2.5 low fuel pressure

[besembo]

Hi everyone
plz try to give me some advice if know something about this.
I bought this car 2 weeks ago. 325 automatic 2003 model. first the engine cut off when turned it in the morning and stopped on crossroad. it happened 3 times. there i thought something was wrong. also my 0-100 kmph timne was 11.2 seconds - terrioble isnot it ?
1) Tested fuel pressure witch was 3.3 bar on idling engine there wasnot eny change in pressure when pushing accelerator
2) I changed fuel filter with fuel regulator Bosh brand. after first start the pressure on the rail was 3.6 bar and i was verry heppy, but after 5 minutes of idling pressure vent back to 3.3 bar.
3) I bought a new fuel pump (not original) . first i tested fuel pressure on sealed old fuel pump buy turning on the key. 2 time it gave me 3.3 bar again. Then i installed a new fuel pump witch gave me 4.8 bar in equal conditions.
4) Fuel pressure check on changed pump and filter + regulator gave me 3.6 bar on idling engine and after 5-8 minutes pressure vent back to 3.3 bar.
5) There is no difference when i push aceelerator or dissconect the hose witch is going to pressure regulator.
The engine had a small vacuum leak witch i already repaired. I also repaired disa valve. added some wurth injector cleaner in fuel tank. Now car runs mutch better. 0-100 under 10 seconds, once it gave me even 9.2 seconds.
There is no burning oil, no missfire, no faulty codes, fuel trims are both 0 long term and -1.5 short term. i cannot get reading from bank one short term at all i even replaced o2 sensor before catalyst. maf reading is 3.3 - 5.0 when idling.
engine already had new spark plugs witch where 5 black and one white - the white one had bent one of the connectors closer the others. maby they dropped it inside bye accident. this is what i cannot understand
I i'm very tyred and going go sell thing car BUT what if someone knows something and can give me a good advice ?
Thank you.

[MIKYZZ4]

First step should be a diagnostic scan,
ideally with a BMW scan tool/software.
Then you would post back with codes displayed,
after which we can give an informed diagnosis,
based on what the vehicles computers are revealing.

Btw,your fuel pressure is at spec, so disregard pump issues.

Since you sense a loss of power, perform a compression test, then reveal your #'s.
Has a recent oil/filter change been performed? Remove,clean + reinstall Vanos solenoids.
After all your tune-up attempts, I would reset adaptations.

[besembo]

Thank you for your answer
First what i can do is check compresson and reset throttle + gearbox adaptations. is there something more to reset ?
I doubght about compression coz there is ano any smoke srom exaust even at full rpms. smoke came out as soon as i repaired disa but in 5 minutes it was ok again. Think there was some kind of oil or water as condensation...

and how do you think did i change fuel pump for nothing ? old 3.3 bar vs new 4.8 bar messured at pump ...

[MIKYZZ4]

and how do you think did i change fuel pump for nothing ? old 3.3 bar vs new 4.8 bar messured at pump ...

Specs for an e46 are 3.5bar +/- 0.2

[besembo]

i already know that , i have red everything existing in internet
i'm tanking about pressure without pressure regulator, at reat seat was 3.3 bars and new gives 4.7.

[MIKYZZ4]

As you said in your post-it's a new pump(not original), so I suspect it has different specs,
but why, all that's needed to run is 3.3 bar? Maybe I'm just misunderstanding.

[besembo]

Man thanks for your help
I already sold that car. maby i can find a better one later. Deal is in my country thay just eat e46 models and there arenot left good ones. Also from past year Customs clearance payment for old cars has rised a LOT.