2011 N55 335 stutter and stall

WULFFZA · 02-07-2015, 06:43 AM

Apologize for not searching, didn't see the function on the app.

My E90 with 40,000 miles began a new trick over the last month. When idling at a traffic light and when warm the revs will dip to 500rpm or so, idle rough and return to normal. It'll only happen once during a trip. A couple of days ago it stalled completely. It have experienced occasional long cranks for the past couple of years and mentioned it at services but they haven't proposed a fuel pump replacement.

Is this likely the fuel pump or gunk in fuel filter?

norsairius · 02-07-2015, 11:02 AM

I've read of a number of different things that could cause this around these forums. They include:
-HPFP / LPFP
-Fuel injectors
-Coil packs
-Spark Plugs

I had an issue with long cranks as well and it turned out to be the HPFP. I didn't have any of the other symptoms you mentioned though.

I've had no issues since the HPFP got replaced in my car. I've started it in negative temps outside after the car's sat out all day with no problems aside from the slightly longer crank due to the cold, but nothing near as bad as it was before the pump got replaced.

If you think it could be gunk in the fuel filter or elsewhere, try picking up a fuel system cleaner and see if that improves the situation. Lot of people here seem to like Techron.

Here's the thread I posted documenting my issue, just in case it might help:
http://www.e90post.com/forums/showthread.php?t=1057804

Good luck! Keep us posted!

02-07-2015, 06:43 AM	#1
WULFFZA Lieutenant 42 Rep 448 Posts Drives: 2011 335i MSport / 2012 X5 35d Join Date: Apr 2010 Location: SoCal iTrader: (0)	2011 N55 335 stutter and stall Apologize for not searching, didn't see the function on the app. My E90 with 40,000 miles began a new trick over the last month. When idling at a traffic light and when warm the revs will dip to 500rpm or so, idle rough and return to normal. It'll only happen once during a trip. A couple of days ago it stalled completely. It have experienced occasional long cranks for the past couple of years and mentioned it at services but they haven't proposed a fuel pump replacement. Is this likely the fuel pump or gunk in fuel filter? __________________ 2011 E90 335i M-Sport 6MT Alpine white - saddle brown 2012 E70 X5 35d Sport Activity - Alpine white - black 2005 Toyota 4Runner 4WD Sport Edition Silver
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02-07-2015, 11:02 AM	#2
norsairius Foodie and Gearhead 102 Rep 733 Posts Drives: 2011 335i xDrive Sedan Join Date: Mar 2013 Location: MN iTrader: (0) Garage List 2011 BMW 335i xDriv ... [9.50]	I've read of a number of different things that could cause this around these forums. They include: -HPFP / LPFP -Fuel injectors -Coil packs -Spark Plugs I had an issue with long cranks as well and it turned out to be the HPFP. I didn't have any of the other symptoms you mentioned though. I've had no issues since the HPFP got replaced in my car. I've started it in negative temps outside after the car's sat out all day with no problems aside from the slightly longer crank due to the cold, but nothing near as bad as it was before the pump got replaced. If you think it could be gunk in the fuel filter or elsewhere, try picking up a fuel system cleaner and see if that improves the situation. Lot of people here seem to like Techron. Here's the thread I posted documenting my issue, just in case it might help: http://www.e90post.com/forums/showthread.php?t=1057804 Good luck! Keep us posted! __________________ 2011 335i xDrive Sedan, Deep Sea Blue w/Oyster Interior
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