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Thread: BMW E90 2008 - Misfire on cylinder 2

  1. #1
    Join Date
    Apr 2021
    Location
    Krakow, poland
    Posts
    5
    My Cars
    2008 bmw e90 sedan

    BMW E90 2008 - Misfire on cylinder 2

    folks,

    suggestion requested, kindly help!

    BMW E90 2008 , misfire on cylinder 2 during cold start. After misfire is fixed, approx after running 100kms, misfire will happen when starting the car on cold engine.
    spark plugs replaced 2 times. First NGK and currently BMW spark plugs. Fuel pump replaced. Coils swapped between 1 & 2. Injector swapped between 1 & 2. Still misfire on cylinder 2.

    Available options:
    1. Test all 4 injectors and sometimes testing will do cleaning/fixing also as per mechanic since testing is done by passing high pressure fuel. cost of this will be $250
    2. Replace all 4 injectors, this will cost $1250

    What do you suggest? And what are other things i should ask mechanic to check and tell which will help me diagnose the problem?



  2. #2
    Join Date
    Aug 2008
    Location
    North Potomac, MD
    Posts
    1,054
    My Cars
    2011 E90 328i
    Since you have a cold misfire, and using the throttle, keep the rpm's at say 1200 for 30 seconds or so.

    You problem could be lifter leakdown, as I assume car runs fine otherwise. Any taping on cold start?

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