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Carb Needed Random Adjustment

Discussion in 'Early CJ-5 and CJ-6 Tech' started by aekdbbop, Jul 11, 2018.

  1. Jul 11, 2018
    aekdbbop

    aekdbbop Member

    TN
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    Jul 31, 2014
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    369
    Was driving home the other day. Driving at normal speed with no problems. Got to the stop sign right before my house.

    Jeep was barely idling. Had to feather it to keep it from dying.

    Pulled into the garage.. gave it a look over. couldn't see anything obvious that was wrong.

    Adjusted the idle screw on the carb 3/4 of a turn or so, and its running fine now.

    What on earth could cause me to need this adjustment out of the blue?
     
  2. Jul 11, 2018
    Jrobz23

    Jrobz23 Member

    Northern, WI
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    You get some gunk in it somehow?

    Loose choke?
     
  3. Jul 11, 2018
    PeteL

    PeteL Member Sponsor

    Hills of NH
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    Crud or more especially water and corrosion products from ethanol fuel.

    I use a little SeaFoam on a regular basis and it helps.
     
  4. Jul 11, 2018
    Beach66Bum

    Beach66Bum Member Sponsor

    Big Island on...
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    Sticky throttle return maybe??
    Or the return spring tension has weakened.
    I had to adjust my idle screw too.
     
  5. Jul 11, 2018
    aekdbbop

    aekdbbop Member

    TN
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    It’s not the return. Messed with the carb tonight and I couldn’t get it idle well under 1200rpm. :/
     
  6. Jul 12, 2018
    Beach66Bum

    Beach66Bum Member Sponsor

    Big Island on...
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    Try taking the idle mixture screws completely out and then reinstall. It that doesn’t correct the issue, take the top cover off the carb and look to see if there’s sediment in the bottom.
     
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  7. Jul 12, 2018
    Jrobz23

    Jrobz23 Member

    Northern, WI
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    Are you spitting fuel out of the exhaust when you try to idle at normal RPM? If so, you prolly gunked up the air side of things and it's gasping for air. Prolly wanna clean things up in there. If you're not spitting gas, and it's falling on it's face, yeah something is messed up with the idle mixer or choke or something fuel side.
     
  8. Jul 13, 2018
    NCRenII

    NCRenII yellow fever

    Far Nor Cal
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    Sep 22, 2017
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    Also could be a vacuum leak. Check all hoses for tightness and make sure mounting bolts are sung to intake (not super tight).
     
  9. Jul 13, 2018
    scoutpilot

    scoutpilot Sponsor Sponsor

    Asheboro, NC
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    Does it need choke to idle?
     
  10. Jul 13, 2018
    garage gnome

    garage gnome Rust polisher Sponsor

    Western MA
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    Did the timing change at all?
     
  11. Jul 13, 2018
    Focker

    Focker Ran when parked... Runs while moving. Staff Member Sponsor

    Tri-Cities WA
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    How old is the gas?
    How long had the Jeep been sitting?
    How far did you drive that day?
     
  12. Jul 13, 2018
    aekdbbop

    aekdbbop Member

    TN
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    Timing didn't change.
    New gas, hadn’t been sitting more then a couple days. 10-20 miles
     
  13. Jul 13, 2018
    Focker

    Focker Ran when parked... Runs while moving. Staff Member Sponsor

    Tri-Cities WA
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    Do you have a vacuum gauge?
     
  14. Jul 13, 2018
    aekdbbop

    aekdbbop Member

    TN
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    Yeah. I was getting maybe 15-16 at a high idle
     
  15. Jul 13, 2018
    scoutpilot

    scoutpilot Sponsor Sponsor

    Asheboro, NC
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    Start checking for a vacuum leak. Especially s you are unsure as to when the last throttle overhaul was.
     
  16. Jul 13, 2018
    aekdbbop

    aekdbbop Member

    TN
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    Hey Rick, I've been emailing you about this for the last couple days. The carb came from you in October of 2016.
     
  17. Jul 13, 2018
    Glenn

    Glenn Kinda grumpy old man Staff Member Sponsor

    Apopka, Fl
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    Have you checked the carb mounting for tightness?
     
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  18. Jul 13, 2018
    aekdbbop

    aekdbbop Member

    TN
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    yeah it's tight.
     
  19. Jul 13, 2018
    1960willyscj5

    1960willyscj5 Well-Known Member

    Mesa, Arizona
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    what were the weather conditions?
    Entirely possible that you had a carburator icing condition.
     
  20. Jul 13, 2018
    aekdbbop

    aekdbbop Member

    TN
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    Warm night. But it’s been sitting now a few days and still doing it
     

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