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ML320 ECU random misfire!!!

Discussion in 'Engine, Drivetrain, Fuel and Exhaust' started by ghmd, Oct 15, 2012.

  1. ghmd

    ghmd New Member

    Messages:
    4
    Likes Received:
    0
    Joined:
    Sep 8, 2009
    Your Mercedes:
    ML320
    Please help, my W reg ML320 is badly misfiring! It has been going on for months, I pull away and it goes into limp mode. I turn it off and the problem sometimes clears. On over-taking, it sometimes loses powere and this morning i nearly had an accident. We replaced the oxygen sensor and the problem still happens. I took it to the garage and the diagnostic was 'ECU random misfire'!
    We replaced the MAF sensor and it improved for a while but now it is bad again. It is worse in damp and cold conditions. It is driving me nuts!! Please help!:(
     
  2. WG M-B

    WG M-B Senior Member Authorised Forum Supporter

    Messages:
    3,105
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    2
    Joined:
    Dec 5, 2010
    Location:
    North west london
    Your Mercedes:
    C63 Wagon in black
    Can it not go on star to be checked by somebody???
     
  3. jibcl500

    jibcl500 Senior Member

    Messages:
    6,423
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    Joined:
    Oct 22, 2005
    Location:
    Cambridgeshire
    Your Mercedes:
    CL500,ML55,SLK280
    Could be anything but unless it goes on star diagnostics your p!$$ing in the wind sunshine.

    Coil packs?
    plugs?
    HT leads?
    cats blocked?
    O2 sensors?

    Any dash lights?

    jib
     
  4. WG M-B

    WG M-B Senior Member Authorised Forum Supporter

    Messages:
    3,105
    Likes Received:
    2
    Joined:
    Dec 5, 2010
    Location:
    North west london
    Your Mercedes:
    C63 Wagon in black
    Very well put !!!
     
  5. jibcl500

    jibcl500 Senior Member

    Messages:
    6,423
    Likes Received:
    3
    Joined:
    Oct 22, 2005
    Location:
    Cambridgeshire
    Your Mercedes:
    CL500,ML55,SLK280
    Your also not that far from me so if the ML can get here I can do a free yes free star diags for you, I also have a great many spare parts for the 320 so if we need something I should have it.

    jib
     
  6. OP
    ghmd

    ghmd New Member

    Messages:
    4
    Likes Received:
    0
    Joined:
    Sep 8, 2009
    Your Mercedes:
    ML320
    Where are you? What is star? No dash lights
     
  7. jibcl500

    jibcl500 Senior Member

    Messages:
    6,423
    Likes Received:
    3
    Joined:
    Oct 22, 2005
    Location:
    Cambridgeshire
    Your Mercedes:
    CL500,ML55,SLK280
    CB6 3UL
    Star diagnostics


    jib
     

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