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Thread: #2 & #3 spark plugs white #1 & #4 black soot

  1. #1
    Join Date
    Jan 2007
    Location
    Pawling, NY
    Posts
    192

    Default #2 & #3 spark plugs white #1 & #4 black soot

    Changing spark plugs noticed two were white two weresooty could valves need adjustment? Thanks all!

  2. #2
    Join Date
    Feb 2007
    Location
    East Granby, CT
    Posts
    1,884

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    Were all the plugs the same (heat range, etc.)?
    Post close-up pics if you can.

    Black sooty could be too rich or too cold of a plug. White could be too lean or too hot of a plug. Both at once = ??

    Google how to read spark plugs and you will get to see lots of pictures of different plug conditions.

  3. #3
    Join Date
    Jan 2007
    Location
    Pawling, NY
    Posts
    192

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    Yes all four plugs are the same heat range. Yeah having both two different readings are weird. I'm m wondering if I have an air bubble in the engine that would make 2 & 3 white. Or if tappets are off. Curious. I' ll post picks asap. Thanks

  4. #4
    Join Date
    Apr 2010
    Location
    Shoreline, WA
    Posts
    408

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    Are you sure about which cylinders are which? typically the center two (2&3) would be richer (darker) than the outside two (1&4) because of the differing lengths of the intake runners. Since the carb sits in the center the center two get a slightly richer mixture than the outer two. (normally not as significant as you're describing though), possibly two of the wires having intermittent misfire or low voltage? Just speculating.
    Gale Breitkreutz
    '03 Disco
    '74 Series III 88 (sold, 4/13)
    '47 CJ2A

  5. #5
    Join Date
    Jan 2007
    Location
    Pawling, NY
    Posts
    192

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    Yes it was 2 & 3. Funny thing is she was driving really well with no signs of hesitation or backfiring.

  6. #6

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    Unusual. Could be a vacuum leak on 2 & 3? Weak spark on 1 & 4? Compression differences?

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