W163 ML270 CDi won't start when hot.

Discussion in 'Engine' started by andywsr, Apr 14, 2014.

  1. andywsr

    andywsr New Member

    Messages:
    8
    Joined:
    Nov 6, 2011
    Car:
    ML 270 CDi
    Hi,
    My Ml 270 has developed a problem causing it to not start when hot or warm.
    The engine turns over but will not fire, like it's not getting fuel.
    Local garage has scanned the vehicle and found no faults which would cause the problem.

    Has anyone had this problem before?

    If so what was the problem and the cure?

    Thanks in advance
     
  2. Hartzpartz

    Hartzpartz Hardcore MB Enthusiast

    Messages:
    223
    Joined:
    Feb 26, 2005
    Location:
    Sompting, West Sussex
    Car:
    E200 W210 (ex 500SL, ML55 and 190 Cosworth owner).
    Fuel system air leaks? Has the fuel filter been changed recently?
     
  3. OP
    OP
    andywsr

    andywsr New Member

    Messages:
    8
    Joined:
    Nov 6, 2011
    Car:
    ML 270 CDi
    Hi,
    no fuel system filters changed recently.
    Once engine has cooled down it starts and runs fine.
    There are no visable leaks from anywhere.
     
  4. panason1c

    panason1c Hardcore MB Enthusiast

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    Car:
    ML270cdi, VW Polo 1.9 tdi, BMW K1200rs
    Might be the crankshaft position sensor faulty.... whilst cranking (when it won't start) , does the rev counter needle move?....if it doesn't, the cps needs replacing.
     
    Last edited: Apr 14, 2014
  5. OP
    OP
    andywsr

    andywsr New Member

    Messages:
    8
    Joined:
    Nov 6, 2011
    Car:
    ML 270 CDi
    Ok thanks I'll check it out
     
  6. BlackC55

    BlackC55 Authorised Forum Sponsor Authorised Forum Sponsor

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    Or an injector is leaking off to much.
     
    1 person likes this.
  7. Hartzpartz

    Hartzpartz Hardcore MB Enthusiast

    Messages:
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    Joined:
    Feb 26, 2005
    Location:
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    Car:
    E200 W210 (ex 500SL, ML55 and 190 Cosworth owner).
    I'm with Panason1c on the CPS sensor theory. :) Had the same 'hot' fault on my ML55 and a new sensor cured the problem.
     
  8. OP
    OP
    andywsr

    andywsr New Member

    Messages:
    8
    Joined:
    Nov 6, 2011
    Car:
    ML 270 CDi
    Ok thanks for the info
     
  9. davidjpowell

    davidjpowell Hardcore MB Enthusiast

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    I'm with BlackC55. He knows his stuff and I've also seen this fault in the same way.
     
  10. WG M-B

    WG M-B Auhorised Forum Sponsor Authorised Forum Sponsor

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    It's very likely olly is right. Easiest way to tell is some high ignition in a can (ie easy start). If she fires and runs it'll be an injector
    If not look else where
     
  11. oilslick

    oilslick New Member

    Messages:
    7
    Joined:
    Jul 12, 2013
    Car:
    mercedes clk270 cdi
    hard to start

    My clk 270cdi was getting harder to start when hot, it was ok when cold, had it diagnosed as injector fault, needed 2 reconditioned at £120.00 each.
     
  12. OP
    OP
    andywsr

    andywsr New Member

    Messages:
    8
    Joined:
    Nov 6, 2011
    Car:
    ML 270 CDi
    Just a quick update. I can confirm having replaced the Crank Position Sensor that was indeed the problem. All now working perfectly. Thanks for the help.
     
    1 person likes this.
  13. Daisydog

    Daisydog New Member

    Messages:
    20
    Joined:
    Oct 18, 2015
    Car:
    Ml270
    Crankshaft position sensor was problem with mine , cranked over but wouldn't start , changed sensor all sorted now !
     
  14. vee.84

    vee.84 New Member

    Messages:
    2
    Joined:
    Feb 7, 2016
    Car:
    Mercedes Benz ML 400 CDI
    Hi guys i have a ml 400 cdi with exact same problem cranks when hot but no start ive changed crank and cam sensors but still same but the guy i got it from couple weeks ago did say he changed fuel filter could this be something to do with problem hartzpartz any idea guys apart from this car drives lovely with no issues
     
  15. Hartzpartz

    Hartzpartz Hardcore MB Enthusiast

    Messages:
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    Location:
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    Car:
    E200 W210 (ex 500SL, ML55 and 190 Cosworth owner).
    I would carefully check all fuel line connections to the fuel filter and the 'O' ring seals for deteriation or damage. If there is a screw top to the filter housing, make sure this is seated/sealed correctly (no leaks etc. ). Any air drawn into the system could create problems. Hope you get it sorted soon.
     
    1 person likes this.
  16. panason1c

    panason1c Hardcore MB Enthusiast

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    Location:
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    Car:
    ML270cdi, VW Polo 1.9 tdi, BMW K1200rs
    .......or, in this case with the cps having already been changed, I would suspect a faulty injector..... and I would carry out a leak-off test
     
  17. vee.84

    vee.84 New Member

    Messages:
    2
    Joined:
    Feb 7, 2016
    Car:
    Mercedes Benz ML 400 CDI
    Gona get this checked out at end of month hopefully just want to know what i should tell him to check out if air was being drawn in wouldnt it it not start from cold cause mine starts fine cold just when hot ?
     
  18. Hartzpartz

    Hartzpartz Hardcore MB Enthusiast

    Messages:
    223
    Joined:
    Feb 26, 2005
    Location:
    Sompting, West Sussex
    Car:
    E200 W210 (ex 500SL, ML55 and 190 Cosworth owner).
    I must admit, it does sound more like more of a CPS problem but as you have changed that already.....?
    Suspicious that problem occurred after fuel filter change so definitely worth a close inspection of the filter and adjoining pipe work.
     

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