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W124 300CE 24V coupe engine misfiring

Discussion in 'Engine, Drivetrain, Fuel and Exhaust' started by macker64, Nov 19, 2012.

  1. macker64

    macker64 Senior Member

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    Joined:
    Mar 11, 2012
    Location:
    Ireland
    Your Mercedes:
    1997 W210 300 Td & 1991 W124 300CE 24V & 2001 W210 320CDI & W210 E200 1992 W124 300ce 24v sportline
    Morning folks,
    Would appreciate your expert opinions on the following.

    Yesterday afternoon I went for a spin in the 300ce (m104.980 engine) and she started to shudder/misfire when I pulled up to a set of traffic lights.

    Stepped on the go faster pedal and nothing, no acceleration and the engine started to shudder/misfire big time.

    Pushed it to the hard shoulder and switched off. Attempted to restart and again it fired up but was misfiring continuously!

    Todate I have replaced the OVP, Reg pack on alternator and the battery by way of preventative maintenance.

    I have attached a photo of what I believe is the CPS sensor which I understand can cause this misfiring. I measured it this morning and its open cct. I presume this is a hall effect sensor so the resistance reading is probably correct or is it?

    Needless to say after 10mins rest she started right up and drove home without missing a beat.

    Could the Distributor cap and rotor cause this fault?

    I have checked the wiring to the throttle body and fortunately its ok with no sign of dis-integration!

    Anyone experience similar symptoms?

    Regards,
     

    Attached Files:

  2. robparker

    robparker Senior Member Authorised Forum Supporter

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    Joined:
    Apr 18, 2006
    Location:
    Taunton
    Your Mercedes:
    C55 (203), 220d (115), 200d (110)
    yea, dizzy cap and arm
     
  3. television

    television Always remembered RIP

    Messages:
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    Joined:
    Mar 14, 2005
    Location:
    Daventry
    Your Mercedes:
    2002 SL500, 216 CL500, all fully loaded
    As Rob I think, just wiping some PTFE all over the rotor arm and the inside of the cap can help on this
     
  4. rayhennig

    rayhennig Senior Member

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    Nov 16, 2006
    Your Mercedes:
    1991 300CE-24 Sportline
    Yes, I agree 100%.

    It's worth checking all your HT components and DON'T go cheap. I know it's easy for me to spend your money but try to get original MB cap rotor and leads.

    Failing that, in my experience, Bosch or Beru ONLY.

    Oh and make sure you've got the ordinary copper plugs from Bosch, Beru or NGK. Anything exotic is a waste of cash and can cause problems. And any plugs with resistance are right OUT in a standard system.

    To summarise, make sure your HT is 100% before getting morbid and thinking you've got some super-expensive problem.

    R
     
    Last edited: Nov 19, 2012
  5. OP
    macker64

    macker64 Senior Member

    Messages:
    148
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    0
    Joined:
    Mar 11, 2012
    Location:
    Ireland
    Your Mercedes:
    1997 W210 300 Td & 1991 W124 300CE 24V & 2001 W210 320CDI & W210 E200 1992 W124 300ce 24v sportline
    Evening guys,
    I have replaced the distributor cap and rotor arm on the W124 300CE and the engine fired right up and behaved itself on a test drive!!

    Managed to source the parts from ebay Germany for 1/3 of the stealer price!!

    Thanks to all those who replied to my initial request for help!!

    Regards, ;-)
     

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