciated.
Over the last year he has noticed a "sulfur" smell from his exhaust. It began slowly, but has steadily gotten worse. We have tried suggestions from many sources, but the problem still exists. So far he has tried the following: Ran a higher grade gas (premium) for several weeks...used fuel injector treatments in the gas...changed spark plugs and wires...and had the timing belt replaced. None of the above have given any noticeable change. When he first told me of the problem I suspected the catalytic converter, but several mechanics and exhaust shops have told me the cat probably isn't the problem.
All thoughts and advice are much appreciated.