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Thread: M52 loss of power fixed ! Crank sensor and 02 sensors

  1. #1
    Join Date
    Apr 2017
    Location
    Newcastle upon tyne
    Posts
    1
    My Cars
    1998 328i coupe

    M52 loss of power fixed ! Crank sensor and 02 sensors

    Hi, I'm just writing as a bit of advice for anyone who has suffered loss of power in their M5x engine in the e36 or e39 . Symptoms were loss of power when warm and power surges on wide open throttle, between 2000-4500 rpm. When cold it ran fine and pulled hard .
    I changed the crank sensor and it made a little difference, but not 100% . I then bit the bullet and fitted 2 new NTK o2 sensors and that fixed the issue, runs fine hot or cold. I knew it was a sensor which controlled fuelling because cold it runs on a base map and ignores sensor input. The car has 220,000 miles on it and the lambda sensors were the originals ! Well worth changing its transformed the car, much stronger mid-range.

  2. #2
    Join Date
    Nov 2016
    Location
    texas
    Posts
    520
    My Cars
    1998 328is
    did you have a check engine for any sensors? i changed my 02 sensors but it still hesitates at 3.5k and whenever its cold it will rev up fine but when warm i will rev it up, the rpm needle will fall more slowly and stop at 1k revs then fall down to normal idle.
    98 328is/5 Arctic silver
    99 528i 5speed Alpine white(Totaled Unfortunately)
    Oil pan and timing chain delete, weight reduction right?
    98 540i/6 (New baby)











  3. #3
    Join Date
    Dec 2013
    Location
    Chicagoland area
    Posts
    4,372
    My Cars
    EXOTICS
    A diagnostic scan with a BMW specific scan tool/software, may provide an answer or clue.

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