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Red Spark Plugs?

Discussion in 'Early CJ5 and CJ6 Tech' started by Randy Benedict, Sep 21, 2020.

  1. Sep 21, 2020
    Randy Benedict

    Randy Benedict Member

    Center, MO
    Joined:
    Jan 13, 2020
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    102
    I'm diagnosing a dauntless that runs rough. I pulled the plugs and found the electrodes on the ends are red on one head. Has anyone seen this before? Any thoughts? Does not loose water and no water in oil. Intake manifold gasket? 20200921_101312.jpg
     
  2. Sep 21, 2020
    Warloch

    Warloch Did you say Flattie??? Staff Member

    Falcon, CO
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    Mar 4, 2003
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    5,466
    Here is a good reference I've used for quite a while.

    [​IMG]
     
  3. Sep 21, 2020
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

    Medford Mass USA
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    Aug 10, 2003
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    Where do you see red? Looks ok to me.
     
  4. Sep 21, 2020
    Randy Benedict

    Randy Benedict Member

    Center, MO
    Joined:
    Jan 13, 2020
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    102
    The plugs on the one head are all normal looking. All 3 on the other side are orangeish red. Could the intake manifold gasket on the one side be leaking?
     
  5. Sep 21, 2020
    PeteL

    PeteL If it wasn't for physics, and law enforcement... 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Hills of NH
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    If it were, I think I'd expect to see a whiter plug nose, from a lean/hot condition.

    While yours show a relative difference, I'd say they are all acceptable. But if any concerned me more, it would be the lighter ones.
     
    Rick Whitson likes this.
  6. Sep 23, 2020
    Fireball

    Fireball Well-Known Member 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Pullman, WA
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    Feb 9, 2018
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    If it's an odd fire and the banks look different, it could be the wrong distributor, the right distributor with the wrong cap, or the right distributor being clocked wrong.

    Here's a thread about the correct distributor/cap: 225 rich on pass side bank, lean on drivers side.

    And here's a thread about clocking an odd-fire distributor properly: 225 rich on pass side bank, lean on drivers side.
     
  7. Sep 23, 2020
    Randy Benedict

    Randy Benedict Member

    Center, MO
    Joined:
    Jan 13, 2020
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    102
    I found the problem! The screws on one of the butterflies in the throttle body had came loose and was causing the gap to open too much. Venturie was allowed to draw excess gas through the secondary on one side of the manifold. I found that the gap was supposed to be 0,020. I set the gap on both butterflies and used loctite on the threads. Reinstalled the carb and now it runs great! New one for me! Thanks for e everyone's comments and help.
     
    Fireball likes this.
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