Mercedes Cclass W204 fault !
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  1. #1
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    Default Mercedes Cclass W204 fault !

    Hi guys wondering if you can shed some light. Tuned my c class merc w204 2008
    Every now and again i get limp mode and engine management light on. Cycling ignition brings it back out of limp. These are the 2 fault codes showing bit contradicting so maybe a faulty fuel pressure regulator !! If so does anyone know where it is and how easy to change.
    Ive noticed right before this happens i get a bit of a judder from the engine
    ive put orig file back in but still happens.

    Thanks
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    Default

    Check the diesel injector

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    dave11674 (24th September, 2017)

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    Default

    Is this one part or the lot ?
    you mean check injectors mate ?
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    Default

    The amount of return fuel from the injectors.

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    how to check
    pull off teh black pipes and see what is returned ?

    dave
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    Default

    Since you have a fault of "pressure to big" it cant be the returnflow on the injectors. I would go for the regulator in the rail (its the one on the end upper in your pic, the other is the fuel pressure sensor)

    regards

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    dave11674 (24th October, 2017)

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    ok guys i finally got this sorted

    bought a use and assured working QCV (top sensor)
    replaced it
    car was warm when we did it and i was driving here n there the rest of the day so was warm all day and no limp or faults popped up
    so thought it was fixed.

    unit i came to it Sunday morning cold start, oh my the engine was revving up and down like it was gasping for fuel
    engine was like shuddering from side to side
    thought it was broken
    so i drove it to my job, and when it warmed up the shuddering and bad running went away !!!

    so thought fluff this
    i and spoke to a mercedes man i know, he said change fuel filter.
    so on monday i went round to mates garage, put orig QCV back on and changed the fuel filter.
    we didnt tip the fuel from the old filter into this new one as it could of had shitty fuel in it.

    cycled the ignition a few times, and was presented now with what sounded like an air leak when we turned on the ignition, in the T piece in the return line..
    i said to my mate i bet its just how it expels air out the system.
    anyways it fired straight up so i went about my business

    this morning my car fired up and purred like a pussy
    not a murmer
    not a ESP light on the dash all day and i was out doing lots of calls today
    usually get it 3 or 4 times a day

    so i think all along it was the fuel filter was a little shitty

    thanks for any pointers here guys

    dave
    Last edited by dave11674; 24th October, 2017 at 10:38 PM.
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    ahhh take it back, went into limp again today

    time to bust out start diagnostics i think heheh
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    Quote Originally Posted by dave11674 View Post
    ahhh take it back, went into limp again today

    time to bust out start diagnostics i think heheh
    I did dpf and egr in an w204 and i get some fuel presure fault also, client said that to me and some times limpmode. Car comes in tmrw... i will check but think is my have to do with the maps in my situation


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    keep us informed mate

    thanks

    dave
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    lush did you get this sorted mate ?

    dave
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    Quote Originally Posted by dave11674 View Post
    lush did you get this sorted mate ?

    dave
    Sorry dave, just seen this i did yes.i blocked egr and all back to nornal


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    hmmm
    you a pointer to where egr is on mine ?

    dave
    thanks
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