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Thread: cyl 3 misfire.

  1. #1
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    cyl 3 misfire.

    i keep getting a cyl 3 misfire on high sped, usually shifting from 3 to 4th gear Click here to enlarge. the car has fbo +meth. i also get a hpfp code for some reason. please help, thanks.

    29CF
    29CF Misfirings, cylinder 3
    Error will cause a warning light
    Error is not currently present
    Test conditions have been completed
    Short circuit or signal interruption

    Click here to enlargeFreeze Frame Information Event 1
    Odometer 65672kms 40806miles
    Engine temperature 96.00 C
    load value for misfire detection 96.88 %
    Engine speed 5,056.00 rpm
    Lambda integrator group 1 22.66 %
    Click here to enlarge

  2. #2
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    How old are the plugs? Have you tried the normal plethora of diagnostic steps? Tried swapping coil to another cylinder?
    2011 E90 M3 \ Melbourne Rot Metallic

    Click here to enlarge

  3. #3
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    Click here to enlarge Originally Posted by lulz_m3 Click here to enlarge
    How old are the plugs? Have you tried the normal plethora of diagnostic steps? Tried swapping coil to another cylinder?
    no i havent, the are less than 15k miles old.i also did my vales with it. i doubt is the coil. car runs great sometimes.
    thanks
    Click here to enlarge

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    I would swap the coil first to rule that out, than swap plugs. Basically start going down the list from cheapest to most expensive. Coils plugs should be first step.
    2011 E90 M3 \ Melbourne Rot Metallic

    Click here to enlarge

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    i did couple logs, i think this one is when the misfire happen
    Click here to enlarge
    Click here to enlarge

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    this one with no misfire, but i slowed down when the car got to shifted.
    Click here to enlarge
    Click here to enlarge

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    more ffd from a diffrent day,it seem it happens ear at 5k rpm. im gonna swap coils first, then plugs but i would need a socket...
    29CF
    29CF Misfirings, cylinder 3
    Error will cause a warning light
    Error is not currently present
    Test conditions have been completed
    Short circuit or signal interruption

    Click here to enlargeFreeze Frame Information Event 1
    Odometer 65544kms 40727miles
    Engine temperature 96.00 C
    load value for misfire detection 50.39 %
    Engine speed 5,248.00 rpm
    Lambda integrator group 1 24.22 %

    Event 2
    Odometer 65544kms 40727miles
    Engine temperature 99.00 C
    load value for misfire detection 97.66 %
    Engine speed 5,120.00 rpm
    Lambda integrator group 1 28.91 %
    Event 3
    Odometer 65656kms 40796miles
    Engine temperature 99.00 C
    load value for misfire detection 98.44 %
    Engine speed 5,152.00 rpm
    Lambda integrator group 1 28.91 %
    Click here to enlarge

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    Swap coils , sparks first to see if the problem follows it. Easy way to test it. If its still there then swap injectors but make sure you code the cylinder for injector swapping

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    ive been doing a lil research and i think its the injector thats going bad Click here to enlarge
    i will be swapping the coils and plugs first b4 getting a new injector.

    thanks for the help guys!
    Click here to enlarge

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