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Z3M S50 issue

Discussion in 'Z3 M Roadster & Coupé' started by Z3Mroadster, Jun 21, 2020.

  1. Z3Mroadster

    Z3Mroadster Zorg Addict

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    Hello!


    Idle ok,power ok,

    but after driving and turning off the hot engine and driving again after 5-10 minutes, the car jerks up to 2500 rpm. After a few minutes of driving everything is ok. This has been going on for several years. There are no codes.

    Thanks!
     
  2. Mark Gutteridge

    Mark Gutteridge Zorg Addict

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    Spark plug breaking down?
     
  3. Z3Mroadster

    Z3Mroadster Zorg Addict

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    Sparks don't have any issue...
     
  4. Ianmc

    Ianmc Zorg Guru (III)
    British Zeds The M44 Massive

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    Sticking throttle cable?
     
  5. Nodzed

    Nodzed Zorg Expert (I)
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    Sounds like fuel evaporation/pressure? But what could cause it???? Could it be a fuel pressure issue? Have you ever changed the fuel filter?
     
  6. Z3Mroadster

    Z3Mroadster Zorg Addict

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    Throttle cable new and fuel filter new!
     
  7. Althulas

    Althulas Zorg Guru (IV)
    British Zeds

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    Soldering to the solenoids sound? Reason I ask as I was messing around that area and caught my cable and the revs fluctuated raising and dropping as I caught it. Something I’m adding to my list to investigate.
     
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  8. Mark Gutteridge

    Mark Gutteridge Zorg Addict

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    Could also be a vanos issue, common on the s50.
     
  9. Z3Mroadster

    Z3Mroadster Zorg Addict

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    But then he wouldn't have the power, would he?
     
  10. Z3Mroadster

    Z3Mroadster Zorg Addict

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    Vanos have 100 bar pressure!
     
  11. Nodzed

    Nodzed Zorg Expert (I)
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    Thought it should be 250?
     
  12. Mark Gutteridge

    Mark Gutteridge Zorg Addict

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    120psi Steve (mr vanos) told me
     
  13. Z3Mroadster

    Z3Mroadster Zorg Addict

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    M

    No!

    Correct is 100 bar !!!
     
  14. Mark Gutteridge

    Mark Gutteridge Zorg Addict

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    ok, 100 bar, all I know is having my vanos replaced and setup correctly was the best money I've ever spent. Different car entirely.
    I wish id had it sorted years ago.
     
  15. Althulas

    Althulas Zorg Guru (IV)
    British Zeds

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    can still have the power but an intermittent fault. I’m most likely wrong but Just an item to check and rule out.
     
  16. Nodzed

    Nodzed Zorg Expert (I)
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    OK calm down :rolleyes:
     
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  17. 137699

    137699 Regular Member

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    Could be something like a camshaft rotation sensor / TDC etc?
     
  18. Z3Mroadster

    Z3Mroadster Zorg Addict

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    How check?
     
  19. Pingu

    Pingu Zorg Guru (I)
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    Download Testo, record the data until you get the problem, then check the data.