2013 M3 Manual, Stalled at Stoplight when not in gear

[Bomb617]

I have an E92 6-speed base model at 47000 miles. For the last few months, the car will occasionally stall itself when I stop (usually at red light stop). At all time the car is in neutral with just foot on brake. It will just stall by itself. No start-stop engage (off at default for M3).

It happened to me a few times for the last few months (like once a month or couple months). Some other instances it will just drop in rev but regain idle without stalling. Anyone experience that in their 6-speed E9x? It is out of warranty.

BTW, no check engine light or anything, just stall and restart right away.

[drrust]

Does it happen just after filling with gas?

DIY: Replace Fuel Tank Breather Valve (Fix for bouncing idle at fuel station) https://www.m3post.com/forums/showthread.php?t=1273927

[New2Roundel]

I would scan the car if you can just to see if there are any codes you aren't aware of, but otherwise, sounds like a vacuum issue. Perhaps related to the brakes or other system.

[EJT86]

Probably fuel breather or a brake booster leak

[Bomb617]

Originally Posted by drrust

Does it happen just after filling with gas?

DIY: Replace Fuel Tank Breather Valve (Fix for bouncing idle at fuel station) https://www.m3post.com/forums/showthread.php?t=1273927

It happened at random, not particularly after fill-up! I will look into that fuel tank breather value fix.

[Bomb617]

Originally Posted by New2Roundel

I would scan the car if you can just to see if there are any codes you aren't aware of, but otherwise, sounds like a vacuum issue. Perhaps related to the brakes or other system.

Scan from BMW tech (for emission related repair beyond bumper to bumper warranty revel no hidden code.

[Bomb617]

Originally Posted by EJT86

Probably fuel breather or a brake booster leak

Will check for both, thanks!

[EJT86]

Originally Posted by Bomb617

Will check for both, thanks!

When you press the brakes does the RPMs dip or stall? If not replace the fuel breather it’s only $80

[spazzyfry123]

Similar symptoms as you with irregular occurrences. Did a smoke test and found it to be the fuel tank breather valve.

[Shaan]

Had the exact same issues. As everyone has said, it's most probably your fuel tank brother valve. worked for me.

[Bomb617]

Thank you all, will replace it and see what happen

[MJBO]

Originally Posted by Bomb617

No start-stop engage (off at default for M3).

Sorry for the OT question, but is that something you've coded or a US market thing?

Here in Aus, mine definitely defaults to on when restarting the car.

[Bomb617]

Originally Posted by MJBO

Sorry for the OT question, but is that something you've coded or a US market thing?

Here in Aus, mine definitely defaults to on when restarting the car.

I think this is default US setting to be off. It was like that since day one for me.

[Bomb617]

Originally Posted by Bomb617

Thank you all, will replace it and see what happen

After replacing the Fuel Tank Breather Valve for a month and a half, not a single stall happen with multiple fill-ups of gas. I hope that resolve the stalling problem.