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    S54 Engine Suddenly Dies

    Hello!
    I am trying to solve a mystery here, and I thought I could get a bit of help from you guys.


    We race a E30 M3 with a S54 engine, last weekend, we raced a enduro 6 Hours race, hopefully we won the class, but we where second place on the whole event and the car suddenly died with 8 minutes for the race to end. yes... very bad luck!!


    https://www.youtube.com/watch?v=_KbzZnSzZvk

    the car was turning off many times before, and this video is the last one before been pulled out of the track, we still managed to cross the finish line somehow..


    well, with the car at the shop, I still had the fault (this is good in some way) scanned the sucker, and this errors appeared:


    76 Electric Throttle Signal Potentiometer , Throttle
    77 Electric Throttle Signal Potentiometer, Servomotor
    78 DME Electric Throttle Potentiometer Signal Comparisson
    3C Signal Pedal - Travel Sensor 1
    3D Signal Pedal Travel Sensor 2
    4E Signal Coolant Temperature Sensor
    3A Dme Voltage Supply Sensors 1
    3B DME Voltage Supply Sensors 2
    6B Electric Throttle Self Test
    79 Electric Throttle Both Potentiometers Faulty


    Erased codes, and they still showed up, so, I changed:


    Throttle Pedal
    Throttle Servomotor
    TPS top and bottom


    still nothing...


    I then changed the entire DME with another MSS54 from another s54 engine, car runs smooth, no error code, nothing...


    I believe its DME fault, but can it be the wiring harness somehow? how can I be 100% sure this fault is DME and it won't happen again..


    thanks for your support!!

    #2
    But why problem and codes dissapear when i change the entire dme?)

    Comment


      #3
      That might not be your problem.

      Have you tried clearing adaptations before swapping ECU's?
      IG: deniso_nsi Leave me feedback here

      Comment


        #4
        Originally posted by dude8383 View Post
        That might not be your problem.

        Have you tried clearing adaptations before swapping ECU's?


        Yes, cleared, engine shuts down every time i clear it...

        Comment


          #5
          No, what you said above is you cleared the codes. You make no mention of clearing adaptations.

          I'm just saying you may have another problem instead of focusing on the ECU as the culprit. You also haven't given us any sort of inclination as to what kind of diagnosis you performed. All I see if you changing parts based on the fault codes the car produced.

          With the new ECU has the car had any more of the same issues?
          IG: deniso_nsi Leave me feedback here

          Comment


            #6
            nope, with the other ecu, car runs perfect... this is why I suspect of the ecu...

            Comment


              #7
              The problem is that it's a S54
              My Feedback

              Comment

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