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134f, Won't Rev Past 1500-2000rpm, Intermittent Miss,backfire?

Discussion in 'Early CJ-5 and CJ-6 Tech' started by 70cj5134f, Oct 10, 2018.

  1. Oct 12, 2018
    70cj5134f

    70cj5134f Member

    East Tn
    Joined:
    Aug 18, 2018
    Messages:
    351
    New points, already green, what causes this?
    Hadn't run over 5 min with these?
    15393616950812109902353.jpg 15393617415201318651981.jpg
     
  2. Oct 12, 2018
    70cj5134f

    70cj5134f Member

    East Tn
    Joined:
    Aug 18, 2018
    Messages:
    351
    All mechanics look good, no play in shaft, adv works,no wires shorted,
    What's UP???
    Something electrial ?
    Thanks
    PS- gotta get this fixed, Im itching to finish 3.7 teardown!
    Well itching ant the right word? More like an addiction?
     
  3. Oct 12, 2018
    55_Willys_CJ5

    55_Willys_CJ5 Nephews Visit 2017 Sponsor

    Southern California
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    Aug 4, 2015
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    242
    Read your post and did some searching on the web. It is possible that your new condenser is bad. Does your ignition system include a ballast resistor? If so, then you might want to check to see if it is bad. Like others have stated and if you haven't already done so, check all wire connections and connecting points to eliminate any loose/bad connections.
     
  4. Oct 12, 2018
    TonyM

    TonyM New Member

    Middle Tennessee
    Joined:
    Jul 30, 2017
    Messages:
    31
    if you should decide to dive further into the distributor itself, before you get a replacement/aftermarket unit you should consider getting yours rebuilt. Look for a local auto/truck electrical place and see if they do generators, alternators and distributors. OR, contact John at Midwest Military. He rebuilt mine for my CJ5 (and for my M38 when I had it). He's a great guy and will shoot straight with you.
     
  5. Oct 12, 2018
    PeteL

    PeteL Member Sponsor

    Hills of NH
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    Aug 3, 2003
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    5,827
    Not having the voltage reducing ballast resistor on the coil.

    Or possibly a bad condensor, although I've never experienced that in 50 years.
     
  6. Oct 12, 2018
    Keys5a

    Keys5a Sponsor Sponsor

    Joined:
    Jan 23, 2014
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    Bad condenser can burn up points in short order. Try to re-install your original, and file the burned points to clean them up. -Donny
     
  7. Oct 12, 2018
    Howard Eisenhauer

    Howard Eisenhauer Super Moderator Staff Member Sponsor

    Tantallon, Nova...
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    Nov 22, 2003
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    Stock coil has an internal ballast.
     
  8. Oct 12, 2018
    Glenn

    Glenn Kinda grumpy old man Staff Member Sponsor

    Apopka, Fl
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    Sep 21, 2002
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    And it should be marked as to whether or not an external resistor is required....at least they normally are anyway.
     
  9. Oct 13, 2018
    70cj5134f

    70cj5134f Member

    East Tn
    Joined:
    Aug 18, 2018
    Messages:
    351
    No resistor on this coil, it's a msd blaster coil, ment for magnetic trigger ign,
    Ran less than 5 min? That's why green.
    I got the dist all assembled, points set on .020,After filling, an reinstalled .
    I then hooked back up the msd, before I started it, points only act as a ground trigger,
    Not much current flowing through the points.
    It RUNS,it REVS, it's ok now.set timing bout 8-10 btdc, test drove,
    All is well!
    The original coil that went bad, had the internal resistor, the replacement
    I used had no resistor, that's where the green came from.
    Thanks all.
     
    Glenn likes this.
  10. Oct 14, 2018
    70cj5134f

    70cj5134f Member

    East Tn
    Joined:
    Aug 18, 2018
    Messages:
    351
    well ,SOB, went to crank it today, and guess WHAT?,it wont start again. misses and pops.
    ran it bout hour or so last night, started and stoped many times, all was well? drove over to lake, 10 mile round trip.all ok.
    this is just like before, ran fine one day all day long, let it set over night and no go?
    im about ready to throw it off a bridge?
    HELP?
    IDEAS?
    im bout ready to buy a distributor?
    ant sure that's the problem though?
    im looking at the key switch next?
    points green again?
    do I need a resister in the coil when running msd?, I don't think so?
    glad its my car and not a customers?
    AND tomorrow is MONDAY???
     
  11. Oct 14, 2018
    Jrobz23

    Jrobz23 Member

    Northern, WI
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    Oct 3, 2016
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    373
    Won’t idle or won’t run well under load?
     
  12. Oct 14, 2018
    Walt Couch

    Walt Couch sidehill Cordele, Ga. Sponsor

    cordele, Ga.
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    [​IMG]
    Shows you still need the ballast resistor.
     
    Focker likes this.
  13. Oct 15, 2018
    70cj5134f

    70cj5134f Member

    East Tn
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    Aug 18, 2018
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    351
    I'll get a ballast resistor tomorrow.
    I hope u r right?
    So all this trouble, cause my dumbass,has no resistor?LOL
    Still don't u understand why it runs well all day, then
    Won't start next day? This has hapened 3 times? Points must corrode over night?
     
  14. Oct 15, 2018
    Jrobz23

    Jrobz23 Member

    Northern, WI
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    Oct 3, 2016
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    Are you leaving the key in it but turned off?
     
  15. Oct 15, 2018
    ITLKSEZ

    ITLKSEZ Volvophilic

    Post Falls, ID
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    Aug 13, 2015
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    2,252
    There has been an epidemic of bad condensers right out of the box (and otherwise quickly failing) lately. If you have one out of a running vehicle you could swap in to test, I'd try it.
     
    1967 CJ5A likes this.
  16. Oct 15, 2018
    scoutpilot

    scoutpilot Sponsor Sponsor

    Asheboro, NC
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    Water in the gas will do this.
     
  17. Oct 15, 2018
    70cj5134f

    70cj5134f Member

    East Tn
    Joined:
    Aug 18, 2018
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    Ok it runs again, no tack but runs on the points, not the msd box.
    New internal resister coil, msd unhooked, just like stock!
    Parts store clerk,old racing bud from way back conformed that the msd, fired by points, still needs a resister!
    I'll try to hook msd and tack back up tomorrow, think tack was maby wired on wrong?
    I'll dig up instructions and rewire!
    Happy it's running again?
    Need this finished so I can get back to 3.7!
    Thanks all!
     
    Glenn, Walt Couch and Jrobz23 like this.
  18. Oct 17, 2018
    70cj5134f

    70cj5134f Member

    East Tn
    Joined:
    Aug 18, 2018
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    351
    Dug out the instructions that came with the electronic ign.
    With all the trouble I've had, wanted to confirm wiring correct?
    Wellllll, I might have found the problem.
    Their are 2 red wires on this harness, almost identical,and I had reversed them.
    1 straight to battery or positive side of solonoid, and 1 (the slightly smaller),
    To a switched 12v source .
    With them reversed, power was on the points with the key in off position,
    causing the points to glaze over during the time it was off,before I tried to
    start it the next day. It is now wired correct.
    Drove to store and back and couple hours on farm.
    Next time not so much brandy while wiring ? LOL
     
  19. Oct 17, 2018
    tcfeet

    tcfeet Member

    east of west,...
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    May 30, 2009
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    259
  20. Oct 18, 2018
    70cj5134f

    70cj5134f Member

    East Tn
    Joined:
    Aug 18, 2018
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    351
    Started and drove again today, believe it's done.
     
    Glenn and Jrobz23 like this.

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