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      05-24-2019, 03:07 PM   #1
Flying Low
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Drivetrain malfunction and low fuel

I started a track session with 1/2 tank of fuel. Track has 2 right hand long high speed turns that are close to each other. Right after second turn car went into limp mode with “Drivetrain Malfunction” warning, apparently due to lean fuel condition. I had over a 1/3 tank remaining. Put fuel in and all OK but can’ get rid of warning. I bought a Foxwell NT510 scanner/ reset tool but can’t get rid of the warning. Is this one of those warnings that I need to go to a dealer or independent?
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      05-24-2019, 06:44 PM   #2
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In my experience when the car has been starved for fuel in a turn, it always fixed itself pretty quickly. Typically within 1-2 corners at most. One of the vendors here would probably know, I'm thinking tom @ eas.
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      05-24-2019, 11:10 PM   #3
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This happened to my buddy at the track a few weeks ago. Turns out his charge pipe (I think) had come loose.

Take it to the dealership and have it checked out. Perhaps don't tell them that you were on the track when it happened. Lol
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      05-25-2019, 09:50 AM   #4
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The car runs great. When the charge tube comes loose there won’t be much boost.
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      05-25-2019, 05:08 PM   #5
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I had the same at NCM a while back, ran very low on fuel and I think it stalled and then threw that malfunction error. I fueled up the error stayed around for a few *days* I believe and then eventually went away. I never ended up going to the dealer or anything. Now I only run 2 sessions per tank that way I don't run into any issues.
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      05-29-2019, 08:54 PM   #6
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hows it now ? Im having same exact issue like this! Ive been running on low gas for a few days cause my company's gas allowance is being refreshed in 2 days. Long story short this keeps happening for the last 2 days. " Drivetrain malfunction ".
I always have my gas tank full probably 8 out of 10 from owning F82. Thanks for your help!!
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      05-30-2019, 01:20 PM   #7
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Still have the drivetrain malfunction. But it might be cleared by dealer because of a recent problem. I topped off my tank with 100 octane (about 6 gallons worth) the night before a track day. The next morning the car wouldn’t start. Flatbed to dealer and as I suspected, water in 100 octane. Waiting to see if comprehensive will pay. At least, the low pressure pump in tank and fuel filter need to be replaced. That’s around $1700.
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      05-30-2019, 02:00 PM   #8
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Quote:
Originally Posted by Flying Low View Post
Still have the drivetrain malfunction. But it might be cleared by dealer because of a recent problem. I topped off my tank with 100 octane (about 6 gallons worth) the night before a track day. The next morning the car wouldn’t start. Flatbed to dealer and as I suspected, water in 100 octane. Waiting to see if comprehensive will pay. At least, the low pressure pump in tank and fuel filter need to be replaced. That’s around $1700.
It took quite a while for mine to naturally reset itself. I even continued and finished my track event in the meantime.

Question, why were you running 100oct fuel? Can't remember all your posts, if you're tuned or not.
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      05-30-2019, 05:09 PM   #9
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Not tuned but M4 was tuned for 93 octane by BMW. So this gives me a little more performance, or at least that is the theory.
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      05-31-2019, 11:33 AM   #10
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Quote:
Originally Posted by Flying Low View Post
I started a track session with 1/2 tank of fuel. Track has 2 right hand long high speed turns that are close to each other. Right after second turn car went into limp mode with "Drivetrain Malfunction" warning, apparently due to lean fuel condition. I had over a 1/3 tank remaining. Put fuel in and all OK but can' get rid of warning. I bought a Foxwell NT510 scanner/ reset tool but can't get rid of the warning. Is this one of those warnings that I need to go to a dealer or independent?

I've had that happened to me too. It was summer time and I was pushing the car pretty hard on the track. The car went in limp mode and I pulled over to the side. I turned it on and off and the Drivetrain Malfunction light went away. But 20 seconds prior to that the "High Temperature Transmission" light also came on. Once the car cooled off, I continued tracking and the car was fine. Strange that yours stayed on, I'd get it check.
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      05-31-2019, 11:05 PM   #11
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I got the car back today. They dropped the fuel tank to clean it out. Seems like they could have cleaned it out from the top. They installed new low pressure pump assembly and fuel filter. Seems to run fine. They also cleared the drivetrain malfunction warning. Sure hope this doesn’t happen again.
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      06-07-2019, 12:11 AM   #12
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Where/how did the 100 octane have water in it??
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      06-08-2019, 12:10 AM   #13
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Pahrump NV near the Spring Mountain track.
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      06-09-2019, 06:05 PM   #14
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Quote:
Originally Posted by Flying Low View Post
Pahrump NV near the Spring Mountain track.
Thanks flying low, this is really good information. Was it a brand name gas station? Really want to avoid.

I’ve only bought 100 octane from Laguna Seca and Sonoma and no issues, but planning SoCal and surrounding track days soon.
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