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W203 loosing power

Discussion in 'Engine, Drivetrain, Fuel and Exhaust' started by kredol, Nov 22, 2012.

  1. kredol

    kredol Senior Member

    Messages:
    69
    Likes Received:
    0
    Joined:
    Mar 10, 2011
    Location:
    Brighton, UK
    Your Mercedes:
    C270 CDI & SLK230
    Hi.
    My C270 CDI behaves strange recently. When I start the engine, for few minutes everything is fine. After a while it looses power. Does not want to do kick downs when I accelerate and revs only go up to 2000.
    Does anyone know what it could be?
    Cheers
     
  2. WG M-B

    WG M-B Senior Member Authorised Forum Supporter

    Messages:
    3,105
    Likes Received:
    6
    Joined:
    Dec 5, 2010
    Location:
    North west london
    Your Mercedes:
    C63 Wagon in black
    Could be many things I'm afraid
    Blocked kat ( usually start to become apparent as engine temp goes up)
    Boost leak ( you will usually hear an air leak on acceleration)
    Air mass sensor faulty
    What year is it? If it has a vvt turbo could be this as well, although I would think not
     
  3. Sponcom

    Sponcom Senior Member

    Messages:
    82
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    Joined:
    Sep 5, 2012
    Location:
    Cirencester
    Your Mercedes:
    C class/2002/270CDI
    It sounds like its going into what's called limp mode - the turbo will not be operating and revs limited.

    Typical candidates seem to be EGR valve needs a clean or not working. MAF sensor (air flow) knackered, boost leaks.

    Another thing to look for is a failed swirl flap on the inlet manifold. Look for black oil underneath the inlet manifold on the engine block.

    Paul
     
  4. FAH320

    FAH320 Active Member

    Messages:
    42
    Likes Received:
    0
    Joined:
    Nov 5, 2010
    Location:
    Bursa/Turkey
    Your Mercedes:
    E320 CDI, 2001
    Get the fault codes scanned on star. I had the same problem and it was boost pressure sensor. Replaced it and it is fine since then.
     

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