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Old 06-07-2003, 01:31 AM
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Join Date: Oct 2002
Location: Raymond, Wa
Posts: 16
rotten egg odor?

OK...6 months ago my check engine light came on in my 1993 300E. After checking things out, and con\sidering it had just hit 80,000 miles, I replaced the oxygen sensor and reset the light. It stayed off fo 2 months and then came back on. Mileage has stayed at a constant 26-28mpg and it runs great. Today my wife mentioned that the car had a heavy duty rotten egg odor under hard pulls like accelerating up hills. Catalytic convertor? Any thoughts?
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Old 06-07-2003, 02:02 AM
BenzMatic's Avatar
You can do it
Join Date: Jun 2003
Location: OC S. California
Posts: 120
It does sound like Catalyst Converter.
87 420 SEL
Looking for a nice mid 80's MB diesel.
87 BMW 528e (Sold)
99 TOYOTA 4Runner
1989 Honda Accord (Sold)
1988 Honda Accord (Total)
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Old 06-07-2003, 11:04 AM
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Join Date: Jul 2001
Posts: 613
yep, thats the smell you get if you run with no cat, my bet is that it needs to be replaced.
1993 500E
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Old 06-07-2003, 11:29 AM
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Join Date: Sep 2002
Posts: 2,485
The smell is definitely being caused by the catalytic converter but that doesn't mean it's bad. It could be reacting to fuel with higher than normal sulfur content. I used to hear this complaint quite often in the early nineties. You say the car runs good, with no loss of fuel economy or power. That eliminates a clogged cat. If the car will pass an exhaust emissions test I'd forget about the cat, unless of course the odor is unbearable. You might try changing the brand of fuel you're using to see if there's any change.
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Old 06-07-2003, 12:18 PM
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Join Date: Feb 2003
Location: Ontario, Canada
Posts: 3,160

I am with you on that theory 100 %.
Smelly cats are usually high sulphur fuel, ignition misfires, or too much fuel.
Since his mpg is so good, your suggestion sounds right on the money.
2007 C 230 Sport.
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Old 06-07-2003, 09:58 PM
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Join Date: Jan 2002
Location: England
Posts: 1,841
It's fairly normal for this to happen on a catalyst car, but did anyone notice how Volvo's seem to do it pretty badly?
2.5-16v 1990 90,000m Astral Silver
2.0E 8v 1986 107,000m Black 2nd owner
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