Question about Jeep Grand Cherokee

2 Answers

In the last several months and on two occasions when starting my car I smell a sulfer kind of order.

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  • William Guenther Sep 03, 2010

    There is a sulfur odor when I start my 1999 Jeep Grand Cherokee. could it be the catyalitic converter?

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  • Master
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Usually the rotten egg or sulfur type smell is a good sign that the CAT is starting to plug up and is on the way out. A muffler shop can tell you if it is good or bad by using a infrared heat gun... if the CAT has cold spots, it has gotten plugged and needs to be replaced. But its not always possible that the catalytic converter is faulty and causing this.Many a times its fuel related problem.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 driveability 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.
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
level.

  1. Switch to a different brand of fuel and drive the vehicle for at least 100 miles. Monitor the decrease or
    increase in sulfur smell.
  2. Do not add any type of 'fuel additive' as this could add sulfur to the fuel and cause/increase the odor.
  3. Try to avoid extended periods of short trip driving or aggressive acceleration.
  4. 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.
Thanks. Keep updated for any more query. You can rate this solution and show your appreciation

Posted on Sep 03, 2010

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  • Jeep Master
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This smell is usually generated by a worn out clutch - you should have your transmission checked. 
But in the last year this smell has become way more common than before: the additives from the gas don't mix very well with the additives from the oil and when they burn in the cylinder you end up with that - the only thing you can do is to replace the brand of gas you are using.

Posted on Sep 03, 2010

  • Azrael SRL Sep 04, 2010

    No, it can't be it , unless it's completely worn out and no longer doing its job of purifying the gases.

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