E39 540IA running rough and throwing codes

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  1. E39 540IA running rough and throwing codes 
    #1
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    AfterHouR's Car Details
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    Hi everybody

    Please can you help me with getting my car running right, it is so unreliable at the moment with running rough and cutting out.

    I have ran INPA on my laptop, cleared the fault codes but it keeps coming back with fault code 136 and 140

    What do they mean and how do I fix it (I'm on a tight budget and can't afford to take it to stealer)

    Thanks in advance for any help.

    Regards
    AfterHouR
     
     

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    #2
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    joylove's Car Details
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    It's probably a cam or crank position sensor. Are you sure INPA doesn't give you more diagnostic data than those two codes?

    The readouts are usually pretty detailed, although you might need to run them through Google translate.

     
     

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    #3
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    Hi
    Thanks for replying

    Yes here is what I got from it:-

    136 Test emergency air position
    Error frequency : 1
    Logistic counter: 40
    Supply voltage 11.96 V
    Intake air temperature 7.50 Grd C
    wdknlp 15.69 %
    Setpoint DK-angle at NLP-position 15.68 % DK --
    Error tested
    Test emergency air position faulty current, -- -- --
    Test emergency air position faulty Initial, --
    CARB debounce

    140 Output Thermostat Map cooling
    Error frequency : 1
    Logistic counter: 40
    Engine speed 1240.00 /min
    Engine temperature 3.00 Grd C
    Intake air temperature 3.75 Grd C
    Supply voltage 10.17 V
    Error currently available Error tested -- -- -- -- -- -- -- -- Signal-/Path discontinuity current, -- -- --
    Signal-/Path discontinuity Initial, --
    E-Flag debounce
    CARB debounce
    SCATT-active


    Regards
    AfterHouR
     
     

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    #4
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    Hmm, can't say that makes a lot of sense to me, but your symptoms sound like the classic duff Cam/crank sensor which is a common problem. Have a Google to see if you can find anyone with the same sort of issues and a solution.
     
     

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    #5
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    I did try google first, I trawled through pages and pages for about three hours and didn't find an answer to 136
    140 could be faulty wiring or stat or both
    I think I will try looking for an air leak first as its running rough plus I have ran the LU test and the reading for each cylinder are all over the place :(
     
     

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    #6
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    Yep air leak is a good free thing to test, although that is usually accompanied by warnings for running lean Bank1/Bank2 because the car has too much air in the mixture.

    If it's running like an utter lumpy dog especially at about 3000RPM (VANOS changeover) I'm betting a position sensor, I don't think they have built in diagnostics so don't show up as the direct fault.

    Does google say you can unplug the sensor and go back to a default "safe" setting for a smooth running?
     
     

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    #7
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    Im pretty sure the 136 is a faulty throttle...


    136 Throttle Emergency Operation Point




    EndTuning - BMW Codes
    330i sport a big chunk of berlin...

     
     

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    #8
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    A step further

    got this from GT1 DIS

    dme - 73 dme: signal hot-film air-mass flow sensor
    dme - 8c dme: activation, map cooling

    and
    dme - 79 dme: CAN signal wheel speeds (have replaced o/s/r sensor but still hasn't cleared and dsc now off)

    will deal with speed sensor later, need to get running properly first
     
     

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    #9
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    The Map controlled thermostat is very common and unlikely to be the problem, over half the cars with the electronic thermostats that I scan have it as an error with no ill effects.

    The MAF signal is more likely to be the cause.
     
     

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    #10
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    New MAF then at 96K I don't think it will be worth cleaning do you?

    Am I correct I am sure I read somewhere the VW MAF sensor is the same?
     
     

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