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F134 Fast Idle With Choke

Discussion in 'Early CJ5 and CJ6 Tech' started by kenb, Jan 16, 2020 at 11:54 AM.

  1. Jan 16, 2020 at 11:54 AM
    kenb

    kenb Member

    Detroit
    Joined:
    Jan 22, 2019
    Messages:
    176
    Hello,

    I'm running a F134 with a Carter YF 938 SD. I know the carb isn't original to this particular engine but I think it's a correct type.
    When I apply choke for starting it raises the idle as it should. However, I think it's too much. It will spike over 1500 RPM. My understanding is that there is a pushrod to bend to adjust this setting. What's an appropriate RPM to adjust to?
    Thanks,
    Ken
     
  2. Jan 16, 2020 at 12:48 PM
    65CJ5 SRD

    65CJ5 SRD Member

    NM
    Joined:
    Aug 12, 2019
    Messages:
    101
    On mine there's 2 screw adjustments; one for idle, one for fast idle. If yours only has 1 screw adjust then it may adjust with a rod, or maybe the 2nd screw adjuster is missing?
     
  3. Jan 16, 2020 at 2:40 PM
    Jw60

    Jw60 Recovering Jeepaholic

    Sedalia MO.
    Joined:
    Oct 5, 2018
    Messages:
    388
    I might try 1200rpm but adjust when cold not hot
     
  4. Jan 16, 2020 at 4:23 PM
    tcfeet

    tcfeet Member

    east of west,...
    Joined:
    May 30, 2009
    Messages:
    296
    I think the "idle" linkage should be adjusted when the choke is open. The linkage rod should slip out of the bottom hole without
    any effort. {loose in the hole}. I just rebuilt mine and had the high idle after driving and coming to stop. The linkage adjustment
    fixed the problem..
     
    Rick Whitson likes this.
  5. Jan 17, 2020 at 6:41 AM
    Rick Whitson

    Rick Whitson Detroit Area 2020 Sponsor 2019 Sponsor

    I live South of...
    Joined:
    Dec 2, 2014
    Messages:
    1,086
    Ken, there is a linkage that goes from the choke plate to the throttle linkage, that has a 90* kink in it, you can bend it open for higher or close it for lower speed idle when using the choke. I seldom need to use my choke, don't want to foul the plugs, just pump it a few times and fire it up, works good for my F 134. Good Luck
     
  6. Jan 17, 2020 at 7:00 PM
    kenb

    kenb Member

    Detroit
    Joined:
    Jan 22, 2019
    Messages:
    176
    Thanks for the replies. I think I have a leak in the accelerator pump so I'm going to pull the carb and rebuild it. That should give me an opportunity to figure out exactly how my linkage is set up.
     

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