clk 230k cylinder 2 misfire

Discussion in 'Engine' started by robjogs, Apr 10, 2014.

  1. robjogs

    robjogs Member

    Messages:
    35
    Joined:
    Mar 16, 2012
    hey wondering if anyone can help my clk has just produced a misfire on cylinder 2 but when I turn the car off and on again its fine until I put my foot down and then tho and behold misfire again...

    would this be a cause of a coil breaking down????
     
  2. DSM10000

    DSM10000 Hardcore MB Enthusiast

    Messages:
    4,023
    Joined:
    Jul 12, 2011
    Location:
    Near Salisbury
    Car:
    E32O CDi Sport, MX5 1.8 Sport, RR 4.2 SC
    Could be a coil, HT lead, spark plug, injector............. Ideally you need to get a Star diagnosis.

    You could try moving a coil pack around an see if the misfire moves, I assume it has one per cylinder?
     
  3. OP
    OP
    robjogs

    robjogs Member

    Messages:
    35
    Joined:
    Mar 16, 2012
    it has a coil on 4 and 2
     
  4. grober

    grober MB Club Veteran

    Messages:
    24,147
    Joined:
    Jun 22, 2003
    Location:
    Perth, Scotland
    Car:
    W204 C200CDI Estate
    It's known as a "lost spark" system. Each coil fires 2 cylinders 1 + 4 and 2 + 3. Usually its one of the coils or the coil extender that goes down below the coil to the plug. If a coil goes bad it sometimes takes out the control transistor/s in the engine ECU.
     
    1 person likes this.
  5. OP
    OP
    robjogs

    robjogs Member

    Messages:
    35
    Joined:
    Mar 16, 2012
    how is it resolved? ??
     
  6. grober

    grober MB Club Veteran

    Messages:
    24,147
    Joined:
    Jun 22, 2003
    Location:
    Perth, Scotland
    Car:
    W204 C200CDI Estate
    As DSM 10000 says best thing is to get the car on an engine analyser. Swapping the coils+extender over may help but the low tension wiring under that cam cover can degrade with the heat so must be handled with great care. If the problem doesn't move to cylinder 4 then the problem is going to be the coil or extender or low tension wiring or ECU output transistor. The coil extenders aren't too expensive so it might be worth changing them first.
     
  7. OP
    OP
    robjogs

    robjogs Member

    Messages:
    35
    Joined:
    Mar 16, 2012
    do u know where I can get just the extender part?
     
  8. DSM10000

    DSM10000 Hardcore MB Enthusiast

    Messages:
    4,023
    Joined:
    Jul 12, 2011
    Location:
    Near Salisbury
    Car:
    E32O CDi Sport, MX5 1.8 Sport, RR 4.2 SC

    A dealer or try ECP etc.
     
  9. OP
    OP
    robjogs

    robjogs Member

    Messages:
    35
    Joined:
    Mar 16, 2012
    ecp only sell the coils
     
  10. WG M-B

    WG M-B Auhorised Forum Sponsor Authorised Forum Sponsor

    Messages:
    1,898
    Joined:
    May 26, 2011
    Location:
    N/W london
    Car:
    C63 Wagon in black
    I would swap the coils to see if the misfire moves first. It could (less likely but possible) be a fuel injector
     
  11. OP
    OP
    robjogs

    robjogs Member

    Messages:
    35
    Joined:
    Mar 16, 2012
    problem solved was the coil extender thanks guys £12.50 cheap fix
     
    1 person likes this.

Share This Page

  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.