JB4 shuts off then on while driving?

hetzle · 04-10-2012, 06:32 PM

Let me begin by saying that I didn't quite realize the first time it happened, but it's happened twice more recently, 3 times in total over about 7 weeks. WHat happens is this:

I'll be driving along, giving it a little bit of gas (10%) in 5th or 6th and suddenly I'll feel a super tiny jerk (like the throttle stopped responding and then immediately responded again) and my gauges will do the full startup sweep since I have that option enabled. It's only for a split second though, it honestly didn't interfere with my driving at all but it's pretty weird

Any ideas on the cause?

Mike@N54Tuning.com · 04-10-2012, 06:46 PM

You either have older firmware that was bugged, or have a loose CAN wire in the DME box. Most recent firmware is posted in BMS' forum in the N55 sticky. I'd try that first.

Mike

518N55 · 04-10-2012, 07:26 PM

I had that exact issue too, firmware fixed it.

Option (2)

If your can wires are smudged up with that black stuff in the connector cap it could be messing with the connection. A little rubbing alcohol on a rag will take care of it easily.

hetzle · 04-10-2012, 08:46 PM

Thanks I'll check it out

04-10-2012, 06:32 PM	#1
hetzle First Lieutenant 32 Rep 373 Posts Drives: E90 335i Join Date: Dec 2011 Location: San Francisco, California iTrader: (0)	JB4 shuts off then on while driving? Let me begin by saying that I didn't quite realize the first time it happened, but it's happened twice more recently, 3 times in total over about 7 weeks. WHat happens is this: I'll be driving along, giving it a little bit of gas (10%) in 5th or 6th and suddenly I'll feel a super tiny jerk (like the throttle stopped responding and then immediately responded again) and my gauges will do the full startup sweep since I have that option enabled. It's only for a split second though, it honestly didn't interfere with my driving at all but it's pretty weird Any ideas on the cause? __________________ 2011 335i sedan 6MT, 515whp/530wtq. Pure Turbo Stage 2, Motiv SST TwinDisk Clutch/FW, Motiv Flash, AA 4" DP, ER FMIC, AA turbo-back exhaust, Quaife LSD, ST Coilovers, BMS Intake, UUC DSSR+SSK, ER CP, BMS CDV, BMS OCC, Arkym CF trunk
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04-10-2012, 06:46 PM	#2
Mike@N54Tuning.com Joint Chiefs of Staff 4907 Rep 115,980 Posts Drives: 2007 335i, 2015 M3 Join Date: Dec 2008 Location: N54tuning.com iTrader: (89)	You either have older firmware that was bugged, or have a loose CAN wire in the DME box. Most recent firmware is posted in BMS' forum in the N55 sticky. I'd try that first. Mike
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04-10-2012, 07:26 PM	#3
518N55 Enlisted Member 1 Rep 38 Posts Drives: 2011 335i coupe Join Date: Mar 2012 Location: Upstate NY iTrader: (0)	I had that exact issue too, firmware fixed it. Option (2) If your can wires are smudged up with that black stuff in the connector cap it could be messing with the connection. A little rubbing alcohol on a rag will take care of it easily.
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04-10-2012, 08:46 PM	#4
hetzle First Lieutenant 32 Rep 373 Posts Drives: E90 335i Join Date: Dec 2011 Location: San Francisco, California iTrader: (0)	Thanks I'll check it out __________________ 2011 335i sedan 6MT, 515whp/530wtq. Pure Turbo Stage 2, Motiv SST TwinDisk Clutch/FW, Motiv Flash, AA 4" DP, ER FMIC, AA turbo-back exhaust, Quaife LSD, ST Coilovers, BMS Intake, UUC DSSR+SSK, ER CP, BMS CDV, BMS OCC, Arkym CF trunk
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