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Low Rpm Knock/ping

Discussion in 'Early CJ5 and CJ6 Tech' started by erhuff, Jul 10, 2017.

  1. Jul 15, 2017
    erhuff

    erhuff Western MA

    Western MA
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    Ok sounds good. They were changed in 2012 and probably only have 1000 miles since then due to other projects i was working on.
     
  2. Jul 15, 2017
    PeteL

    PeteL If it wasn't for physics, and law enforcement... 2022 Sponsor 2021 Sponsor 2020 Sponsor

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    After seven years service, I would advise making sure the points are very clean - a light touch with very fine emery paper, then polished with clean white paper drawn through them. Then set the gap.

    Also lightly grease the distributor cam to reduce wear on the heel.

    Under the rotor, there may be a felt plug in the dist. shaft that gets a few drops of engine oil. While you are in there, you can see if the advance weights are free, and very lightly lubed.
     
  3. Jul 16, 2017
    sterlclan

    sterlclan Member 2022 Sponsor 2021 Sponsor

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    Ditch the points get pertronix and throw those champion plugs out and get some Delco plugs. Pertronix eliminates the need for adjusting and changing points, and champion plugs are for a lawn mower or Harley.
     
  4. Jul 16, 2017
    PeteL

    PeteL If it wasn't for physics, and law enforcement... 2022 Sponsor 2021 Sponsor 2020 Sponsor

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    Please educate me. Why would a sparkplug good enough for a Harley be inadequate for a Jeep?
     
  5. Jul 16, 2017
    erhuff

    erhuff Western MA

    Western MA
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    At some point I would like to run a DUI setup and we can argue the finer points of different ignition setups at a later date. My goal this summer is to enjoy the jeep by driving it as much as possible. I have been picking off little projects here and there on the jeep which ultimately kept it off the road/trails and in the garage.

    With that said, I too am curious on why Champion plugs are of lesser quality than AC Delco. I assumed that if I got the right heat range and specs, I was good.
     
  6. Jul 16, 2017
    colojeepguy

    colojeepguy Colorado Springs

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    I too have had problems with Champion plugs, on multiple occasiono.
    Won't use them, even in a lawn mower !
     
  7. Jul 16, 2017
    1960willyscj5

    1960willyscj5 Well-Known Member

    Mesa, Arizona
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    Personal preferences and experiences. I really don't remember what I am running in mine. Some people swear by those new E-3 plugs. Some people just swear.
     
    Jrobz23 and erhuff like this.
  8. Jul 16, 2017
    sterlclan

    sterlclan Member 2022 Sponsor 2021 Sponsor

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    the only two things ive ever seen that actually run on a champion...
     
  9. Jul 16, 2017
    erhuff

    erhuff Western MA

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    I was able to take the jeep for a quick drive today to see how the new timing was. (I didn't mess with the dwell or points yet)

    It seemed to run great, didn't bog, backfire or ping when going uphill at a low RPM. I did notice that the idle was around 900 when i stopped and the fenderwells were hot to the touch, which may be normal since it was 93 and I am just paranoid while searching for symptoms.
     
  10. Jul 16, 2017
    1960willyscj5

    1960willyscj5 Well-Known Member

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    One thing you should understand is that the timing changes when the dwell and/or point gap changes. Which is why we say to set the point gap/dwell and then set the timing. And 900 rpm idle is a good number. Some will say no on that. My Willys F134 is persnickety and just seems happier idling at 900 rather than 650 or 700 rpm.
     
  11. Jul 17, 2017
    Jrobz23

    Jrobz23 Member

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    On propane, my 57 will idle just above dying. With the solex, my 65 loves 900ish and idles very smooth. Really dislikes lower than that. My carters never seemed to run right.
     
  12. Jul 19, 2017
    erhuff

    erhuff Western MA

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    I got my dwell meter in the mail, so i was finally able to set everything. The dwell was 17-18 degrees, so 12-13 degrees off. When I adjusted that, it had the timing all wrong. I had this weird feeling that someone told me dwell has to be set before timing... :whistle: ;)

    Jokes aside, I got the timing set to 29.7 degrees (the meter had it floating between 29.5 and 29.7 degrees with most the time at 29.7). I figured that was close enough to 30 and my adjustments were not very microscopic, so I left it there. I then set the timing to 5-6 degrees advance. I also adjusted the idle slightly (before I did timing) and it is seems comfortable at 700 rpms. I can't believe tune-up specs have it at 550, but 900 seemed a little high.

    Setting the dwell eliminated that "jump" I was talking about when timing before.

    I didn't have a chance to take it for a spin, but will in the next few days. Thanks again everyone for the advice, help, and guidance!
     
  13. Jul 19, 2017
    PeteL

    PeteL If it wasn't for physics, and law enforcement... 2022 Sponsor 2021 Sponsor 2020 Sponsor

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