E39 540IA running rough and throwing codes - Page 2

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    #11
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    73 hex =115 dec
    8C hex = 140 dec
    79 hex = 121 dec

    According to End Tuning

    115 Mass Air Flow Sensor Signal
    140 Map Cooling Thermostat Activation
    79 = Not listed at The End

    This doc says for a 319i http://websunrise.org/manuals/auto/bmw/319.pdf


    79 Camshaft Angle Pulse Generator

    So you have 3 sensors that you could possibly unplug to see if it will at least run right, MAF, Cam Pos Sensor, Throttle position sensor.

    Obviously check each one in turn, since with a single missing sensor it may revert to a 'safe' map.
    http://websunrise.org/manuals/auto/bmw/319.pdf
     
     

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    #12
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    79 hex = 121 dec.
    HFM (MAF) Load signal

    EndTuning - BMW Codes

    That's assuming it is an M5.2 ecu which it may not be.

    There is no year in the title, so it may be the later Vanos engine with the DME 7, which would give the codes as MAF, Thermostat and wheel speed signal.
     
     

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    #13
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    BMW Fault code 140 is MAP cooling, which will be down to a knackered thermostat.

    BMW fault code 136 is Function check, throttle, emergency operating point.

    Sent from my Sega Megadrive using electricity.
     
     

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    #14
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    For the fault code 136 I would suspect the throttle body.

    Sent from my Sega Megadrive using electricity.
     
     

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    #15
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    Sent from my Sega Megadrive using electricity.
    Attached Images
     
     

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    #16
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    It is the ME7.2 on a 10/98 540IA

    So code 136, does that mean it could be letting air in at the throttle body? or have I totally got hold of the wrong end of the stick?

    Common sense prevailing, I should check this before ordering a new MAF
     
     

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    #17
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    found this on Fleabay if i need a MAF AIR FLOW METER 0280217814, 0280 217 814, 13621433567 ROVER, BMW X5, 540i, 740i | eBay

    I have found another problem though when I got in the car, the drivers side footwell is wet, on closer inspection the sunroof seal has split at the back and the way it was parked over the last few days it has just been running down the headlining and windscreen pillar, right into the footwell.

    SO it looks like I need a new sunroof seal too....
     
     

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    #18
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    No, more likely a electrical issue with wiring or a throttle body fault or sensor on the throttle body.
    See the picture I posted above.

    Sent from my Sega Megadrive using electricity.
     
     

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    #19
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    no fecker listened to me, you must be more authoritive ronnie
    330i sport a big chunk of berlin...

     
     

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    #20
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    Thanks dailydoggy. I haven't had chance to do any more fault finding yet as I am still trying to dry out the interior with a dehumidifier...
    I have sprayed the MAF with contact cleaner and checked for vacuum leaks after the sensor, the Resonator box wasn't bolted down, so I have sorted that and I have sprayed contact spray on the connections on the throttle body.
    Once it stops P....ersistantly raining, I will fire her back up again with the GT1 and see whats what...
    Still need to find out where the leak is coming from though.
     
     

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