29DC under acceleration

LangJai · 11-09-2016, 02:32 PM

Hi,

Recently the car jerks under acceleration. When it's over 50% throttle, the car shakes and the half engine light comes on. The only code is 29DC and nothing else.

Mods: JB4, BMS flash, ER CP and BOV, BMW Intake.
Fuel: NO E85. 100% 94 octane from Petro Canada.

Click here for my datalog

I did some research and I think this fellow member's situation was similar to what I have now. Could it be the HPFP? Any help is appreciated...thanks!

11-09-2016, 02:40 PM

looks like lpfp...I'm sure that google can confirm

LangJai · 11-09-2016, 02:45 PM

Quote:

Originally Posted by FCobra94

looks like lpfp...I'm sure that google can confirm

It's all over the place from lpfp/hpfp/injectors/spark plugs/coil...I wanna see if I can do more diagnosis before replacing something prematurely.

Oh and the spark plugs have less than 5,000 miles on them. Last walnut blasting was about 30,000 miles ago.

LangJai · 11-09-2016, 03:18 PM

Well, if I'm reading your logs correctly, it would appear that your LPFP values are dipping into the 30's? That would definitely point to a pretty significant problem with your LPFP.

LangJai · 11-09-2016, 04:49 PM

Quote:

Originally Posted by FCobra94

Well, if I'm reading your logs correctly, it would appear that your LPFP values are dipping into the 30's? That would definitely point to a pretty significant problem with your LPFP.

Yes indeed, it dipped into 30's right when the car shaked. However, the HPFP is completely below 10 as well which, according to what I've been told, needs to be replaced. Is there anything I can do so that I know exactly what is the culprit?

Here's another log.

Thanks!

LangJai · 11-09-2016, 04:59 PM

Sorry, not too familiar with JB4 scaled values...looking forward to hearing from some more experienced users though so that we can get your issue squared away

LangJai · 11-10-2016, 03:15 PM

So I updated my jb4 firmware as well as interface, problem persists.
New natalog

HPFP?

Thanks....

LangJai · 11-14-2016, 03:26 PM

No one?

TrAcK TRaP · 03-15-2017, 01:15 PM

Quote:

Originally Posted by LangJai

No one?

Just wondering what was your problem if you fixed that. LPFP?

11-09-2016, 02:32 PM	#1
LangJai Private First Class 26 Rep 190 Posts Drives: 335i RWD 6MT Join Date: Feb 2015 Location: GTA/KW iTrader: (0)	29DC under acceleration Hi, Recently the car jerks under acceleration. When it's over 50% throttle, the car shakes and the half engine light comes on. The only code is 29DC and nothing else. Mods: JB4, BMS flash, ER CP and BOV, BMW Intake. Fuel: NO E85. 100% 94 octane from Petro Canada. Click here for my datalog I did some research and I think this fellow member's situation was similar to what I have now. Could it be the HPFP? Any help is appreciated...thanks! __________________ 2009 BMW 335i \| RWD \| 6MT \| M Sport \| BMW PE \| BMS DCI \| Bilstein PSS9 \| ER CP+TiAL BOV Coded: Digital Speedo, Disable nav disclaimer, Auto folding mirrors when lock/unlock, Amber corner lights delete Last edited by LangJai; 11-09-2016 at 02:41 PM..
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11-09-2016, 02:40 PM	#2
FCobra94 Guest 0 Rep n/a Posts Drives:	looks like lpfp...I'm sure that google can confirm
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11-09-2016, 03:18 PM	#4
FCobra94 Guest 0 Rep n/a Posts Drives:	Well, if I'm reading your logs correctly, it would appear that your LPFP values are dipping into the 30's? That would definitely point to a pretty significant problem with your LPFP.
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11-09-2016, 04:59 PM	#6
FCobra94 Guest 0 Rep n/a Posts Drives:	Sorry, not too familiar with JB4 scaled values...looking forward to hearing from some more experienced users though so that we can get your issue squared away
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11-10-2016, 03:15 PM	#7
LangJai Private First Class 26 Rep 190 Posts Drives: 335i RWD 6MT Join Date: Feb 2015 Location: GTA/KW iTrader: (0)	So I updated my jb4 firmware as well as interface, problem persists. New natalog HPFP? Thanks.... __________________ 2009 BMW 335i \| RWD \| 6MT \| M Sport \| BMW PE \| BMS DCI \| Bilstein PSS9 \| ER CP+TiAL BOV Coded: Digital Speedo, Disable nav disclaimer, Auto folding mirrors when lock/unlock, Amber corner lights delete
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11-14-2016, 03:26 PM	#8
LangJai Private First Class 26 Rep 190 Posts Drives: 335i RWD 6MT Join Date: Feb 2015 Location: GTA/KW iTrader: (0)	No one? __________________ 2009 BMW 335i \| RWD \| 6MT \| M Sport \| BMW PE \| BMS DCI \| Bilstein PSS9 \| ER CP+TiAL BOV Coded: Digital Speedo, Disable nav disclaimer, Auto folding mirrors when lock/unlock, Amber corner lights delete
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