Rotten egg smell in cabin

Sleeper340i · 05-21-2021, 10:00 PM

I've been having this rotten egg smell ever since I started E40 tuning. Could my leaky valve cover gasket be causing this smell? Don't think burning oil would smell like rotten eggs though. I'm thinking also injector going bad maybe? Smell does happen on pump too but it is a different type of smell.

Wasn't worried too much about it till I smelt it 3x today during a drive when it's usually only once. Would make complete sense to me if the valve cover gasket leak is getting worse hence why I smelled it even more often today.

BTW: running a catless downpipe so it can't be my cat converter going out.

G.Newt · 05-21-2021, 10:09 PM

Rotten egg smell is usually a failure somewhere in the fuel system since you have no cats. Possibly an injector.

Sleeper340i · 05-21-2021, 11:14 PM

Quote:

Originally Posted by G.Newt

Rotten egg smell is usually a failure somewhere in the fuel system since you have no cats. Possibly an injector.

I was highly suspecting the injector as well. Do you think the injector going bad could also create some weird clicking noise in the engine bay? Sound gets loud during morning starts and louder after pulls too when stopped at a light afterwards. (Sound also gets quieter when running E) Don't believe it's my HPFP as that's a different ticking sound.

les anderson · 05-24-2021, 09:39 PM

What about the battery?

05-21-2021, 10:00 PM	#1
Sleeper340i Second Lieutenant 97 Rep 255 Posts Drives: BMW 340i Join Date: Nov 2019 Location: Seattle iTrader: (0)	Rotten egg smell in cabin I've been having this rotten egg smell ever since I started E40 tuning. Could my leaky valve cover gasket be causing this smell? Don't think burning oil would smell like rotten eggs though. I'm thinking also injector going bad maybe? Smell does happen on pump too but it is a different type of smell. Wasn't worried too much about it till I smelt it 3x today during a drive when it's usually only once. Would make complete sense to me if the valve cover gasket leak is getting worse hence why I smelled it even more often today. BTW: running a catless downpipe so it can't be my cat converter going out.
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05-21-2021, 10:09 PM	#2
G.Newt Major 810 Rep 1,456 Posts Drives: CT4-V Blackwing 6MT Join Date: Feb 2017 Location: CO -> TX iTrader: (0)	Rotten egg smell is usually a failure somewhere in the fuel system since you have no cats. Possibly an injector. __________________ 2022 CT4-V Blackwing 6-speed SOLD: 2016 340i xDrive 6-speed DAW v2.5 turbo E40 \| Dorch S2 \| VRSF DP \| MST intake \| AWE catback \| 335is clutch \| CSF heat exchanger \| RK Autowerks intake manifold \| Orange M Perf Brake Kit \| KW Street Comfort coilovers \| GTS taillights V2
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05-24-2021, 09:39 PM	#4
les anderson Second Lieutenant 147 Rep 201 Posts Drives: 340i Join Date: Jan 2019 Location: Miami iTrader: (0)	What about the battery?
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