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S320 CDI W221 intermittent starting problem

Discussion in 'Engine, Drivetrain, Fuel and Exhaust' started by Dogma, Mar 10, 2014.

  1. Dogma

    Dogma New Registration

    Messages:
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    Joined:
    Mar 10, 2014
    Location:
    UK
    Your Mercedes:
    S-class/2007/S320
    Hi All,

    This is a great site and I thought I would write my first post to get some help from the experts on this forum.

    I am experiencing intermittent starting problems with my S class. Eight times out of ten it will fail to start first time. After turning the key in the ignition (and holding) the engine with crank/turn but then cut out before cranking again and eventually starting. It has never failed to start but can take up to five turns/cut out cycles before starting. This happens irrespective of whether it is a cold or warm start.

    So far the mechanic has tried the following:
    - Replace the relay
    - Replace the crankshaft sensor
    - Tried starting using the spare keys to ensure there wasn't a problem with the main key.

    None of the above has worked. Any advice would be gratefully appreciated.

    By the way, not sure if it is a related issue, but I have noticed the gear change to be a little lumpy/jerky at times, especially in lower gears.

    Vehicle details: S320 CDI, W221, 54K miles, 2007 model

    Thanks in advance :)
     
  2. renrutp76

    renrutp76 Senior Member

    Messages:
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    Joined:
    Mar 27, 2012
    Location:
    Chester
    Your Mercedes:
    X218/2014/CLS250CDI_W211/2005/E500 Avantgarde
    Have you had any diagnosic checks run? Is rail pressure ok? is there any sign of air in the clear section of the fuel lines.

    Hope this helps, best to get it checked on a Star diagnostic.
     
  3. Stability

    Stability Senior Member

    Messages:
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    Joined:
    Jan 11, 2014
    Location:
    UK
    Your Mercedes:
    Mercedes
    Lets be clear before you head up the wrong path - you may have already !

    Cranks but then cuts out - then restart it starts ?

    What cuts out - the starter starting ?
     

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