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  1. #1
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    N54 Spark Plug Change and Odd looking Cyl 1 plug

    I changed my plugs on my 335 Saturday and all went smoothly except for Cylinder #1 . Just loosening the plug was an MF'er and the plug looked very different from the other 5 plugs. It was darker and had noticeable carbon build up on the electrodes and even right before the lower threads (probably why it was so hard to get off).


    I need any experience or expert opinions on why the Cylinder #1 plug looks so different. Cylinder #6 plug was a bit darker as well, but not like #1 .


    I am FBO with BB (BMS) Backend Pump Flash G5 ISO on Map 5. No E85


    Let me know what you guys think.




    All plugs Cyl 1 thru 6 (left to right)


    Click here to enlarge




    Cylinder 1 plug up close


    Click here to enlarge


    All plugs again


    Click here to enlarge
    Click here to enlarge
    '07 E90 335i AW 6MT Sport & Comfort Pkgs
    MODS: |COBB AP | CP-e | ER | Forge | DCI | KW V1 | M3 Sways | BBS CH | M3 Body Parts| MTech | CF Wrap Trim

  2. #2
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    Fuel injector spray pattern, perhaps?

    Neil

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    Interesting....wasn't thinking injector.

    I'm going to take a few better pics of all 6 and cyl 1 tonight and upload them.
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    '07 E90 335i AW 6MT Sport & Comfort Pkgs
    MODS: |COBB AP | CP-e | ER | Forge | DCI | KW V1 | M3 Sways | BBS CH | M3 Body Parts| MTech | CF Wrap Trim

  4. #4
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    Yea that looks like fouling from a rich burn or slightly uneven burn/spray pattern. It's not oil, when it looks more soot-y and not wet, it's usually unburnt fuel.
    E88 N54 w stuff
    F30 335 X-Drive EBII....PPK otherwise Stock
    Click here to enlarge

  5. #5
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    Click here to enlarge Originally Posted by 135pats Click here to enlarge
    Yea that looks like fouling from a rich burn or slightly uneven burn/spray pattern. It's not oil, when it looks more soot-y and not wet, it's usually unburnt fuel.
    Definitely not oil (thank God) and its dry.....I guess I should look at replacing that injector.
    Click here to enlarge
    '07 E90 335i AW 6MT Sport & Comfort Pkgs
    MODS: |COBB AP | CP-e | ER | Forge | DCI | KW V1 | M3 Sways | BBS CH | M3 Body Parts| MTech | CF Wrap Trim

  6. #6
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    Click here to enlarge Originally Posted by bigdaddycane Click here to enlarge
    Definitely not oil (thank God) and its dry.....I guess I should look at replacing that injector.
    What kind of AFR does the pump flash target? I've never run the JB before so not as used to what it tries to hit/keep within the trim boundaries of.

    It could be something as simple as a rich burn. Either way it's not a critical issue if the car is otherwise happy. It could potentially be a tired injector for sure.
    E88 N54 w stuff
    F30 335 X-Drive EBII....PPK otherwise Stock
    Click here to enlarge

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