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C220cdi om651 has me baffled

Discussion in 'Engine, Drivetrain, Fuel and Exhaust' started by Mattyb1984, Oct 27, 2020.

  1. Kev555

    Kev555 Senior Member

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    Joined:
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    Location:
    N.I
    Your Mercedes:
    2011 vito 113 CDI OM651 W639 panel van
    I had similar problem with my OM651 and cylinder 3 as well back over a year ago, dont quote me but as far as i can remember i switched injectors around too to see which injector was faulty or was it wiring looms? I found strangely enough that even changing injectors around cylinder 3 always turned out to be the cylinder at fault. Its sounds crazy but the ECU was playing tricks with me. A new set of injectors cured the problem, My advice is get a set of injectors tested then try them as cylinder 2 injector from memory was the worst injector when got my old ones tested.
    The cylinder balance you posted looks all too familiar to me as well Matty:rolleyes:
    Just to add ive read through all your posts and ive jumped through a few of those hoops and I'm well convinced its injectors as you've ruled out other things as I did . I discredited the injectors myself for long enough mainly because of the cost involved but wish I had tested them earlier
     
    Last edited: Oct 28, 2020
    Jim2 likes this.
  2. OP
    Mattyb1984

    Mattyb1984 Member

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    Oct 25, 2020
    Your Mercedes:
    C220CDI
    I've actually read through your threads Kev which is why I too am convinced it's the injectors but leak off tests, it not moving from cylinder to cylinder like other cars do had me second guessing which is why I was reluctant on buying a new set of injectors. I have however found a few things out about these om651 engines. The main thing being not to buy one with issues :D:D

    I will order some injectors tomorrow and post the results as soon as they come.
     
    Jim2 likes this.
  3. mattkh

    mattkh Senior Member

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    Your Mercedes:
    W168 1999 1.6
    Hi
    Are these injectors piezo ones?
     
    Jim2 likes this.
  4. Kev555

    Kev555 Senior Member

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    Your Mercedes:
    2011 vito 113 CDI OM651 W639 panel van
    Yes I believe mine were as they were Delphi
     
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  5. Kev555

    Kev555 Senior Member

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    Your Mercedes:
    2011 vito 113 CDI OM651 W639 panel van
    Yes Matty I thought the same after I bought mine and discovered issues:rolleyes:, but after going bald from pulling my hair out over a period of time I'm in a happier place now with less hair:D, they seem a good engine when running sweet and a nice response from remapping
     
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  6. Malamadre

    Malamadre New Member

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    Your Mercedes:
    S205, 2014, OM651
    Hello, sorry to rush in like this on the forum. But I came across your topic via google and I have exactly the same problem with my c class.

    The car isn't moving now since the start of december 2020. Pulled almost half the engine apart but could not find anything. I'm starting to lose my mind.

    Have you figured out what the problem was/is with your car? I would highly appreciate it.
     
  7. OP
    Mattyb1984

    Mattyb1984 Member

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    Your Mercedes:
    C220CDI
    Hi, yes to update this thread both cars were finally repaired. So the first repair was on the engine freshly rebuilt, this turned out to be a sticking valve on cyclinder 3. After reluctantly pulling the head i found it. So then i moved onto the second car and proceeded to remove the head also. This one i found the piston on number 3 had worn, replaced piston and rings.

    The lesson i have learnt would be to ignore the diagnostics and compressions readings from them and go back to basics. Because i was following the diagnostics i spent 4 times as much time on these two cars.
     
    Mark A likes this.
  8. ajlsl600

    ajlsl600 Senior Member

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    Location:
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    Your Mercedes:
    clk3202001,sl6002003 with everything regrettably sold ,A class 170cdi auto. NG/TF1800 ML250
    Its a constant thing is it not.makers making Even the most basic of tasks MORE difficult.given that we mastered this task more than 80 yr ago.one must conclude this is deliberate act /design of maker.no ?
     
  9. ajlsl600

    ajlsl600 Senior Member

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    Your Mercedes:
    clk3202001,sl6002003 with everything regrettably sold ,A class 170cdi auto. NG/TF1800 ML250
    Wot a surprise ,not!!!
     
  10. ajlsl600

    ajlsl600 Senior Member

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    Your Mercedes:
    clk3202001,sl6002003 with everything regrettably sold ,A class 170cdi auto. NG/TF1800 ML250
    So valve sticking ,must have been in open position , so was piston pushing it back up or there was clearance ,also must have been bad ? To overcome spring trying to shut it ? Valve bent ? In either case would have though comp test would have to show something ? If now running ok grand .
     
  11. MinionBob

    MinionBob Senior Member

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    Your Mercedes:
    Viano - 2012 - OM651 Engine - 2.2
    Who would have thought it; two different vehicles with identical issues but different solutions. I wonder what the chances of that are?!

    Thanks for the update
     
  12. Malamadre

    Malamadre New Member

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    Your Mercedes:
    S205, 2014, OM651
    Thank you for the reply. These were also some of the things I kept in mind but ignored because I couldn't believe this would happen with such a young car even though it has almost 180k miles.

    Now time to figure out wich one is the case with my car.
     
  13. Kev555

    Kev555 Senior Member

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    Your Mercedes:
    2011 vito 113 CDI OM651 W639 panel van
    Start off with the basics Malamadre like I was told on here by a few members that have been through it like compression test first and work outwards
     

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