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refusing kickdown

Discussion in 'Electrics, Vacuum, Ignition and ECU' started by range rover, Sep 15, 2018.

  1. range rover

    range rover Senior Member

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    Joined:
    Mar 26, 2008
    Location:
    Northern Ireland
    Your Mercedes:
    S class 320L CDI 4DR Auto CHALCEDONY BLUE 2005/straight 6
    Out for a drive yesterday, went to accelerate, there was no change down, I flicked the shift lever to the side and 4 popped up indicating a change down, by this time I didn't need to speed as I was coming to a shop. After I had stopped and then started about 10 minutes later, I started off like an old boy racer! The changes were perfect and have been since, what the heck was going on ?
     
  2. brianbrian

    brianbrian Senior Member

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    Location:
    cockney in the West Country
    Your Mercedes:
    w124 250D, SL129-deisel
    Have you checked A.T.F. Level?
     
  3. OP
    range rover

    range rover Senior Member

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    Joined:
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    Location:
    Northern Ireland
    Your Mercedes:
    S class 320L CDI 4DR Auto CHALCEDONY BLUE 2005/straight 6
    Yes it's OK.
     
  4. brianbrian

    brianbrian Senior Member

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    Your Mercedes:
    w124 250D, SL129-deisel
    Have you tried another kick down relay?
     
  5. OP
    range rover

    range rover Senior Member

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    Location:
    Northern Ireland
    Your Mercedes:
    S class 320L CDI 4DR Auto CHALCEDONY BLUE 2005/straight 6
    No I haven't, I think it must be electrical as it cleared after I stopped at a shop, it hasn't done it since. I think I will just play it by ear, if it does it again I will look into it much more, and I will keep you all informed.
     
  6. bembo449

    bembo449 Senior Member

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    Joined:
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    Location:
    lincolnshire
    Your Mercedes:
    216 5.5 v8 , range rover vogue , 221 320cdi , alfa romeo brera
    I think the general advice for box issues is start with a fresh filter and oil if you don't know when it was / ever been changed , unless you get a permanent problem where it can be plugged into and the codes can be read
     
  7. OP
    range rover

    range rover Senior Member

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    Your Mercedes:
    S class 320L CDI 4DR Auto CHALCEDONY BLUE 2005/straight 6
    I change the transmission oil every 40k, at the moment it is near the change time again.
     
  8. OP
    range rover

    range rover Senior Member

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    Your Mercedes:
    S class 320L CDI 4DR Auto CHALCEDONY BLUE 2005/straight 6
    Well, the problem seems to have been the EGR, apparently the computer said something along the lines of too much air, seems like there was a seal that needed renewed, there is another which the garage did not have a replacement for so it was a case of try it and see if that is any better. It was intermittent anyway, but so far no problem, happy days!
     
  9. OP
    range rover

    range rover Senior Member

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    Your Mercedes:
    S class 320L CDI 4DR Auto CHALCEDONY BLUE 2005/straight 6
    Spoke too soon, it has come back to haunt me, fault codes point to the EGR valve. Just noticed I should have this in 'Engine Drivetrain Fuel and Exhausts, in my case I have fault codes.
     
  10. Chrishazle

    Chrishazle Senior Member

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    Location:
    Nr Ashford, Kent
    Your Mercedes:
    S204 2008 C220CDI Elegance Estate Auto, 1993 Porsche 968 Tiptronic cabriolet
    When I had no kickdown with my S203 C270Cdi, along with not being able to rev above 3k, it was the MAF. Thankfully car was under warranty so changing the MAF cost me nothing, but it cured the problem!
     

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