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A140 shuts off when engine cold - no fault codes, ECU tested.

Discussion in 'Electrics, Vacuum, Ignition and ECU' started by shahid2000, Nov 27, 2012.

  1. shahid2000

    shahid2000 New Member

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    Surrey
    Your Mercedes:
    A140/1999/1.4L
    I read through the forum and cannot find a solution so posting a new thread.
    I own A140 1999 1.4L. It started 2 weeks ago after I refuelled, the car started ok but was cutting off in idle, acceleration was erratic. I had it checked by my usual garage. The fault code at that time was P0100. I sent the ECU/Mass Air flow meter to ECUTesting and got it repaired.
    After repair it was cutting the engine when idle, acceleration is ok and once the engine teperature is warm then no problem. Mechanic said that he tested coolant temperature sensor which is fine and it must be an ECU problem. I sent it back to ECU testing who have just called and said that there is nothing wrong with it.
    The car was fully serviced and MOTed last month with spark plugs changed.

    what do i do? what it the problem with it?

    Thanks,
     
  2. Miffy

    Miffy Senior Member

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    Your Mercedes:
    CLK 320 CAB Elegance C208
    are you having the codes read on a MB Star system?
     
  3. OP
    shahid2000

    shahid2000 New Member

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    Your Mercedes:
    A140/1999/1.4L
    The garage had some other system but they also got it checked on the STAR system in a nearby Mercedes dealer - still no codes .
     
  4. Miffy

    Miffy Senior Member

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    Your Mercedes:
    CLK 320 CAB Elegance C208
    strange, perhaps someone could explain how you get a fault that logs no faults?
     
  5. OP
    shahid2000

    shahid2000 New Member

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    A140/1999/1.4L
    Even the first time problem started the check engine light was off, when i took it to the garage they connected it to the reader and said there is a fault code stored which was P0100. When ECU testing tested it they also said that there was a problem and they have repaired it.

    No idea what to do now.
     
  6. WG M-B

    WG M-B Senior Member Authorised Forum Supporter

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    C63 Wagon in black
    Crank sensors do not always throw up fault codes. By your symptoms i would not suspect the crank sensor though. Is it hard to start? Once started how does it drive? does it just cut out when coming to a standstill? I would put a fuel pressure gauge on it from start up and go from there. You will not get low fuel presure codes logged
     
  7. WG M-B

    WG M-B Senior Member Authorised Forum Supporter

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    Also once refitting the ecu with a new airmass the adaptation has to be reset on star
     
  8. Alex Crow

    Alex Crow Senior Member

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    Your Mercedes:
    W169, W124, w202, W203, KTM 250 EXC, VW T25 camper and a Polo in a pear tree
    As above, does not fit for crank sensor (as I read it, it always restarts without a cooling period), suspect fuel pressure fault, either because of filter or pump.
     
  9. OP
    shahid2000

    shahid2000 New Member

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    thanks guys .... ECU being fitted today, told the mechanic about your replies ... he will be doing some checks this afternoon. let's see.
     
  10. OP
    shahid2000

    shahid2000 New Member

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    Your Mercedes:
    A140/1999/1.4L
    Still the same issue guys - some more details if it helps

    The car is idling at 650 - according to mechanic it should idle at 900.
    adaptations were reset on STAR.
    ECU tested on STAR no problems found, no fault codes.
    Mass Air flow sensor is taking the correct amount of air.

    No car for 3 weeks and I am bleeding money - please help.
     
    Last edited: Nov 30, 2012
  11. Bolide

    Bolide Senior Member

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    BMW 525 Diesel Touring
    Take it to an expert

    Nick Froome
     
  12. Alex Crow

    Alex Crow Senior Member

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    Your Mercedes:
    W169, W124, w202, W203, KTM 250 EXC, VW T25 camper and a Polo in a pear tree
    Can you confirm that fuel pressure has been tested and found to be OK?

    If not, we cannot really help much, with the chineese whispers.

    So, as above, find someone that works with these cars full time, and is recommended for their MB prowess.
     

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