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E60 M5 (2006 - 2010)

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  #1  
Old 07-02-2014, 05:18 AM
staccato84 staccato84 is offline
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Location: England
 
Join Date: Jul 2014
Posts: 4
Mein Auto: BMW m5 E60
M5 E60 help needed fuel pressure mystery

Hey all.

I've got a BMW m5 E60 2005 model. At 3k rpm with sport button on or off, at high rpm the management light comes on and I get 'engine fault reduced power'.

I know what you're thinking - heard it all before - but mine is more of a mystery.

I've replaced fuel filter with brand new one - didn't solve it.

Replaced fuel pump with 2nd hand one from 2007 low mileage M5 - didn't solve it.

Reset adaptations by main dealer - didn't solve it.

I'm getting fault code 2788 by itself and I've been told that fuel pressure at idle is too high, and fuel pressure at high rpm is too low.

Next step is replacement of the fuel pump control module. I'm guessing at this because it sounds as though the pump is receiving dodgy signals.

Anyone offer any further advice?
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  #2  
Old 07-10-2014, 01:42 PM
sc426hemi sc426hemi is offline
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Location: Texas
 
Join Date: Feb 2014
Posts: 32
Mein Auto: F-350
I wish I could help but all I can do is offer my condolences. sorry to hear this.
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  #3  
Old 09-04-2014, 10:07 AM
Davidmakri Davidmakri is offline
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Location: Cyprus
 
Join Date: Sep 2014
Posts: 1
Mein Auto: Bmw e46 320 22l
Did u fixed the problem? I have a friend with the same think.

Quote:
Originally Posted by staccato84 View Post
Hey all.

I've got a BMW m5 E60 2005 model. At 3k rpm with sport button on or off, at high rpm the management light comes on and I get 'engine fault reduced power'.

I know what you're thinking - heard it all before - but mine is more of a mystery.

I've replaced fuel filter with brand new one - didn't solve it.
Replaced fuel pump with 2nd hand one from 2007 low mileage M5 - didn't solve it.

Reset adaptations by main dealer - didn't solve it.

I'm getting fault code 2788 by itself and I've been told that fuel pressure at idle is too high, and fuel pressure at high rpm is too low.

Next step is replacement of the fuel pump control module. I'm guessing at this because it sounds as though the pump is receiving dodgy signals.

Anyone offer any further advice?
Did u fixed it after all?
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  #4  
Old 09-06-2014, 09:02 PM
meangreen94z meangreen94z is offline
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Location: Houston
 
Join Date: Jun 2010
Posts: 175
Mein Auto: 2004 BMW 745i sport
They have a low pressure fuel sensor. They are hidden away under the wheel well liner(left front on left hand drive models, should be the same on RHD models.). They don't fail as often as the N54/N63 sensors, but they do go bad. Essentially the pressure reading is off.
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