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Thread: Strange n42b20 limp mode

  1. #1
    Join Date
    Aug 2017
    Location
    danmark
    Posts
    7
    My Cars
    E46 318i

    Strange n42b20 limp mode

    Anyone knows why that Happens every 150-200km?
    Motor dies and after restart it jumps like that and wont react when i press gaspedal..
    Timing chain have been changed, the crankshaft sensors have been changed, New maf sensor changed, spark plugs changed, fuel pump/filter/injectors changed problem still not fixed..
    I have to switch off and start the car like 10 times until it comes back to normal for like 10-20 km sometimes up to 200km.
    The only erros i get its from crankshaft sensors but i have changed them 3 times..
    The motor is n42b20...

    https://youtu.be/-a0vVymM1n4

  2. #2
    Join Date
    Jul 2004
    Location
    Houston, TX
    Posts
    12,522
    My Cars
    36 Cylinders
    What was the exact error code number?

    I wonder if this is a code for camshaft to crankshaft mis-correlation instead.
    -Abel

    - E36 328is ~210-220whp: Lots of Mods.
    - 2000 Z3: Many Mods.
    - 2003 VW Jetta TDI Manual 47-50mpg
    - 1999 S52 Estoril M Coupe
    - 2014 328d Wagon, self-tuned, 270hp/430ft-lbs
    - 2019 M2 Competition, self-tuned, 504whp
    - 2016 Mini Cooper S

  3. #3
    Join Date
    Jul 2011
    Location
    Arlington, VA
    Posts
    9,942
    My Cars
    2018 BMW M240i
    Please stop throwing parts at the problem. Doing so wastes money, doesn’t fix the problem and angers the BMW goddesses.

    These car were logically engineered in Munich by BMW engineers. You need to logically troubleshoot any issue. The first step is to scan the engine computer (DME) and the automatic tranny computer (EGS) for codes. Post what you find.

  4. #4
    Join Date
    Aug 2017
    Location
    danmark
    Posts
    7
    My Cars
    E46 318i
    I Will read the errors tomorrow and let u guys know

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