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W209 CLK270 CDI smoky on acceleration

Discussion in 'Engine, Drivetrain, Fuel and Exhaust' started by Angeloj, Oct 21, 2012.

  1. Angeloj

    Angeloj Senior Member

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    Location:
    Norwich
    Your Mercedes:
    W209 CLK270CDI Avantgarde
    Hi guys, just wondered if these engines are notorious for chucking out a noticeable amount of fart on heavy acceleration and when overtaking etc? Mine has done 118k miles fully serviced and running fine, but when I look in the rear view mirror I do notice a cloud of smoke!
    Any ideas?

    Thanks Jono
     
  2. sfc501

    sfc501 Guest

    Mine does the same and I feel embarressed by it, after all it's a Mercedes..
     
  3. OP
    Angeloj

    Angeloj Senior Member

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    Your Mercedes:
    W209 CLK270CDI Avantgarde
    That's my exact sentiment!!!
     
  4. oigle

    oigle Senior Member

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    Your Mercedes:
    Currently 2003 ML270. 2012 Nissan Maxima 250SL.
    Highly likely to be a malfunctioning EGR valve. Quite common. Why not consider doing an EGR delete? Very good mod.
    Check out the post on the subject by dieselman.
     
  5. OP
    Angeloj

    Angeloj Senior Member

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    W209 CLK270CDI Avantgarde
    Oh ok, what does that do?? I guess I'll have to find the link unless you know where it is??
     
  6. OP
    Angeloj

    Angeloj Senior Member

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    Just found the post! Very interesting reading but will have to have a think first!!
     
  7. oigle

    oigle Senior Member

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    Your Mercedes:
    Currently 2003 ML270. 2012 Nissan Maxima 250SL.
    Very inexpensive and well worth the effort. No one has yet found a downside.
     
  8. OP
    Angeloj

    Angeloj Senior Member

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    Your Mercedes:
    W209 CLK270CDI Avantgarde
    My only concern would be the increased warm up time because its only 10 makes to work and it takes long enough as it is !
     
  9. oigle

    oigle Senior Member

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    Your Mercedes:
    Currently 2003 ML270. 2012 Nissan Maxima 250SL.
    Yes, does take longer to warm up for sure. Have to be sure to have a perfectly operating thermostat.
     
  10. OP
    Angeloj

    Angeloj Senior Member

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    Your Mercedes:
    W209 CLK270CDI Avantgarde
    I had mine replaced in June so all is well! Just got to find a coolant leak I've developed!!
     
  11. David Nock

    David Nock Senior Member

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    Your Mercedes:
    CLK/2009/320CDI
    Yes, my 2004 270 CDI CLK did exactly that even from demonstator miles (bought at 5000 miles).

    Driving into sun with a hot engine and then overtaking, look in the rear view mirror and cor blimy!
    Typical characteristic of the engine I was assured. It cleans itself on longer runs.
     
    Last edited: Oct 23, 2012
  12. oigle

    oigle Senior Member

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    Joined:
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    Your Mercedes:
    Currently 2003 ML270. 2012 Nissan Maxima 250SL.
    Don't believe everything you are told. If you do the egr delete, the smoke is virtually a thing of the past.
     

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