Sulfur smell

[Dave__P]

Hi all,

Had my oil changed, front and rear diffs and transfer case serviced a few weeks ago. Filled up 91 at my normal gas station, threw in some injector cleaner and took off.

In about 100 miles or less, started to get an awful sulfur smell. No CEL or red flags on the instrument panel. Called the shop that did the service and they thought it was build up on the cat...have a Borla S Type exhaust.

2019 with 40k miles on the truck.

Wondering if anyone has experienced this before? With my research it's either build up on the cat as explained by the shop, off gas from the battery but the voltage is good. Any other thoughts or solutions?

Thanks!

 

[Old-Raptor-guy]

Battery

 

[Sunchild714]

Unless you were driving behind any Toyota, I would say battery is your culprit as well.

 

[CleverGirl_]

Unless you were driving behind any Toyota, I would say battery is your culprit as well.

Former 4th gen 4runner owner, yep lol

 

[Ruger]

Well, where is the smell coming from? Under the hood, from the exhaust, inside the cab...?

 

[Keith88]

https://my.clevelandclinic.org/health/diseases/4342-irritable-*****-syndrome-ibs

 

[thatJeepguy]

Its the diff fluid. Check the breather hose.

 

[Zeusmotorworks]

Its the diff fluid. Check the breather hose.

They could have over filled the diff(s)... and/or left a mess all over and under with the used oil.

 

[thatJeepguy]

Diff fluid has more group 1 and 2 oils which have a higher aromatic content…

They could have over filled the diff(s)... and/or left a mess all over and under with the used oil.

i just did my rear and the garage still has that smell weeks later …

 

[SCAR911]

How on earth can a battery or diff fluid smell like rotten eggs? Lol