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BMW / e87 / n43b16 - Starts hard, does not burn all cylinders.

Łysoldrift 12537 12
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Treść została przetłumaczona polish » english Zobacz oryginalną wersję tematu
  • #1 16962426
    Łysoldrift
    Level 15  
    Hello.
    N43 engine with direct injection.
    The car had spark plugs, lambda probe coils, timing in another workshop.
    The car fires hard - catches errors of the 4th cylinder - misfiring.
    More than once it catches the errors of all cylinders.
    Injections swapping places - no change.
    Check the fuel pressure - initial, the pump in the tank is 5 bar, i.e. correct.
    High pressure at free 150 bar - isn't it too high?
    Noisy engine operation - injection system.
    When driving, it drops to 25 bar as the engine speed increases.
    Is the fuel pressure ok?
    When firing a difficult start, it goes out a few times, when it starts, the work is very uneven.
    Any hints?
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  • #2 16962961
    ozon79
    Level 13  
    And did you check the timing? Was it the same before the exchange?
  • #3 16963339
    Łysoldrift
    Level 15  
    The timing is perfectly positioned.
  • #4 16966200
    Łysoldrift
    Level 15  
    Do you know if this fuel pressure is normal?
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  • #6 16966803
    Łysoldrift
    Level 15  
    I already looked, did not find.
    They only give the forepump pressure - 5bar.
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  • #7 16966838
    ozon79
    Level 13  
    Maybe it is the pressure sensor's fault?
    Was it the same before replacing the timing?
  • #8 16966886
    Łysoldrift
    Level 15  
    The car had spark plugs, 2 coils and the timing - it ran for 3 weeks.
    Substituted with the same symptoms.
    At the moment, a very hard start, the work after firing on 3 cylinders - very uneven.
    The error of the 4th cylinder catches the fastest, when it arrived, it had errors in all 4 cylinders.
    I think it's a matter of time and it will catch bugs on 4 cylinders.
    High pressure sensor replaced with a new original BMW - it shows the same.
    When warm, the car ignites almost well, but the slow work is still noticeable.
    After disconnecting either the high pressure sensor or the regulator on the high pressure pump (the only plug of the high pressure pump) - then the pressure in the system drops from 150 bar to 5 bar and the engine works perfectly.
    That is why I am asking if the pressure of 150 bar is appropriate.
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  • #10 17668712
    radek2266
    Level 2  
    Buddy Łysoldrift, you have solved the problem with this high pressure drop, I have the same problem
  • #11 17669527
    Łysoldrift
    Level 15  
    All injectors to be replaced.
    Only new!
  • #12 17670008
    radek2266
    Level 2  
    I've already put new ones on and it doesn't help unless they're damaged
    this only happens when I drive calmly
    if I am spinning high at revolutions there is no problem
  • #13 18702089
    sparko86
    Level 8  
    Hello and how did I solve the problem. I have the same new candles, new coils. Before replacing the candles, I had a misfire on the 2nd cylinder. After the replacement it was ok, there was no falling out, but there was a problem with starting the cold one. The timing change is the same, then the loss on the 1 cylinder, I changed the 1z2 injectors and it started to fall out on 2 then I replaced the injection. The improvement was noticeable because it was better not to stop while accelerating and starting in cold improved a bit. After 2 weeks of cold night and at idle, an error appeared, but the worst thing is that again on the 2nd cylinder where the new injection was inserted.

Topic summary

The discussion revolves around a BMW E87 with an N43B16 engine experiencing hard starts and misfiring issues, particularly in the 4th cylinder. The owner has replaced spark plugs, lambda probes, and ignition coils, and checked the timing, which is confirmed to be correct. Despite these efforts, the car continues to misfire and shows high fuel pressure readings of 150 bar, which raises concerns. The owner notes that disconnecting the high-pressure sensor or regulator drops the pressure to 5 bar, resulting in smoother engine operation. Other participants suggest checking the pressure sensor and replacing all injectors, as previous replacements did not resolve the issue. The owner also shares experiences of similar problems with cold starts and misfires on different cylinders after injector replacements.
Summary generated by the language model.
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