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Stan Corll

Stan Corll 10/7/2017

2014 Dodge Avenger SE 6 Cyl 3.60L


sulfur smell when I punch the gas.

I have a 3.6vvt and when I punch the gas and let off, I get a strong sulfur smell. 125000 miles with only regular oil changes. The car runs great and hangs with most v8's up to about 90mph. I'm assuming it has to do with fuel inj.

3 Answers


Jimm 10/8/2017

On some vehicles, a sulfur smell or 'rotten egg' odor may be noticed coming from the exhaust system. The odor
is usually noticed after a cold start, fast idle, extended periods of idling and full throttle acceleration. Sulfur smell
is not an indication of an engine concern and will not cause reduced drive-ability or durability of the engine or
any of its emission components.
The sulfur smell or 'rotten egg' odor is caused by high amounts of sulfur in the gasoline being used in the vehicle.
Sulfur is normally eliminated during the refining process, but the EPA regulation of sulfur in gasoline differs
from state to state. Vehicles using fuel containing high amounts of sulfur will most likely emit sulfur smell from
the exhaust system.
When high sulfur fuel is burned, there is a chemical reaction in the catalytic converter causing the sulfur to oxidize.
As the vehicle is driven, the oxidizing reaction odor in the converter will decrease with mileage and age.

Replacing the catalytic converter will not eliminate sulfur smell and replacement will just extend the
period of time needed for the converter to 'age' allowing it to reduce sulfur smell to an acceptable
Switch to a different brand of fuel and drive the vehicle for at least 100 miles. Monitor the decrease or
increase in sulfur smell.
Do not add any type of 'fuel additive' as this could add sulfur to the fuel and cause/increase the odor.
Try to avoid extended periods of short trip driving or aggressive acceleration.
Request information from your local fuel dealers on the amounts of sulfur in their gasoline. Try to use fuel
containing the lowest amounts of sulfur.
Visit the EPA and gasoline company websites to stay informed on any changes in fuel or environmental regulations.
A website to check is: www.gov.EPA


Nikkimerc 8/27/2019

You may have a bad catalytic converter

Teddy B

Teddy B 8/27/2019

The first thing I would think of with a Sulfur Dioxide smell from the Exhaust Converter,
would be an Overheated Exhaust Converter.

With 125,000 miles -- have you changed the Spark Plugs a couple times ? --I would have.
Do you have the Original Oxygen Sensors & have you looked at O2 Data on them ?
Is the Air Filter Clean ?
What does Fuel Trim Data tell you ?

Your mashing the pedal to the floor & causing a rich fuel condition for no reason,that if
done repeatedly can over heat the converter & thus the smell.

I wouldn't rule out a failing converter ---But --- you have lots of different test to perform
to confirm that & the smell should only be from overheating the converter from excess
fuel or questionable driving habits,for no reason. It is a 6 cyl not a Fun to play with V8 Hemi


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