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Developing a 'stumble' at midrange RPM...

Discussion in 'Early CJ5 and CJ6 Tech' started by 1964_cj5, Jul 25, 2006.

  1. Jul 25, 2006
    1964_cj5

    1964_cj5 I'd rather be Jeepin'

    Aiken, South...
    Joined:
    Jul 13, 2006
    Messages:
    88
    Well, I finally got the Jeep to pur like a kitten at idle. It was missing very badly and turned out the points were out of adjustment and the timing was way off. But now the Jeep wants to hesitate and stumble at partial throttle or if i get off the gas and back on again. And sometimes it does it from a standstill, too. Where should I begin to troubleshoot? Plugs looked good when we pulled them last weekend. So what do you think it could be? :? Can't wait to get this bad boy running smoothly again. Seems to pull so much better after the last adjustments. It used to fall on its face going uphill in 3rd, but now it keeps pulling with no problems, other than the hesitation now. Grrrr! lol! R)
     
    1964_cj5, Jul 25, 2006
    #1
  2. Jul 25, 2006
    sagegoat

    sagegoat The good life........

    Vernal,Utah
    Joined:
    Mar 4, 2006
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    251
    Great job.:) Sounds like carb adjustments the rest of thr way.:beer:
     
    sagegoat, Jul 25, 2006
    #2
  3. Jul 25, 2006
    1964_cj5

    1964_cj5 I'd rather be Jeepin'

    Aiken, South...
    Joined:
    Jul 13, 2006
    Messages:
    88
    What should I adjust on it? I thought I had it adjusted properly because it ran fine the day of and the day after the other adjustments I mentioned. It just started doing the stumbling today, so I'm not sure what's up.

    Oh yeah, forgot to mention that I have the f134 with the Carter YF carb.
     
    1964_cj5, Jul 25, 2006
    #3
  4. Jul 25, 2006
    sagegoat

    sagegoat The good life........

    Vernal,Utah
    Joined:
    Mar 4, 2006
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    251
    Coil,wires,plugs. I learned a lesson on not checking the simple things.
     
    sagegoat, Jul 25, 2006
    #4
  5. Jul 25, 2006
    1964_cj5

    1964_cj5 I'd rather be Jeepin'

    Aiken, South...
    Joined:
    Jul 13, 2006
    Messages:
    88
    Ok I see. Yeah I guess I need to pull the plugs and see how they look now. Sunday they were brownish white on the electrode and more black around the threads. The wires 'look' good, but I guess I could change them out to make sure. Would running 89 octane in the Jeep when it's used to 93 make a difference? My dad always ran 93 in it for some reason.
     
    1964_cj5, Jul 25, 2006
    #5
  6. Jul 25, 2006
    Mcruff

    Mcruff Earlycj5 Machinist

    Albertville, AL
    Joined:
    Sep 22, 2002
    Messages:
    5,349
    It doesn't need anything more than 87 really.
     
    Mcruff, Jul 25, 2006
    #6
  7. Jul 26, 2006
    lynn

    lynn Time machine / Early CJ5 HR Rep Staff Member

    Huntingdon PA
    Joined:
    Sep 20, 2002
    Messages:
    3,437
    Many guys have noticed considerable improvements in performance as well as elimination of hesitation/stumbling by installing a Pertronix Ignitor kit, replacing the points. Do a search on this forum, LOTS of info here...

    HTH!
     
    lynn, Jul 26, 2006
    #7
  8. Jul 26, 2006
    1964_cj5

    1964_cj5 I'd rather be Jeepin'

    Aiken, South...
    Joined:
    Jul 13, 2006
    Messages:
    88
    Yeah I have thought about installing a Pertronix, but there are a couple other areas of the Jeep that need my immediate attention...namely the super sloppy steering and my leaky MC! :shock: I think I will check the fuel filter and plug gap when I get home to rule out any easy fixes.
     
    1964_cj5, Jul 26, 2006
    #8
  9. Jul 26, 2006
    66cj5

    66cj5 Jeep with no name

    NorthWest Indiana
    Joined:
    Sep 10, 2003
    Messages:
    2,084
    sounds like the dwell is off as well.
     
    66cj5, Jul 26, 2006
    #9
  10. Jul 26, 2006
    1964_cj5

    1964_cj5 I'd rather be Jeepin'

    Aiken, South...
    Joined:
    Jul 13, 2006
    Messages:
    88
    What is this 'dwell' you guys speak of? lol! I know, I know, I need to get an FSM. But when I checked the point gap, I just used a feeler gauge. How do I go about checking the dwell?
     
    1964_cj5, Jul 26, 2006
    #10
  11. Jul 26, 2006
    sparky

    sparky Sandgroper Staff Member Founder

    Perth, WA
    Joined:
    Sep 20, 2002
    Messages:
    9,221
    Not being a smart *** but a dwell meter.

    Instructions for use come with 'em. Usually they're a tach/volt/dwell meter combo.
     
    sparky, Jul 26, 2006
    #11
  12. Jul 26, 2006
    1964_cj5

    1964_cj5 I'd rather be Jeepin'

    Aiken, South...
    Joined:
    Jul 13, 2006
    Messages:
    88
    LOL! Thanks sparky. Yeah I was asking some of the guys here in the motorpool about it and they said to bring it in and they would check it out for me.
     
    1964_cj5, Jul 26, 2006
    #12
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