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      09-28-2016, 07:37 PM   #1
JayL
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Engine cutting out on the track

Took my 07 Z4M to the track today. In the middle of the second session the engine would completely shut off while under load. There weren't any dash lights on after this happened. I had to stop and restart the car and it appeared to be fine until it happened again.

Each time it happened in a turn following a hard braking zone. The car is stock with the exception of M track mode being coded in. This was in use when this happened. Outside of that, oil temp at 225, outside temp around 90 and just over 1/2 tank of gas.

Any thoughts?
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      09-28-2016, 07:44 PM   #2
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I'm having the exact same issue at the track under your same conditions. I do not think I could duplicate my problem on the street because of the constant load the engine is under while at the track. I suspect my issue may be a fuel delivery problem because as soon as I put fuel in the car and bring the tank above a half tank the problem goes away.

Last edited by longress; 09-28-2016 at 08:10 PM.
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      09-28-2016, 07:53 PM   #3
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Nothing to suggest. Any codes stored at all?
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      09-28-2016, 07:59 PM   #4
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No codes, filling it up now and will try another session.
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      09-28-2016, 08:23 PM   #5
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Full tank of gas, same issue.

Both m track mode on and off had the same issue. Another BMW guy noticed the battery wasn't an oem battery, does that matter in these cars? Wouldn't that be an issue at other times as well?
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      09-28-2016, 08:44 PM   #6
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My engine only completely died once but it would cut out and fall on its face on the throttle coming out of a corner after a long straight then just continue to do so more frequently with each lap. I mean like 4-5 seconds to recover before I had any throttle.

Does your car act like you just turned the ignition off or does it cut out?
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      09-28-2016, 08:55 PM   #7
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It acts like I completely turned the ignition off.
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      09-28-2016, 11:02 PM   #8
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If it was the battery you'd think it wouldn't crank to start. But then again some of these fail pretty weird but easy enough to test.
I ordered a pump and filter. I had ran the car darn near out of fuel on two occasions so I may have damaged my pump.
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      09-28-2016, 11:44 PM   #9
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Happened to me one day driving home on day under load. My alternator was showing symptoms of failing prior and I was waiting for the replacement unit. I'm at 91k.
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      09-29-2016, 12:49 AM   #10
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Aggressive DSC
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      09-29-2016, 03:02 AM   #11
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Crazy thought? Short of some kind induced by heavy Gs in braking?
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      09-29-2016, 09:16 PM   #12
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Just a quick update, it appears that one of the o2 sensor wires touched the header and melted the insulation on the wires. Looks like it was only moving enough to cause issues under cornering. Unfortunately I won't know for certain until I get it back out on the track.

I would have expected this sort of thing to light up the dash as the car freaked out rather than cutting the engine. Not even sure how this would happen, but I suspect when the sensors were swapped out a zip tie was used to hold it away from the header.
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      09-29-2016, 09:25 PM   #13
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Definitely a big surprise it didn't throw a CEL!
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      09-29-2016, 09:49 PM   #14
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Quote:
Originally Posted by JayL
Just a quick update, it appears that one of the o2 sensor wires touched the header and melted the insulation on the wires. Looks like it was only moving enough to cause issues under cornering. Unfortunately I won't know for certain until I get it back out on the track.

I would have expected this sort of thing to light up the dash as the car freaked out rather than cutting the engine. Not even sure how this would happen, but I suspect when the sensors were swapped out a zip tie was used to hold it away from the header.
What do I win with my wild *** guess?
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      09-30-2016, 09:03 AM   #15
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^

.....out to check my O2 wires
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      09-30-2016, 09:38 PM   #16
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I can't help but wonder if this was something which was already wrong with the car prior to the track day but wasn't the cause of the issue. I played around with the o2 sensor wire and there doesn't appear to be enough slack to allow it to even hit the header. There's enough play in the wire for it to appear like it would move but when actually trying to move the wire it wouldn't quite get there. I'm thinking it was a problem for the previous owner of the car and upon moving it away from the header the car ran fine (I drove it home from the track last night without issue prior to finding out the wire had a problem).
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      10-03-2016, 08:23 AM   #17
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It is a fueling issue, I had the exact same problem on my supercharged track car due to inadequate injector size( no CEL or stored code ) . While your injectors are likely not the culprit there is an issue somewhere in the system . Common things being common and the mileage on your car I would replace your fuel filter and check your fuel pressures . If you have a damaged primary 02 sensor there will be a code stored and it wouldn't be intermittent .
My two cents
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      10-10-2016, 11:45 AM   #18
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This weekend I went to put in my new filter and pump that I had ordered to address a fuel starvation issue at the track and quickly found the culprit - the pump had come out of the bracket that it clips into at the bottom of the tank and managed to fall over inside the tank. I had noticed that my fuel gauge seemed to drop at a weird rate and now it all makes sense.

I replaced these parts even though they were probably still good. I figured I was in there I might as well.

This is the picture looking inside the tank opening, note that the pump should be at a 90 degree angle (straight up).
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      10-10-2016, 12:11 PM   #19
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Glad you sorted it.
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      10-10-2016, 12:43 PM   #20
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Quote:
Originally Posted by longress View Post
This weekend I went to put in my new filter and pump that I had ordered to address a fuel starvation issue at the track and quickly found the culprit - the pump had come out of the bracket that it clips into at the bottom of the tank and managed to fall over inside the tank. I had noticed that my fuel gauge seemed to drop at a weird rate and now it all makes sense.

I replaced these parts even though they were probably still good. I figured I was in there I might as well.

This is the picture looking inside the tank opening, note that the pump should be at a 90 degree angle (straight up).
I haven't seen this issue before.
Great info!
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      10-10-2016, 04:29 PM   #21
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Quote:
Originally Posted by angelr View Post
Glad you sorted it.
Thank you!
It was a wild ass guess without any diagnosis when I ordered a pump and filter. I would of had to of ran around with a fuel pressure gauge hooked up when the problem was occurring to see it but I figured it had to be fuel.


Quote:
Originally Posted by inTgr8r View Post
I haven't seen this issue before.
Great info!
Yeah I searched for pump issues thinking I would find someone that had a bad pump but I never found anything let alone something like I found and it wasn't encouraging when I went to order a pump and the BMW store had to get one from the warehouse because none of the stores in the area had one! That tells me they don't stock them becaue they don't install them often.

I've been racking my brain to figure out how this happens and I think it comes down to a few possibilities -

1. Missed incorrect install from the factory
2. Pump was knocked out of the bracket when the previous owner was hit in the rear.
3. Some how it came loose from banging the curbs on the race track which is probably unlikely since people on the forum track their cars all the time
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