1. Registration trouble? Please use the "Contact Us" link at the bottom right corner of the page and your issue will be resolved.
    Dismiss Notice

Fouled Plug Cause

Discussion in 'Early CJ5 and CJ6 Tech' started by DirtRoad61, May 7, 2020.

Page 2 of 2
  1. May 8, 2020
    Glenn

    Glenn Kinda grumpy old man Staff Member

    Apopka, Fl
    Joined:
    Sep 21, 2002
    Messages:
    12,376
    What is the reason for turning it down? Hard starting, bad idle, overheating, not running good?
     
    Glenn, May 8, 2020
    #21
  2. May 8, 2020
    DirtRoad61

    DirtRoad61 Member

    California
    Joined:
    Jun 9, 2019
    Messages:
    51
    Started and idled good. Loses power and backfires after a few minutes of 3/4 throttle. Got better with less timing but still does it. Cant drive long over 45 mph.
     
    DirtRoad61, May 8, 2020
    #22
  3. May 8, 2020
    ITLKSEZ

    ITLKSEZ Hope for the best, prepare for the worst

    Spokane Valley, WA
    Joined:
    Aug 13, 2015
    Messages:
    6,683
    This sounds like a lean-running issue. Main jet clogged in the carb?
     
    ITLKSEZ, May 8, 2020
    #23
    tcfeet likes this.
  4. May 8, 2020
    Glenn

    Glenn Kinda grumpy old man Staff Member

    Apopka, Fl
    Joined:
    Sep 21, 2002
    Messages:
    12,376
    Can't help but think that you unknowingly retarded the timing quite a bit. Does the crankshaft pulley have any notches in it? On the timing gear cover side?
     
    Glenn, May 8, 2020
    #24
  5. May 8, 2020
    DirtRoad61

    DirtRoad61 Member

    California
    Joined:
    Jun 9, 2019
    Messages:
    51
    Electronic distributor. Was originally advanced as far as it could go. Slowly turned it down while driving till I had better results.

    I there is a scratch on the pulley and on the timing cover. But zero reference to degrees.
    Most likely put there by PO.
     
    DirtRoad61, May 8, 2020
    #25
  6. May 8, 2020
    FinoCJ

    FinoCJ 1970 CJ5 Staff Member

    Bozeman, MT
    Joined:
    Jul 18, 2013
    Messages:
    5,650
    I'd manually move the engine to TDC on #1 and see if the scratches line up....or make your own if needed to mark TDC....Then you will at least know if timing is zero, advanced or retarded.You could probably run it just ever so slightly advanced (not that familiar with F134) or could even tune the idle using a vac gauge and moving into the advanced zone just a bit.
     
    FinoCJ, May 8, 2020
    #26
  7. May 9, 2020
    PeteL

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

    Hills of NH
    Joined:
    Aug 3, 2003
    Messages:
    9,822
    If electronic distributors do that to sparkplugs, I'll stick with my points, thank you very much.

    More seriously, haven't I seen here that pertronics etc, require resistor wires? What type are your plug wires?
     
    PeteL, May 9, 2020
    #27
  8. May 9, 2020
    DirtRoad61

    DirtRoad61 Member

    California
    Joined:
    Jun 9, 2019
    Messages:
    51
    Petronix wires. Not a petronix points replacement for distributor. It's a full electronic one.
     
    DirtRoad61, May 9, 2020
    #28
  9. May 9, 2020
    PeteL

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

    Hills of NH
    Joined:
    Aug 3, 2003
    Messages:
    9,822
    Okay. I know nothing about that stuff. Except the couple of OEM units that have failed erratically in my trucks and drove me out of my mind trying to diagnose
     
    PeteL, May 9, 2020
    #29
  10. May 9, 2020
    Keys5a

    Keys5a Sponsor

    Florida Keys
    Joined:
    Jan 23, 2014
    Messages:
    4,190
    That #2 photo with the electrode burned back is pretty telling. If the issue was caused by the timing being too far advanced, or the carb too lean, this would happen to more than one cylinder. I would check for a vacuum leak or something else that is making that cylinder run lean, or otherwise too hot.
    -Donny
     
    Keys5a, May 9, 2020
    #30
Page 2 of 2
New Posts