2014 sierra 5.3 smells like propane

[Bstith03]

Hello. I have a 2014 5.3 4x4 30k miles and have a smell of propane off and on when driving. It does it everytime I drive and you get whiffs of the smell. Of course the dealer cant get it to smell and my warranty is out in 2 weeks. Any ideas would be great. Thank you

[arkenzo]

propane or coolant?

[Bstith03]

It smells of propane. Truck isnt overheating or running any different.

[x219c]

Are you flooring it before you notice the smell? In Toyota vehicles, they will often smell like eggs after driving in a spirited fashion. Something to do with dumping gas in the cat or something.

 

I haven't experienced this in my Chevy, but who knows.

 

 

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[silveradosid]

is the smell inside or outside of the truck, if inside you might be smelling a small freon leak coming threw the heater

[Bstith03]

The smell is on the outside coming in. It was first noticed when i was towing my weekend warrior so wasnt floring it but it was under a load. Now it just doesbit all the time.

[BigBadSierra]

Check and see if the transmission is leaking or got hot and blew some fluid out of the vent.

 

When Transmission fluid gets hot it tends to give of this type of smell.

 

Check the seals on it as well.

[Garykk]

If it's outside then I would suspect the cat, Toyotas had this problem years ago, they finally had a recall on it, something to do with ecm. My Father had one of the Toyotas, stunk like hell in his car.

[EFLine]

Going to keep an eye on this thread as I started having the same issue two weeks ago and thought I was going crazy or it was a truck around me, surrounding industrial plant, but this peaked my interest

[Bstith03]

They had the truck for a week and couldnt get it to duplicate the smell. I havent driven it much since i got it back but im sure it will still happen.

[cruser7]

My Chevy 2017 tahoe (25,000 miles) smelled of propane after driving a short distance , after months of searching. Its was coming from the differentials, believe it or not. So far the dealer at this time has no repair, but is researching it. (I was the one who finally found it), when I showed it the dealer.

[cruser7]

I will follow up on a repair answer when I get one. Stay tuned

[Brianibew]

On 4/19/2017 at 4:56 PM, Bstith03 said:

Hello. I have a 2014 5.3 4x4 30k miles and have a smell of propane off and on when driving. It does it everytime I drive and you get whiffs of the smell. Of course the dealer cant get it to smell and my warranty is out in 2 weeks. Any ideas would be great. Thank you

Try switching fuels from whatever your running currently.  If it’s e10, then run ethanol free for a few tanks and vise-versa.  It also may be the station you are getting your fuel from...try a different station for a while.

[Sierra Dan]

Mine smells like Moonshine.....  great advantage of running E-85!  

[cruser7]

I found my propane smell, and fixed it. Coming from the front differential vent. I changed the fluid, rerouted the vent line to the rear of the vehicle up by the gas cap door and installed a inline gas fliter. Smell has disappear. Sound crazy, but its gone thank god.