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2000 740iL Engine idle is normal when starting cold. After a few minutes engine will not idle and engine will stall at idle only. Following code is showing. P0100 ( MASS OR VOLUME AIR FLOW CIRCUIT ) Were do I start? Nathan

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The MAF sensor:-- It senses the amount of air being drawn into the engine and communicates with the computer to adjust fuel levels accordingly. If the sensor is faulty then car will face idle and stall problems. The MAF is located in the air intake tract and is usually held in place by clamps holding the air ducts to the inlet and outlet of the MAF. The MAS has two plastic screens on the front and back. They are secured by metal clip rings that snap inside the frame. These are easy to remove with a screw driver. Just remember that the fine screen goes on the input side (closest to the air box) and the big screen goes on the output side (closest to the engine).The sensor itself is a circuit board-looking protrusion down into the middle of the airflow tube.Try cleaning the sensor before replacing it. You can use Q Tips, rubbing alcohol, and lacquer thinner to clean it.Then insert it and check.If still the same problem then you can get the sensor replaced. Thanks. Keep updated for any more query. You can rate this solution and show your appreciation.

Posted on Jul 07, 2010

  • necapps Jul 07, 2010

    BMW does not recognize the term MAF sensor. However there is a sensor just downstream the filter airbox called the HFM sensor ( Hot Film Air Mass Sensor ). Here is BMW description of the HFM. Is this maybe the same sensor?



    HOT FILM AIR MASS SENSOR (HFM 5)
    The M62 TU is equipped with a new Hot Film
    Air Mass Sensor identified as HFM 5. It is a
    combined air mass/intake air temperature
    sensor. The separate intake air temperature
    sensor is no longer used on the M62 TU.
    The HFM 5 is provided with operating power
    from the ECM main relay. Based on calculated
    intake air mass, the HFM 5 generates
    a varying voltage between 0.5 and 4.5 volts
    as an input signal to the ME 7.2



    An additional improvement of the HFM 5 is that the hot
    film element is not openly suspended in the center bore
    of the sensor as with previous HFMs. It is shrouded by
    a round fronted plastic labyrinth which isolates it from
    intake air charge pulsations.
    This feature allows the HFM to monitor and calculate the
    intake air volume with more accuracy. This feature adds
    further correction for calculating fuel injection “on” time
    (ti) which reduces emissions further.

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