R5 Misfire help needed

Discussion in 'Ross Tech VCDS forum' started by 4ePikanini, Nov 5, 2012.

  1. 4ePikanini

    4ePikanini Member

    Joined:
    Sep 16, 2012
    Messages:
    53
    Car:
    2005 Touareg R5
    Driving a long journey yesterday and halfway to home the car started vibrating.

    It vibrates a lot when idling and under load below 3000rpm.

    I nursed the car home with very light throttle. (A bottle of injector cleaner went in before the journey - when empty I refilled the tank with diesel without any additives and the problem persists)

    I scanned it and VCDS returned a misfire on cylinder 5. It comes back after a few seconds if I clear it.

    I tried disconnecting the ecu for a few minutes but that made no difference.
    I tried disconnecting the egr, throttle butterfly and MAF. That made no difference
    I changed the fuel filter. That made no difference.
    I pulled the tappet cover and the lobes aren't worn at all. I also disconnected the injector connectors, cleaned the contacts and reinserted. That made no difference.

    I then thought it may be an electrical issue.

    I ran some measuring blocks and this is the result.

    NB: The injector mg/str is multiplied by 10 on the chart to exagerate. The attached log file is as it was logged via VCDS.

    1638rpm in "Park".
    [​IMG]


    Idle measurements
    [​IMG]

    Chart of measurements -> Start -> revving in "Park"

    NB: The injector mg/str is multiplied by 10 on the chart to exagerate. The attached log file is as it was logged via VCDS.
    [​IMG]


    Log file

    [​IMG]
     
  2. 4ePikanini

    4ePikanini Member

    Joined:
    Sep 16, 2012
    Messages:
    53
    Car:
    2005 Touareg R5
    I have also disconnected and cleaned the injector harnass connection at the back of the head. It didn't help.
     
  3. majeka

    majeka New Member

    Joined:
    Jan 23, 2012
    Messages:
    2
    Car:
    a4 tdi 2006
    I have similar problem with R5 how did you get on with the misfire
     

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