Hi hope you don't mind me asking for help on my first post. I have a non starting 118D. 2010 N47 engine. Engine tries to start after much cranking, then seems to lock up and stop, but wont start. Originally thought the timing chain snapped as this drives the high pressure pump, but cams are turning and sounds like it has compression, so do not think it is that. Getting low fuel pressure code 4b90. Tried a new rail pressure sensor today and still the same, never that easy is it. Definitely seems like a fuel pressure problem, only about 12bar on cranking gradually rising to about 60bar then starts to fire then stops, target pressure is about 400bar. Connected air line to the disconnected fuel pressure sensor and pressure went up, so that seems to be working, but no pressure in the rail. Disconnected fuel filter and fuel flows out, but only while cranking, not just with the ignition on, not sure if this is normal as cannot hear the fuel tank pump prime when ignition switched on. About 7bar pressure out of the filter. Looking like high pressure fuel pump to me, although did not see any metal particles in the filter. Anyone any ideas before i condemn the fuel pump and injectors. Please help. Thank you
ADE H
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1,712 Posts
It could be to start with hpfp 1 or more injectors leaking or DDE may have a problem if it been remapped wrong
If it's the dde we can test it to make sure it's working
BW chiptune
Tuning BMWs since 1991
Dyno Dynamics rolling road
BW autorepairs
Over 30 year repairing BMWs
New and fully refurbished BMW,Alpina Ecus and Cas units
BMW Keys made and cut same day
Correction of Engine ECUs Cas and key fitted to your car (when a key set from a different car has been used)
Digital Service Records rest and corrections in idrive screen on 2013 onwards cars
DPF repairs fixed without the need of removal of its guts or replacement
40% of my work is repairing the problems that are caused by other tuners Remaps
0208 561 1818
07831 103030
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Sent from my iPhone using Tapatalk Pro
If it's the dde we can test it to make sure it's working
BW chiptune
Tuning BMWs since 1991
Dyno Dynamics rolling road
BW autorepairs
Over 30 year repairing BMWs
New and fully refurbished BMW,Alpina Ecus and Cas units
BMW Keys made and cut same day
Correction of Engine ECUs Cas and key fitted to your car (when a key set from a different car has been used)
Digital Service Records rest and corrections in idrive screen on 2013 onwards cars
DPF repairs fixed without the need of removal of its guts or replacement
40% of my work is repairing the problems that are caused by other tuners Remaps
0208 561 1818
07831 103030
Hayes
UB3 1BB
Sent from my iPhone using Tapatalk Pro
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