Propane smell - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Ft86Chris · 12-11-2023, 10:59 PM

Hey folks. I have a 2014 frs

I've got an unrulling rotten egg / propane smell once the car is warm

I've been battling this a while. The first thing I did was change the cat. I went with an lachute high flow cat.

I've since retuned the car.

The car had its engine built a few years ago, eagle rods, ACL bearings Apr head bolts stock compression and crank.. baffled pan, greedy pick up.

Full exhaust.

The engine leaks a lot. The engine builder hasn't been helpful and hasn't fixed it. I plan to pull in the spring and fix the leaks.

Before the smell started I changed a coil pack, ( no 1 ), I had a track day and used an octane booster and later used a fuel system cleaner. It was fine during that period.

After a few weeks following these events the smell started. My first action was changing the cat. Still no luck. Would anyone have any ideas? Car runs well, tune looks good. No cel codes. Battery isn't leaking..

Ashikabi · 12-11-2023, 11:01 PM

Cabin air filter?

Sent from my KB2007 using Tapatalk

RToyo86 · 12-11-2023, 11:09 PM

The smell is on the outside. I Can confirm the air around the car does indeed reek of a propane like scent.

Ft86Chris · 12-11-2023, 11:20 PM

Quote:

Originally Posted by Ashikabi

Cabin air filter?

Sent from my KB2007 using Tapatalk

Even changed the filters, it's outside mostly

EndlessAzure · 12-12-2023, 02:14 AM

Quote:

Originally Posted by Ft86Chris

Hey folks. I have a 2014 frs

I've got an unrulling rotten egg / propane smell once the car is warm

I've been battling this a while. The first thing I did was change the cat. I went with an lachute high flow cat.

I've since retuned the car.

The car had its engine built a few years ago, eagle rods, ACL bearings Apr head bolts stock compression and crank.. baffled pan, greedy pick up.

Full exhaust.

The engine leaks a lot. The engine builder hasn't been helpful and hasn't fixed it. I plan to pull in the spring and fix the leaks.

Before the smell started I changed a coil pack, ( no 1 ), I had a track day and used an octane booster and later used a fuel system cleaner. It was fine during that period.

After a few weeks following these events the smell started. My first action was changing the cat. Still no luck. Would anyone have any ideas? Car runs well, tune looks good. No cel codes. Battery isn't leaking..

Quote:

Originally Posted by RToyo86

The smell is on the outside. I Can confirm the air around the car does indeed reek of a propane like scent.

The only thing on the car I think smells like this is gear oil. Gear oil contains sulfur compounds, which is notorious for bad egg smell.

Check your transmission and differential. Likely:

The transmission rear seal (where the driveshaft connects)
Blow-over from the transmission vent hole (near the top of the case)
Axle shaft seals (differential casing sides)

However there are other possible joints, so look around the whole transmission and differential casing to see if it's wet with gear oil anywhere. If you see any sheen, dab some up with your finger and smell it. It's not a smell you can mistake

x808drifter · 12-12-2023, 04:37 AM

Quote:

Originally Posted by EndlessAzure

The only thing on the car I think smells like this is gear oil. Gear oil contains sulfur compounds, which is notorious for bad egg smell.

Check your transmission and differential. Likely:

The transmission rear seal (where the driveshaft connects)
Blow-over from the transmission vent hole (near the top of the case)
Axle shaft seals (differential casing sides)

However there are other possible joints, so look around the whole transmission and differential casing to see if it's wet with gear oil anywhere. If you see any sheen, dab some up with your finger and smell it. It's not a smell you can mistake

^ That
Not just the bolded part. But emphasis on the bolded part.

Ft86Chris · 12-21-2023, 08:01 PM

Solved!

Bad gear oil in the diff. Thanks everyone

12-11-2023, 10:59 PM	#1
Ft86Chris Winter ***e engaged Join Date: Sep 2014 Drives: Ashpalt 2014 Frs Manual Location: Ottawa, Ontario Posts: 335 Thanks: 351 Thanked 104 Times in 66 Posts Mentioned: 7 Post(s) Tagged: 0 Thread(s)	Propane smell Hey folks. I have a 2014 frs I've got an unrulling rotten egg / propane smell once the car is warm I've been battling this a while. The first thing I did was change the cat. I went with an lachute high flow cat. I've since retuned the car. The car had its engine built a few years ago, eagle rods, ACL bearings Apr head bolts stock compression and crank.. baffled pan, greedy pick up. Full exhaust. The engine leaks a lot. The engine builder hasn't been helpful and hasn't fixed it. I plan to pull in the spring and fix the leaks. Before the smell started I changed a coil pack, ( no 1 ), I had a track day and used an octane booster and later used a fuel system cleaner. It was fine during that period. After a few weeks following these events the smell started. My first action was changing the cat. Still no luck. Would anyone have any ideas? Car runs well, tune looks good. No cel codes. Battery isn't leaking.. __________________ 2014 Asphalt MT FR-S Ecutek custom tune, Bolton's and Sticky tires.

12-21-2023, 08:01 PM	#7
Ft86Chris Winter ***e engaged Join Date: Sep 2014 Drives: Ashpalt 2014 Frs Manual Location: Ottawa, Ontario Posts: 335 Thanks: 351 Thanked 104 Times in 66 Posts Mentioned: 7 Post(s) Tagged: 0 Thread(s)	Solved! Bad gear oil in the diff. Thanks everyone __________________ 2014 Asphalt MT FR-S Ecutek custom tune, Bolton's and Sticky tires.

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12-11-2023, 11:01 PM	#2
Ashikabi Senior Member Join Date: Aug 2014 Drives: 2013 FR-S Location: Northwest Iowa Posts: 7,359 Thanks: 454 Thanked 4,548 Times in 2,950 Posts Mentioned: 59 Post(s) Tagged: 5 Thread(s)	Cabin air filter? Sent from my KB2007 using Tapatalk

12-11-2023, 11:09 PM	#3
RToyo86 Senior Member Join Date: Mar 2018 Drives: 17 Asphalt 86 Location: Ottawa Posts: 2,269 Thanks: 1,800 Thanked 2,394 Times in 1,204 Posts Mentioned: 15 Post(s) Tagged: 0 Thread(s)	The smell is on the outside. I Can confirm the air around the car does indeed reek of a propane like scent.

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