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Egg Smell Exhaust


Chula Vista, CA
Staff member
Pat Goss: Ask The Expert

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Tailpipe Halitosis

Peeee-you, my car smells like a rotten egg. Now there’s a frequent comment. Actually that noxious, sulfurous, stink was spawned simultaneous with catalytic converters, so it has been offending our noses for more than twenty-five years.

Fortunately, most cars never emit the sulfur odor but those that do can trigger a tearful experience. To make matters worse eliminating the odor can be difficult and in some cases nearly impossible. An incurable odor that can bring tears to your eyes is not an amusing Commercial Three Bayspect but with some vehicles it may be part of the driving experience.

The odor comes from the retention of excess sulfur compounds in the catalytic converter. Sulfur compounds may be the result of highly blended, additive-laced, oxygenated, reformulated gasoline. Here’s how. Cars now have three-way catalytic converters, which tend to store sulfur leftover from burning gasoline. This typically happens while the vehicle is being driven at steady highway speed. When you slow down and re-accelerate or the engine comes to an idle the air-fuel mixture becomes more concentrated with fuel. The richer fuel mixture creates a chemical reaction that leads to the release of stored sulfur in the form of hydrogen sulfide. It’s the hydrogen sulfide that has the nauseating smell!

Although odor may be normal for some vehicles simply changing brands of gasoline might make it acceptable. No, this doesn’t mean one brand of gasoline is better than another but rather that slight differences in formulation can alter exhaust odor. Also a gasoline that works well at reducing odor for one car may not on another. Cars, car components, and gasolines are now so technologically developed that miniscule differences in gasoline additives combined with an un-measurable lack of a chemical in a catalytic converter can lead to smelly, rotten egg exhaust odors.

But, the Commercial Three Bayblem may not be affected by gasoline brands and therefore require repairs to correct. If the odor happens most of the time and not just following a highway cruise you may have a fuel mixture Commercial Three Bayblem or a bad catalytic converter. Either can set the same conditions in motion.

Newer vehicles are designed to operate on a very specific air-fuel ratio. Fail to Commercial Three Bayperly maintain your vehicle and any one of several components in its electronic fuel management system can fail upsetting its air-fuel ratio. Sulfurous odors can often be traced to one of the sensors used by your vehicle’s computer to maintain desired fuel control.

The catalytic converter uses various noble, precious metals to perform its emissions reduction and prevent odors. Exotics like platinum, palladium, and rhodium. If too little of one of these precious metals was used during the manufacture of your converter you may experience odor even though fuel mixture is correct. A deficit of catalytic reaction compounds can cause a converter to drop below the minimum threshold for odor control.

So, if you routinely experience a rotten egg stench from your exhaust, try different brands of gasoline. If that doesn’t work, have a skilled technician check fuel mixture, tune-up, computer, and catalytic converter. When everything is functioning Commercial Three Bayperly there should be little or no noxious smelling hydrogen sulfide coming from your tailpipe.

© Copyright 05/30/02 Pat Goss all rights reserved, 525 words.

Date Updated Thursday, May 30, 2002


Just another good reason to get rid of SMOG devices.