RJC

Hi Dave,

Noticed a sulphur smell from the exhaust of my clk 500 after pulling in my garage, I don't know if I got a tank of poor quality fuel or something is wrong with my car. I've got about 700 miles on the car and started noticing the smell earlier this week, no malfunctions showing. I filled up with fuel from a different station just before I got home tonight, I'm hoping this clears it up. It's interesting when I got home from dinner earlier tonight the smell was there, about an hour later I went out for another short drive and no smell at all.

Thanks

mbtech208

There's an anti-corrosion coating they put on the exhaust at the factory, which burns off over the first thousand miles or so of driving. This may be what you smell.

RJC

Dave,

Smell is definetly coming from out of the exhaust pipe and I been noticing it just this week. I have no check engine or malfunction lights. The smell comes and goes. If I have an O2 sensor out of whack or running too rich would I not have a malfunction/check engine light on?

Thanks

Mike T.

I'm almost certain that it's just the high-sulphur fuels that we suffer from in North America.

In normal driving, some of the sulphur precipitates on the cat's honeycomb, and then when the cat really warms up a lot due to a richer mixture (such as when climbing a hill), the sulphur is burned off the honeycomb and you or at least the cars following you can smell it.

Is there a hill that you drive up right before your home? If so, that would explain it.

RJC

No hills down here in S. FLA but I've also read about what you note above. I've switched gas and I'm hoping it goes away. Thanks for the post.