CLK 320cdi V6 (OM642) 'Hot Start' issue.

Discussion in 'Engine' started by seymansey, Feb 16, 2015.

  1. seymansey

    seymansey Active Member

    Messages:
    734
    Joined:
    Apr 6, 2007
    Car:
    2006 CLK 320cdi Avantgarde
    I can't figure this one out.

    Car has done 110k.

    Cold starts in the morning are no problem.

    Drive the car up to temperature. Do a short stop off, such as a shopping trip - about 20-30 minutes, car will start, but almost fails to 'catch' and splutters on startup. Drive is perfect.

    Drive the car up to temp, for a long journey, stop engine for a longer period (hour or more, or until next morning) and car will start perfectly.

    Only seems to be warm starts. On one occasion it 'caught' and then cut out. Fired right back up after that.

    High pressure pump is brand new, as it was lazy starting on cold mornings which cured it.
     
  2. DrFeelgood

    DrFeelgood MB Enthusiast

    Messages:
    9,248
    Joined:
    Nov 10, 2005
    Car:
    BMW 740Li
    It was injectors when I had the same symptoms, doesn't mean that your's is the same.

    Incidentally, a whiff of that jet fuel spray up the air intake got it started every time.
     
  3. mersum1es

    mersum1es MB Enthusiast

    Messages:
    1,293
    Joined:
    Aug 9, 2012
    Location:
    Finland
    Car:
    W219, W220
    Injectors are usually leaking more at cold, which does not say it wouldn't be injector fault in this case too. Do a leak test, this time at warm engine.

    Instead cold start ok but warm car starting problems are very often crank positions sensor related (sometimes cam position sensor).
     
  4. mr. shr

    mr. shr MB Enthusiast

    Messages:
    1,879
    Joined:
    Apr 22, 2004
    I'm thinking crank position sensor too.
     

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