Crank no start, after Engine head cover change N47 engie

[TarekAnwar]

I did engine head cover change and when i try cranking i get crank with no start
checked bimmerlink got the following parameters
injection status 24
crank speed 214
injection flow 38 mg/hub
Desired injection 33mg/hub
status rail pressure 2
absolute throttle position 89%
Offset cam angle -0.61°

[E-bmw]

The simple answer is, if it worked before you did stuff, and doesn't work now, then you have removed/unplugged/incorrectly fitted something in the process of doing the job.

[TarekAnwar]

Thanks for your reply, yes it was working fine but i double checked every clip again and every thing is correct- what might be an unforseen issue that the computer cant identify

[E-bmw]

TarekAnwar said:

Thanks for your reply, yes it was working fine but i double checked every clip again and every thing is correct- what might be an unforseen issue that the computer cant identify

Seriously, it could be virtually anything in there, you need to go over it again & look closer.

[TarekAnwar]

E-bmw said:

TarekAnwar said:

Thanks for your reply, yes it was working fine but i double checked every clip again and every thing is correct- what might be an unforseen issue that the computer cant identify

Seriously, it could be virtually anything in there, you need to go over it again & look closer.

I did DDE diagnosis and i got error 25D100 which return and doesnt get reset

Error description
Boost pressure sensor, signal: interruption or short circuit to ground

This is the description as in bimmer link

[Elliot2000]

So if you have had the cam cover off, then the injectors and fuels lines will have been off too- there is a bleed routine for the fuel system, even with this it can take a while to fire up.
I’d suggest some easy start spray first as that would help rule out a few things and it will get the engine turning over quicker than just on the starter motor, if it fires up on it, which will help the fuel pressure too.

[TarekAnwar]

So the last updates is that i removed the injectors and the fuel rail again and cranked the engine to remove any excess fuel in the cylinders, there was little in cylinder 4 then i reassembled all the system then i tried cranking with releasing the air from the fuel system by slightly unscrewing the fuel line at the injector until it spill little fuel, one by one for the 4 injectors, cranked the engine and the OBD ERRORS are all reset and no faults appear anymore, and fuel rail pressue reached 400 bar during cranking now.

I am stuck i dont know what should be done more ?!
I think the DDE is blocking injection. But i dont know why..

[E-bmw]

TarekAnwar said:

I am stuck i dont know what should be done more ?!
I think the DDE is blocking injection. But i dont know why..

So, why are you assuming the injectors aren't injecting?

You say you have fuel pressure but don't mention checking if the injectors are actually injecting fuel.

[TarekAnwar]

You are right, there is injection quantity read during cranking, 56mg/hub
While required is 48mg/hub so its more for starting.. looks normal… what dod you suggest?

[TarekAnwar]

E-bmw said:

TarekAnwar said:

I am stuck i dont know what should be done more ?!
I think the DDE is blocking injection. But i dont know why..

So, why are you assuming the injectors aren't injecting?

You say you have fuel pressure but don't mention checking if the injectors are actually injecting fuel.

[Jakg]

Elliot2000 said:

So if you have had the cam cover off, then the injectors and fuels lines will have been off too- there is a bleed routine for the fuel system, even with this it can take a while to fire up.
I d suggest some easy start spray first as that would help rule out a few things and it will get the engine turning over quicker than just on the starter motor, if it fires up on it, which will help the fuel pressure too.

I know you've said you've bled it already, but they (at least the N57) can be a pain to start after having the fuel system apart.

The diagnostic screenshots you've shared are a bit confusing - the values look a bit strange but then there are no units.

The other thing that I'd be checking is that you have valid cam/crank sensor readings as it's cranking - if they are out-of-sync, the ECU won't let the engine start.

[TarekAnwar]

Jakg said:

Elliot2000 said:

So if you have had the cam cover off, then the injectors and fuels lines will have been off too- there is a bleed routine for the fuel system, even with this it can take a while to fire up.
I d suggest some easy start spray first as that would help rule out a few things and it will get the engine turning over quicker than just on the starter motor, if it fires up on it, which will help the fuel pressure too.

I know you've said you've bled it already, but they (at least the N57) can be a pain to start after having the fuel system apart.

The diagnostic screenshots you've shared are a bit confusing - the values look a bit strange but then there are no units.

The other thing that I'd be checking is that you have valid cam/crank sensor readings as it's cranking - if they are out-of-sync, the ECU won't let the engine start.

The units of the readings are under each one and parameters without are just status parameters, I will system bleed then..

These are other live data i recorded during cranking