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Thread: Spark Plug Color after Running a Few Tanks

  1. #1
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    Spark Plug Color after Running a Few Tanks

    I pulled a plug from each bank and they look almost identical in coloring, but I am curious why plug is so lean on one side? I am guessing that lean side is facing away from intake valve?

    IMG_20180227_174001109.jpg

    IMG_20180227_174040813.jpg

  2. #2
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    What year is your car, JDP530? The spark plugs I got in my car is the OEM recommended ones (the one with 1K OHM internal resistance). My plugs are similar in color too but not as white as yours on the half side. There's some brownish color to mine. Maybe yours hasn't been ran long enough yet?

  3. #3
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    Quote Originally Posted by ChrisFuture8 View Post
    What year is your car, JDP530? The spark plugs I got in my car is the OEM recommended ones (the one with 1K OHM internal resistance). My plugs are similar in color too but not as white as yours on the half side. There's some brownish color to mine. Maybe yours hasn't been ran long enough yet?
    I have a '91 model. These are the low resistance NGK BKR6EK 1R plugs that many on here have recommended. I only have about four hours time on engine since I got it running.

  4. #4
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    That looks perfect for a two-valve head, it will go the same colour all around the insulator a few thousand miles later....
    Timm..2007 E64 650i Individual Sport..1999 E31 840ci Individual Sport..ex owner of 2000 E38 740..1999 E38 740i V8 M62..1998 E38 735i V8..1993 E32 730i V8..1988 E28 518i


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