[W211] Big electronic problems, your advice is much needed!

Discussion in 'Electronics' started by Wonderland, Nov 24, 2015.

  1. Wonderland

    Wonderland New Member

    Messages:
    11
    Joined:
    Oct 8, 2015
    Car:
    Mercedes Benz W211
    Hello,

    This is a rather long story, but I really need some advice on this, so please bear with me.

    It all started about a month after I purchased the car this summer. First symptoms were that car sometimes wouldn't start (dashbord lights all on, engine not turning), which was usually fixed by taking out key and putting in back in, then I could start the car.

    I thought that it may be related to skybreak, but after testing, it didn't turn out to be causing the problem.

    As time passed this started happening more and more often, till eventually I couldn't start the car anymore. So I brought the car to Mercedes specialist who told it's an ECU problem.

    Before changing ECU he explained that when engine couldn't be started it was because ECU couldn't get engine temperature information. And he showed that to me as well - temperature gauge was always with no bars, so he turned the key on and off for quite a few time before eventually temperature gauge showed some bars and car would instantly start.

    After that he changed ECU to a unit from salvaged vehicle and said it has to be reprogrammed to fit to this car. He also said that brand new unit would cost around 1000 pounds.

    After that everything was good for a while, but then yesterday as I was driving engine just stopped and surely when I tried to turn engine back on the temperature gauge was with 0 bars and car wouldn't start.

    And this morning when I tried to start car, it started then after a few moments engine turned off again.

    Specialist is once more saying that this is an ECU problem. This time it is a bit different, since car just stopped while I was driving, which had never happened before the first ECU change, if I could start the car, I could drive with it till the fuel runs out.

    Could there be something else at fault here?
     
    Last edited: Nov 24, 2015
  2. camerafodder

    camerafodder Hardcore MB Enthusiast

    Messages:
    2,529
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    Jul 15, 2007
    Location:
    South Lakes (UK) and Colorado
    Car:
    VW Touareg V6 Altitude, Toyota IQ2
    I'd be checking the temp sensor itself or the connection to it.
     
  3. OP
    OP
    Wonderland

    Wonderland New Member

    Messages:
    11
    Joined:
    Oct 8, 2015
    Car:
    Mercedes Benz W211
    I have changed temperature sensor and oil temperature sensor even.
     
  4. maha

    maha Hardcore MB Enthusiast

    Messages:
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    Car:
    Suzuki Alto
    which w221 is it
     
  5. OP
    OP
    Wonderland

    Wonderland New Member

    Messages:
    11
    Joined:
    Oct 8, 2015
    Car:
    Mercedes Benz W211
    It's W211, e220 2.2 CDi, automati, estate
     
  6. guydewdney

    guydewdney Hardcore MB Enthusiast

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    Porlock, Zomerzet
    Car:
    906 Sprinter 313cdi
    mine ran fine (albeit in limp) with a 'mad' temp sensor, that went from freezing to 200 degrees in seconds. so it shoild start with no sensor at all.
     
  7. OP
    OP
    Wonderland

    Wonderland New Member

    Messages:
    11
    Joined:
    Oct 8, 2015
    Car:
    Mercedes Benz W211
    I will keep that in mind, thank you! What did you mean by "limp".
     

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