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Restricted Revs

Discussion in 'Engine, Drivetrain, Fuel and Exhaust' started by John Wilcock, Nov 8, 2012.

  1. John Wilcock

    John Wilcock New Member

    Messages:
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    Joined:
    Nov 8, 2012
    Location:
    Oxford
    Your Mercedes:
    Mercedes C CLASS 220 CDI
    Hello everyone. Was wondering if anyone could help me please. I have a 2005 Mercedes C Class 220 CDI. Over the last month or so it seems to be restricting itself. when I go to accelerate away or overtake its like driving a tractor, no power, changes through the gears at about 2500 revs. Its ok when I first start but the problem happens about 15 mins into a journey, for instance, i slow down to go round a roundabout then accelerate away...... nothing, just plods along. Any help or suggestions would be greatly accepted. Thanks. John
     
    John Wilcock, Nov 8, 2012
    John Wilcock, Nov 8, 2012
    #1
  2. Mark A

    Mark A Senior Member

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    Joined:
    Aug 13, 2006
    Location:
    Aberdeen
    Your Mercedes:
    08 ML-420CDI, 58 ML-320CDI, 66 CLS-220d
    Sounds like its going into limp home mode. You need to get the codes read on STAR, it could be any number of faults unfortunately.

    Welcome to the forum !

    Mark
     
    Last edited: Nov 8, 2012
    Mark A, Nov 8, 2012
    Mark A, Nov 8, 2012
    #2
  3. OP
    John Wilcock

    John Wilcock New Member

    Messages:
    3
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    Joined:
    Nov 8, 2012
    Location:
    Oxford
    Your Mercedes:
    Mercedes C CLASS 220 CDI
    Have taken it to a local garage who puts it on diagnostic but shows no faults. speed sensor?
     
    John Wilcock, Nov 8, 2012
    John Wilcock, Nov 8, 2012
    #3
  4. OP
    John Wilcock

    John Wilcock New Member

    Messages:
    3
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    Joined:
    Nov 8, 2012
    Location:
    Oxford
    Your Mercedes:
    Mercedes C CLASS 220 CDI
    Thanks for your quick reply
     
    John Wilcock, Nov 8, 2012
    John Wilcock, Nov 8, 2012
    #4
  5. Mark A

    Mark A Senior Member

    Messages:
    1,029
    Likes Received:
    176
    Joined:
    Aug 13, 2006
    Location:
    Aberdeen
    Your Mercedes:
    08 ML-420CDI, 58 ML-320CDI, 66 CLS-220d
    You are welcome.

    If it wasn't A Mercedes diagnostic machine, then it may not pick up the codes.

    It could be anything from air flow sensor to cam sensor to gearbox trouble unfortunately.
     
    Last edited: Nov 8, 2012
    Mark A, Nov 8, 2012
    Mark A, Nov 8, 2012
    #5

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