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poor spark?

Discussion in 'Early CJ5 and CJ6 Tech' started by spirit wolf, Oct 27, 2007.

  1. spirit wolf

    spirit wolf New Member

    working on my '59 f head. i have a new coil, cap and rotor, points, plugs, wires. i'm not gettin much or any spark to the plugs and it will not start. it had ran fine a few weeks ago and all of sudden it started missfiring. i replaced all these parts and now it won't start at all. its getting fuel and the plugs come out with a black carbon on the ends. anyone got any suggestions? theories greatly appreciated:beer:
     
    spirit wolf, Oct 27, 2007
    #1
  2. blevisay

    blevisay Oh Noooooooooooooooo! Staff Member

    Time for New plugs......
     
    blevisay, Oct 27, 2007
    #2
  3. spirit wolf

    spirit wolf New Member

    they are new
     
    spirit wolf, Oct 27, 2007
    #3
  4. blevisay

    blevisay Oh Noooooooooooooooo! Staff Member

    Did you put new plugs in and have it not start and clean them at anypoint?
     
    blevisay, Oct 27, 2007
    #4
  5. spirit wolf

    spirit wolf New Member

    yes
     
    spirit wolf, Oct 27, 2007
    #5
  6. blevisay

    blevisay Oh Noooooooooooooooo! Staff Member

    I would try a new set..........BTDT.

    What does the spark look like?
     
    blevisay, Oct 27, 2007
    #6
  7. spirit wolf

    spirit wolf New Member

    seems weak to me.
     
    spirit wolf, Oct 27, 2007
    #7
  8. blevisay

    blevisay Oh Noooooooooooooooo! Staff Member

    when did it start misfiring?
    It really does sound like fouled plugs. The j8c's are known for being easily fouled. You didn't leave the choke on too long did you?
     
    blevisay, Oct 27, 2007
    #8
  9. dave74

    dave74 Sponsor

    I had an engine that had a pale blue sometimes yellow spark that was a bad ground inside the distributor from points to housing. Repaired ground and strong blue spark. Just another thing to check.
     
    dave74, Oct 27, 2007
    #9
  10. jeepdaddy2000

    jeepdaddy2000 Active Member

    My money is on the points. Dwell set? might take a small file to the contacts and insure they are aligned with each other. Also insure the coil is wired with the pos side to the ign.
     
    jeepdaddy2000, Oct 28, 2007
    #10
  11. sammy

    sammy Coca-Cola?

    I'm with points... Maybe even your gap. Did you check gap? I didn't see mention of them.
     
    sammy, Oct 28, 2007
    #11
  12. Walt Couch

    Walt Couch sidehill Cordele, Ga. 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Your original problem on missfire could have been water in fuel? If so I bet it still there?
     
    Walt Couch, Oct 28, 2007
    #12
  13. mrhp

    mrhp Member

    I do not see that you replaced the condensor. If the condensor is shorted, or shorting out, you will have a weak spark symptom. I would also check the wires under the cap that go to the points as the insulation is brittle and could have fallen off when you replaced the points causing it to short out on the breaker plate. Just a few things to check!:beer:
     
    mrhp, Oct 28, 2007
    #13
  14. Walt Couch

    Walt Couch sidehill Cordele, Ga. 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Are you getting a full 12+ volts to the pos side of the coil? You should read this in the crank mode.
     
    Walt Couch, Oct 29, 2007
    #14