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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Low Fuel Pressure jumps



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      12-16-2013, 01:59 PM   #1
RomanK
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Low Fuel Pressure jumps

Hello guys.

Sorry for my English...

I have the BMW 335i 2007. N54 engine.

I have the problem with acceleration. When I try to accelerate I get "Engine Fault, reduced power" message.

I will not describe all my feels, I will ask only concretely question.

I have the error messages: 2AAF, 29DC, 29F2 and sometimes ago I had the 2FBF... but now it doesn't appear...

I take a logs of my fuel pressures.

This is the first:

At the beginning of the graph is the acceleration.

Red line - low pressure
Blue line - high pressure
Green line - RPM.

It is obvious, that when I tried to accelerate, my high pressure is going down! So, I suppose that my HPFP died.

But my question is: is it correct that low pressure can has such noise under acceleration??? Why the pressure has such jumps?

One more log for more understanding:



I already ordered the HFPF but I think that my fuel regulator at the fuel tank also died.

What do you think?

Thanks!

Best Regards, Roman
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      12-16-2013, 02:32 PM   #2
enrita
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Search for the codes for answers...
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      12-16-2013, 02:42 PM   #3
RomanK
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I know the info about these codes... I would like to know about the low pressure. Should it be so noisy under acceleration or not? Without acceleration it holds 5.7 bar without any problems.
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      12-16-2013, 03:03 PM   #4
enrita
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Than post what the codes means... Do u think people here know all codes by heart???????
At least make an effort...
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      12-16-2013, 03:21 PM   #5
RomanK
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Ok. Sorry...

2AAF - Fuel pump, plausibility
29DC - Cyl. injection switch-off
29F2 - Fuel high pressure system, fuel pressure
2FBF - Fuel pressure at injection release
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      12-16-2013, 06:19 PM   #6
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HPFP going out if you asked me, what fuel are you running on?
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      12-17-2013, 10:46 AM   #7
RomanK
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I use 98 gasoline in Russia.

Yes, I already ordered the HPFP.. but my question is: Is it correct that low pressure can has such noise under acceleration? Why the pressure has such jumps?
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      01-17-2014, 10:02 AM   #8
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Funny howi have nearly the exact same problem as yours. Before the 29DC , I kept getting 29F3, in one instance I had a 29F2 captured in series on my Cobb AP. Similarly when I try to accelerate I get half engine light and the car would go into fault saying reduced power on the IDrive.
What I did first was to address the LPFP pressure sensor right before the hpfp in the engine bay. That fixed it altogether.

But as much as those are gone I am now getting a 29DC fault with 2AAF ( this is common ) and harmless. This is the tough one. I am running E60 so they say its due to that but the puzzling problem is that I once ran pure E85 and it was fine then.

Am running a new 480 l/hr custom E85 only GM LPFP pump and my pressures stay above 70 psi constant.

Change your lpfp sensor first, next will be hpfp if you are still having issues.

Hell I am contemplating a second hpfp but then again I have no symptoms of an hpfp trouble.

Good luck.
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