Jerking/bucking issue when driving

TheMidnightNarwhal · 08-27-2019, 09:05 PM

I'm doing this post for my friend. He has a 2008 335xi with 118k miles ( 190k km).

He has had this odd issue that started not as often but now it is doing it almost always. Hot, cold, WOT, normal throttle it will all happen but usually only after shifting into a gear. So like if he keeps cruising at the same speed there is no bucking or jerking. But if he goes WOT most of the time it will occur, but not always, or shifting from 1rst to 2nd then just driving normally it will until he cruises.

I have ZERO codes which is why I am making this post... I and he have no idea where to start.

Also brings me to getting actual data logs... he doesn't want to pay for MHD. I tried to use ISTA but man, unless I am not using the software right, data logging in that is terrible and you can only show values from that same section. If someone knows way to proper datalog in ISTA please advise.

Apparently he is hitting 17 PSI boost on no tune to... looking in ISTA so I'm thinking ISTA data is not really correct... . If we base of on ISTA again for rail pressure and LPFP pressure all seems good.

The main thing we may think it is the HPFP or fuel injectors. He has Index 8 so that doesn't help and no reports of HPFP being replaced by PO. PO is not original owner of the car.

I know we could change injectors and HPFP but considering he wants to sell his car he isn't looking at spending 2 grand, USD...

Any advice on confirming more on the issue?

ragingpanda · 08-27-2019, 11:42 PM

Get mhd or sell car as is.

CarAbuser · 08-28-2019, 03:38 AM

TestO is what you need for logging. Google it as most of the info is on other bimmerforums and I can't crosslink.

dpaul · 08-28-2019, 09:35 AM

http://www.bimmerforums.com/forum/sh...ime-graph-view
https://www.e90post.com/forums/showthread.php?t=1169885

HiRev335i · 08-28-2019, 07:18 PM

check the low pressure fuel sensor I would start there.....

IllSic_Design · 08-28-2019, 08:06 PM

Sounds like fuel/injector cut off but weird that there are no codes at all showing, even shadow?

MightyMouseTech · 08-28-2019, 09:09 PM

Sounds like the transfer case is toast.

TheMidnightNarwhal · 08-28-2019, 09:38 PM

Quote:

Originally Posted by IllSic_Design

Sounds like fuel/injector cut off but weird that there are no codes at all showing, even shadow?

No no shadow codes...

Quote:

Originally Posted by MightyMouseTech

Sounds like the transfer case is toast.

Ohhh interesting thought could be maybe.

I'll get the data log software that is recommended and if nothing pops up might be that.

08-27-2019, 09:05 PM	#1
TheMidnightNarwhal Major General 2814 Rep 6,384 Posts Drives: 11' 335is DCT Join Date: Jun 2015 Location: Gatineau, Quebec iTrader: (0)	Jerking/bucking issue when driving I'm doing this post for my friend. He has a 2008 335xi with 118k miles ( 190k km). He has had this odd issue that started not as often but now it is doing it almost always. Hot, cold, WOT, normal throttle it will all happen but usually only after shifting into a gear. So like if he keeps cruising at the same speed there is no bucking or jerking. But if he goes WOT most of the time it will occur, but not always, or shifting from 1rst to 2nd then just driving normally it will until he cruises. I have ZERO codes which is why I am making this post... I and he have no idea where to start. Also brings me to getting actual data logs... he doesn't want to pay for MHD. I tried to use ISTA but man, unless I am not using the software right, data logging in that is terrible and you can only show values from that same section. If someone knows way to proper datalog in ISTA please advise. Apparently he is hitting 17 PSI boost on no tune to... looking in ISTA so I'm thinking ISTA data is not really correct... . If we base of on ISTA again for rail pressure and LPFP pressure all seems good. The main thing we may think it is the HPFP or fuel injectors. He has Index 8 so that doesn't help and no reports of HPFP being replaced by PO. PO is not original owner of the car. I know we could change injectors and HPFP but considering he wants to sell his car he isn't looking at spending 2 grand, USD... Any advice on confirming more on the issue?
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08-27-2019, 11:42 PM	#2
ragingpanda Banned 323 Rep 751 Posts Drives: 135i Join Date: May 2012 Location: Florida iTrader: (0)	Get mhd or sell car as is.
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08-28-2019, 03:38 AM	#3
CarAbuser Lieutenant Colonel 486 Rep 1,550 Posts Drives: Z4 35i DCT / E92 335i DCT Join Date: Jul 2010 Location: United Kingdom iTrader: (0)	TestO is what you need for logging. Google it as most of the info is on other bimmerforums and I can't crosslink.
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08-28-2019, 09:35 AM	#4
dpaul Lieutenant Colonel 655 Rep 1,893 Posts Drives: 2009 E90 335xi, 2011 E93 M3 Join Date: Dec 2012 Location: Boston iTrader: (3)	http://www.bimmerforums.com/forum/sh...ime-graph-view https://www.e90post.com/forums/showthread.php?t=1169885
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08-28-2019, 07:18 PM	#5
HiRev335i Private First Class 46 Rep 117 Posts Drives: 09 E92 335i sport pkg Join Date: Jun 2017 Location: Canada iTrader: (0)	check the low pressure fuel sensor I would start there.....
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08-28-2019, 08:06 PM	#6
IllSic_Design Colonel 2125 Rep 2,759 Posts Drives: 12 E92 328i Join Date: Jun 2016 Location: Northern California iTrader: (1)	Sounds like fuel/injector cut off but weird that there are no codes at all showing, even shadow?
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08-28-2019, 09:09 PM	#7
MightyMouseTech Major General 4344 Rep 6,196 Posts Drives: 13 135i 6MT LeMans Blue MSport Join Date: Feb 2013 Location: Ottawa, Canada iTrader: (0)	Sounds like the transfer case is toast.
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