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firing on 3 cylinders

Discussion in 'Electrics, Vacuum, Ignition and ECU' started by gordon100, Nov 13, 2012.

  1. gordon100

    gordon100 New Member

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    Joined:
    Nov 13, 2012
    Location:
    tullibody alloa clackmannanshire
    Your Mercedes:
    c180 1997 1800
    hi
    can any one help my 1997 c180 when it heats up it starts to fire on 3 cylinders i have put new plugs in and i have put new coil packs in but it is still firing on 3 can anyone help please.
     
  2. brandwooddixon

    brandwooddixon Senior Member

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    Joined:
    Jul 31, 2006
    Location:
    Wolverhampton
    Your Mercedes:
    CL500 Bluefficency 2012
    Have you tried disconnecting the MAF?
    Sometimes when this fails it can give misfiring symptoms but doesn't tend to light the Engine Warning Lamp.
     
    Last edited: Nov 13, 2012
  3. OP
    gordon100

    gordon100 New Member

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    Joined:
    Nov 13, 2012
    Location:
    tullibody alloa clackmannanshire
    Your Mercedes:
    c180 1997 1800
    hi
    tried that car just the same
     
  4. jibcl500

    jibcl500 Senior Member

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    Joined:
    Oct 22, 2005
    Location:
    Cambridgeshire
    Your Mercedes:
    CL500,ML55,SLK280
    Compression test is the next thing to do.

    jib
     
  5. Steve@Avantgarde

    Steve@Avantgarde Forum Supporter Authorised Forum Supporter

    Messages:
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    Joined:
    Dec 8, 2009
    Location:
    Bristol/Somerset
    Your Mercedes:
    C220CDI AMG Line Premium, SLR McLaren Roadster, SL55 & C32AMG
    I would say check the wiring that goes around the back of the rocker cover that feeds the ignition coils would be the next thing to do. Often the loom goes brittle, rubs through and arcs or breaks and cuts the power to the coil.
     
  6. Some guy on the internet

    Some guy on the internet Senior Member

    Messages:
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    Your Mercedes:
    A few.
    OP, what are the first 6 numbers of your engine number? It'll be on your V5C.
     

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