BMW E90 320d crank no start low rail pressure

[Muzzammil57]

Hello everyone

At the moment i have e90 320d 2007 M47 with non start problem and really determined to get it back on road

So what is known so far.

Been checked on diagnostics - rail pressure too low, it was reading live data while cranking and pressure in rail was between 8-20 bar when cranking, no other faults.

Whats been done so far :

Removed fuel line to see if in tank pump is pumping - Yes its working.

Checked fuses and relays, swapped most relays - no difference

Tried easy start - still wont start

Removed back flow from injectors to check for bad back leak,but to my surprise when cranking,there was no fuel at all coming from injectors.

Tried swaping fuel pressure sensor that is at front of the rail (second hand) no change

Tried getting a fuel rail regulator, still no change

I have also sourced a 2nd hand high pressure fuel pump however it made no difference.

Crank and cam sensor was tested and both working perfectly fine

Also, when i removed fuel pressure sensor from from of the rail, i was expecting diesel to leak out badly, as i guess it would still be under some sort of pressure? But there was hardly few drops that came out.

 

[Randy ///M]

Hello everyone

At the moment i have e90 320d 2007 M47 with non start problem and really determined to get it back on road

So what is known so far.

Been checked on diagnostics - rail pressure too low, it was reading live data while cranking and pressure in rail was between 8-20 bar when cranking, no other faults.

Whats been done so far :

Removed fuel line to see if in tank pump is pumping - Yes its working.

Checked fuses and relays, swapped most relays - no difference

Tried easy start - still wont start

Removed back flow from injectors to check for bad back leak,but to my surprise when cranking,there was no fuel at all coming from injectors.

Tried swaping fuel pressure sensor that is at front of the rail (second hand) no change

Tried getting a fuel rail regulator, still no change

I have also sourced a 2nd hand high pressure fuel pump however it made no difference.

Crank and cam sensor was tested and both working perfectly fine

Also, when i removed fuel pressure sensor from from of the rail, i was expecting diesel to leak out badly, as i guess it would still be under some sort of pressure? But there was hardly few drops that came out.

What was the problem buddy did you manage to get it shorted out ?
Best to have any Issue properly Diagnose first .

i had a similar situation were my car just didnt wanted to start the next morning end up to be my Fuel Pump that give inn luckerly it happened at home .

 

[Muzzammil57]

What was the problem buddy did you manage to get it shorted out ?
Best to have any Issue properly Diagnose first .

i had a similar situation were my car just didnt wanted to start the next morning end up to be my Fuel Pump that give inn luckerly it happened at home .

Unfortunately I still haven’t found the issue.

 

[Randy ///M]

Sorry to hear that its not Shorted out yet ....hope you get it shorted out eventually.

 

[halhorn]

Have you solved the issue? Has exavtly the same issue on mine.

 

[Rami_]

well happend to me once in e46 320d m47n after i remove the intake manifold the wires were cracked and the connection was very bad i only weld new wire and its good to go..
can you explain more what happend before the problem, have you done anything lately?

 

[halhorn]

well happend to me once in e46 320d m47n after i remove the intake manifold the wires were cracked and the connection was very bad i only weld new wire and its good to go..
can you explain more what happend before the problem, have you done anything lately?

Hi, I changed the engine and the manifold also (had swirl flap delete on the broken engine). I also had to move the wiring harness from the old engine to the new one.

 

[Muzzammil57]

well happend to me once in e46 320d m47n after i remove the intake manifold the wires were cracked and the connection was very bad i only weld new wire and its good to go..
can you explain more what happend before the problem, have you done anything lately?

I never got a chance to look at the wiring, I still never got the car sorted. At this point I’m willing to try anything😅

 

[Rami_]

I never got a chance to look at the wiring, I still never got the car sorted. At this point I’m willing to try anything😅

well just check out the connection see if there is anything you could do

 

[Mytfine]

Are the injectors pulsing ? If not could be either the loom or ecu.

 

[Muzzammil57]

Are the injectors pulsing ? If not could be either the loom or ecu.

I check the injector plug with a test light while swinging and I saw the pulse was very low, the light went on but barely

 

[Mytfine]

I check the injector plug with a test light while swinging and I saw the pulse was very low, the light went on but barely

Have you tried the spare key ?

 

[Muzzammil57]

Have you tried the spare key ?

Yes I have tried both keys.