Rotten Eggs

[launieg]

Lately, the smell of sulphur has been getting worse. I suppose it is from the cat, but I'm wondering why it is getting worse? I should know the answer to this from the many stinky cats (no offense to you kitty's) I drove in decades ago, but my memory has conveniently blotted out that information! By the way, I do have floorboard holes, but they are not any worse than a month ago, and this is definitely worse. I don't mind much; it reminds me of the sulfur hot springs we used to swim in when I was young, but I am thinking my wife is going to object the next time I take her out for a drive.

[majicwrench]

All gas has some sulfer in it, some worse than others. Anything that makes your car run rich or poorly will also result in more sulfer smell. Without doing some research I can't comment much further, other than to add that the convertor is not the problem.
Keith

[kmead]

Sounds like it is running rather rich. The cat is doing its best to convert the gases but is getting overwhelmed. This can cause it to overheat and eventually melt. I would look into seeing why its running so rich.

[launieg]

Yes, I have been thinking that it is running rich. Would a bad O2 sensor cause it to run rich when hot?

[launieg]

I guess it could also be due to abnormally high fuel pressure. I last found it was 50 psi, which I know is too high, but I figured it was just my poor quality gauge. I'll either test the pressure with a different gauge or swap out the regulator and see if that makes a difference. A stuck AFM could do it too, I'm guessing. Any other ideas? Thanks all.

[So Cal Mark]

check for a leaking pressure regulator and the resistance of the temp sensor. The O2 sensor won't have much affect on your system

[mdrburchette]

You might also want to check your battery. It can emit a sulfur smell too.