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Thread: Spark plug help

  1. #1

    Default Spark plug help

    I have here a picture of one spark plug I pulled out. This is the worst one out of the bunch but they are all generally in the same condition. A little oily around the threads and a little carbon built up. The electrodes are still present ... Is this normal for a motor with 800hrs? Or is this indicative of a more serious issue (I:E top end needing rebuild or needing valve job)? And what spark plugs are you guys running? Boat stays between 2000 feet to 6000 feet (if it matters)

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  2. #2
    Join Date
    Jul 2007
    Location
    Flowery Branch Georgia
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    2,680

    Default

    What year and engine do you have?

  3. #3

    Default

    To be safe, check your compression on all cylinders.

  4. #4
    Join Date
    Jun 2012
    Location
    Knoxville TN
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    1,332

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    Call SKIDIM with your year and motor size. I think I noticed this yesterday on Facebook, 454 correct?
    2018 Supra SL400

  5. #5
    Join Date
    Apr 2009
    Location
    SE MICHIGAN
    Posts
    77

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    run a r45ts ac delco or if you want to spend more money mr45ts
    are you running points any coil up grade ?
    buy the looks getting the right plugs will clear up your carbon issue
    1986 TSM6
    1987 SALTERA

  6. #6

    Default

    Quote Originally Posted by michael hunter View Post
    What year and engine do you have?
    1990 454 pcm

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  7. #7

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    Quote Originally Posted by angus2112 View Post
    run a r45ts ac delco or if you want to spend more money mr45ts
    are you running points any coil up grade ?
    buy the looks getting the right plugs will clear up your carbon issue
    Yes msd ignition, blaster ect.

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  8. #8

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    Quote Originally Posted by MJHKnox View Post
    Call SKIDIM with your year and motor size. I think I noticed this yesterday on Facebook, 454 correct?
    Yes on the supra page.

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  9. #9
    Join Date
    Jul 2007
    Location
    Flowery Branch Georgia
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    2,680

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    Not a fan of MSD ignition definitely not a fan of the butt connectors on the red and black wires. The correct plug is a AC MR43T. The MR45T will run a little hotter.
    Last edited by michael hunter; 04-01-2020 at 08:01 AM.

  10. #10

    Default

    Quote Originally Posted by michael hunter View Post
    Not a fan of MSD ignition definitely not a fan of the butt connectors on the red and black wires. The correct plug is a AC MR43T. The MR45T will run a little hotter.
    I agree , previous owner installed MSD. And did the connectors. I'm contemplating buying a new motor or even crate motor or trying figure out pricing for a new rebuild. (Change to roller cams and new top end) but want to ensure the pistons and bottom end are good before I do all that.

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