Super Knock code (No Cel or Pxxxx codes)

Discussion in '2nd Generation: 2007+ R55 through R61' started by cristo, Dec 10, 2018.

  1. cristo

    cristo Well-Known Member

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    #1 cristo, Dec 10, 2018
    Last edited: Dec 10, 2018
    Since taking ownership of my 2009 JCW Clubman R55 last May, I've had several occurrences of
    about a half second of lost power while accelerating followed by the appearance of two codes on
    full scans of the whole system with my Schwaben (Foxwell NT510) scanner.
    These are the alphanumeric codes in the DME engine management section of a full auto-scan
    (not an OBDII Pxxxx code) and are for superknock on cylinder 4 (or 1 or 3, etc. different cylinders each time)
    and a fuel cutoffcode for the same cylinder.
    No CEL and no stored or pending codes on an OBDII scan. I take note of the DME code and erase it, and it
    happens again only once every month or so. I scan it about once a week and the code doesn't recur
    until the same brief hesitation on acceleration occurs again.
    I've read that many if not most N14 R56 models tend to have these particular codes stored on them, so
    I'm not too freaked out, but wondering if there is a real problem that needs to be addressed (intake
    valve crud, Vanos issues, timing chain guide issues, etc.).
    I have less than 33,000 miles on the car (about 4,000 by me), and don't hear any suspicious noises on startup
    to suggest chain tensioner problems (just the sewing machine tap of the DFI), have new OEM plugs, and
    no other associated codes or issues.
     
  2. MCS02

    MCS02 Moderator
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    Posable carbon build up. You getting close to the time to have it blasted.
     
  3. Dave.0

    Dave.0 Helix & RMW Powered
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    You are in Southeast PA right? Give the guys at Helix a call. They can carbon blast the car and review all your issues for you. Ask for Tim or Eric.

    4648 Umbria Street
    Philadelphia, PA 19127
    267 335 4337


    http://store.helix13.com/headquarters/
     
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  4. cristo

    cristo Well-Known Member

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    Helix is just a little far to go since Swedish
    Motors is just across the Susquehanna
    from me in Marietta and they have
    extensive MINI experience and training.
    If I were closer I’d go to Helix.
     
  5. Crashton

    Crashton Club Coordinator

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    Not to disparage Swedish Motors, but IMO Helix is worth the drive.

    I hope you can find out the cause & cure it.
     
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  6. MCS02

    MCS02 Moderator
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    And Helix supports MA and the Dragon
     
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  7. Dave.0

    Dave.0 Helix & RMW Powered
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    Helix will be cheaper.
     
  8. cristo

    cristo Well-Known Member

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    Thanks all.
    I will think hard about this between now
    and the next time it occurs.
     
  9. MCS02

    MCS02 Moderator
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    Good luck, let us know what you find.
     

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