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Rotten Egg Smell

WhoDey

By WhoDey
in 2020-2026 Silverado HD & Sierra HD

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WhoDey New Member

WhoDey

Posted
Posted

Just purchased a brand new Chevy 2500 Gasser. Has about 300 miles on it. Has a strong sulfur smell when driving with the windows down. Especially when accelerating quickly. No smell at idle or with the windows rolled up. No smell around exhaust pipe. Battery doesn't smell. No check engine light. Any ideas?

BuckWallace Enthusiast

BuckWallace

Posted
Posted

You sure it's not that normal "new engine" smell? New vehicles have a weird smell when oils/coatings on the engine burn off. It usually goes away after a month or so.

newdude Senior Enthusiast

newdude

Posted
Posted (edited)

Most likely its from the catalytic converters breaking in.  Also, if you had any undercoating done that may bake off a bit as well.  

Edited by newdude
Dunn Senior Enthusiast

Dunn

Posted
Posted

i had a weid smell tonight on way home from picking up my truck.....bought several before but this is first one I smelled something....IDK about rotten egg but a rotten something.......went away after awhile

  • 2 weeks later...
WhoDey New Member

WhoDey

Posted
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Posted

I only had the New Truck for about 100 miles. It's been at the dealership for service for a couple weeks now. Truck still smells like sulfur but they are denying the issue. General Motors advised me to take the truck to a different dealer for service.

ManyCamaroz Enthusiast

ManyCamaroz

Posted
Posted

I'm not sure of the composition of todays catalytic converters but in the old days the rotten egg smell was an inidcation it/they are failing/clogging up.

  • 4 weeks later...
davidm767 Enthusiast

davidm767

Posted
Posted (edited)

My truck had that problem a month ago, around 10k miles on a 2024. It went away. I have no idea why this problem came about, but it only lasted for a tank of diesel (really a tank and a half) so  maybe it was bad fuel? Not sure!? I've driven 2k miles and many tanks since (big road trip with trailer) and had zero issues since. EDIT: I just re-read that you had a gasser...maybe it is a CAT issue then, hopefully it will be a transient issue like mine was. 

Edited by davidm767
revrnd Senior Enthusiast

revrnd

Posted
Posted

I wonder if it's the fuel? W/ my 2017 I'd notice sometimes that the exhaust smell was off.

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