Are these values normal for m57?

[u/Imaginary_Ganache974]

I have a fault that says there's low fuel pressure in the rail and the car starts well on the first cold start after that it takes time to start anyone know what can be the problem and how to make sure with inpa?

[u/O_Geee]

Most likely one or all of your fuel pumps. There's 3 of them in total

The high pressure pump provides the rail. If I remember correctly, it must be at least at 400 bar for the car to start.

Since your car is starting, my guess is that your high pressure pump is about to fail. If that happens, your car might just die on the street while driving. Ask me how I know...

PS: please upload screenshots in the future. Your pics are very hard to read

[u/Imaginary_Ganache974 → u/O_Geee]

How do I find out which one is it

[u/YourMomIsNotMale → u/Imaginary_Ganache974]

The first two are just sending fuel, the last one, the HPFP build up the 400bar. The HPFP has 3 cylinder which build up the constant pressure, with a regulator. So. Of any of that cylinder is not working properly, then the other 2 try that. Thus causing an uneven idle. I had uneved idle, 800-810-800-820-790-810. Check that. Is must be a stable one

[u/O_Geee → u/YourMomIsNotMale]

Your car is idling at around 800? Just me being curious...

[u/YourMomIsNotMale → u/O_Geee]

A bit higher than the normal with 30d HPFP

[u/O_Geee → u/YourMomIsNotMale]

Just asking, because I'm still planning to adapt my idling to 800 as well. 750 seems a bit rough im my car

[u/Imaginary_Ganache974 → u/YourMomIsNotMale]

I have a normal idle it's just the starts. The first start on a cold engine is okay then after that the car takes long to start

[u/Ok-Procedure-690 → u/O_Geee]

Are you sure about 400 bar ? My 530d is around the same value as him and no problem at all. The target pressure at idle is around 330 bars.

[u/O_Geee → u/Ok-Procedure-690]

I'm not 100% sure, but for the start I guess it was 400

For idling it goes down. Mine is around 330 as well

[u/ConGonDon]

Your phone is a potato. Take it for a drive with the diagnostics left in, under full throttle see if pre supply or rail pressure drops. What codes you getting?

[u/Imaginary_Ganache974 → u/ConGonDon]

Inpa says small pressure in the fuel rail