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re: exhaust smell: why?

>From Scott Mockry's web page:
 follow the link to exhaust 
The sulphur smell is actually caused by running the engine/cat convertor
slightly lean for long periods and then running under a rich condition (i.e.,
going up a hill under heavy load). This is when the sulphur smell is produced.
Under relatively lean conditions, the sulphur found in gasoline is converted
to sulphur trioxide, then during the rich running condition the sulfur
trioxide is converted into hydrogen sulphide (rotten egg smell) within the
catalytic converter.
Whether this is a good or bad thing, that I don't know.  Have never noticed
this odor from my car; what kind of fuel are you burning?  How many miles on
the oxygen sensor?
HTH, Chris Miller, Windham NH, c1j1miller@aol.com