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Vacuum Hoses F134

Discussion in 'Early CJ-5 and CJ-6 Tech' started by ojgrsoi, Jan 11, 2019.

  1. Jan 11, 2019
    ojgrsoi

    ojgrsoi Retired. Sponsor

    Weatherford, TX
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    I hadn't driven my JEEP in about two weeks. It started normal and I let it run a couple of minutes before I left. I headed out and then I got this coughing and bucking which decreased power. Brought it back home and it idles fine. Raised the hood and saw this vacuum line laying behind the distributor.

    [​IMG]

    The way this backfired through the carburetor it made me zero in on replacing the vacuum line. Problem is that I see no ports from which it could have come. Here are photos around the carburetor.

    [​IMG]
    [​IMG]
    [​IMG]
    [​IMG]
    [​IMG]

    I've looked in the FSM and don't see where this line could have been. Any thoughts?
    Points, condenser and rotor are fairly new.
     
  2. Jan 11, 2019
    PeteL

    PeteL Member Sponsor

    Hills of NH
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    I can't make out what the vacuum line under the throttle linkage is. Is that part of the situation?

    Do you have a vacuum advance type distributor?
     
  3. Jan 11, 2019
    ojgrsoi

    ojgrsoi Retired. Sponsor

    Weatherford, TX
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    there was no line there when I bought the JEEP. I think that is where the vacuum connects for the heater. The heater is not connected. I put that line on there a couple of years ago.

    How do I determine if the dist is vacuum advance type? It is bone stock AFAIK.
     
  4. Jan 11, 2019
    PeteL

    PeteL Member Sponsor

    Hills of NH
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    It would have a small clamshell canister on the side, with a vacuum hose fitting. But honestly I have no idea if they were ever fitted in your year jeep.
     
    Last edited: Jan 11, 2019
  5. Jan 11, 2019
    ojgrsoi

    ojgrsoi Retired. Sponsor

    Weatherford, TX
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    I see that vacuum advance on the v-6 distributors. The one on mine doesn't appear to have the vacuum assembly.
     
  6. Jan 12, 2019
    ITLKSEZ

    ITLKSEZ Volvophilic

    Post Falls, ID
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    This quote makes me think that hose is an unrelated distraction. A vacuum leak that bad would probably have the opposite effect: poor idle, but runs ok at speed. I'd start swapping electrical components, starting with the condenser and points.
     
  7. Jan 12, 2019
    scoutpilot

    scoutpilot Sponsor Sponsor

    Asheboro, NC
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    Any break in a motor's vacuum system is a leak. I suspect water in the old gas.
     
  8. Jan 12, 2019
    ojgrsoi

    ojgrsoi Retired. Sponsor

    Weatherford, TX
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    I'll check stuff and post more later. It's kinda cold..in the 40's so I may wait a few days.
     
  9. Jan 12, 2019
    PeteL

    PeteL Member Sponsor

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    You gotta be kidding - that is top-down/T-shirt weather. 3ºF here right now.
     
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  10. Jan 12, 2019
    70cj5134f

    70cj5134f Member

    East Tn
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    Might be time to clean carb, going lean somewhere, or try filling and gaping points?
     
  11. Jan 15, 2019
    ojgrsoi

    ojgrsoi Retired. Sponsor

    Weatherford, TX
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    It finally quit and would not start. This post and several others with condenser failures made me swap to the old condenser first. While the cap was off I looked at the points, rotor and cap (all new and perfect). The condenser was the culprit. Swapped to the old condenser and it fired right up and runs perfect.
    The part that failed was a new part installed late last summer and maybe has 100? or so miles on it. :mad:
    I bought the Heavy Duty Airtex from Rock Auto because the description said heavy duty and was only slightly higher. The website indicated it was the one most frequently purchased for this application. Oh well at least I'm back on the road.
    Thanks.

    [​IMG]

    BTW
    I still don't know where that hose goes or where it came from. It wasn't there when I completed the tune up last summer.:shrug:
     
    Last edited: Jan 17, 2019 at 8:33 AM
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  12. Jan 15, 2019
    baldjosh

    baldjosh Sponsor Sponsor

    pacific north west
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    F-rock auto
    how was the hose oriented under/behind the dizzy...im glad you got her running but am curious about the hose...more of a WTF than anything
     
  13. Jan 15, 2019
    ojgrsoi

    ojgrsoi Retired. Sponsor

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    I'm going to go thru my old fotos to see if I see it somewhere. When I found it it was laying slightly behind the cap. :shrug:
     
  14. Jan 15, 2019
    ITLKSEZ

    ITLKSEZ Volvophilic

    Post Falls, ID
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    :clap: Glad you fixed it!
     
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  15. Jan 16, 2019 at 11:30 PM
    1960willyscj5

    1960willyscj5 Well-Known Member

    Mesa, Arizona
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    That a pickup or wagon engine? I don't believe any of the CJ's came with a breather in the top valve cover. The PCV was mounted on the drivers side cover for the exhaust valves.
     
  16. Jan 17, 2019 at 2:02 AM
    Greevesman

    Greevesman Sponsor Sponsor

    Napa, Ca
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    My 65 has a vacuum line to the heater control. I will look tomorrow and see where it connects.
     
  17. Jan 17, 2019 at 6:35 AM
    Rick Whitson

    Rick Whitson Detroit Area Sponsor

    I live South of...
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    That little line that is under the carb goes the heater control on my 64 134 F head. My carb base does not have a port on it, the picture I am sending the heater vac line is plugged.[​IMG]
     
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  18. Jan 17, 2019 at 5:09 PM
    Greevesman

    Greevesman Sponsor Sponsor

    Napa, Ca
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    Mine also runs from the PCV valve below the carburetor thru a runner grommet in the firewall to the heater control.
    Maybe a backfire could pop it off? IMG_20190117_111100948.jpg
     
  19. Jan 17, 2019 at 6:14 PM
    ojgrsoi

    ojgrsoi Retired. Sponsor

    Weatherford, TX
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    Yes that's where it came from. It appears from old photos that that vacuum line came from the same location as you show. It must have been there all along from when I removed it. I just routed a line from the empty port at the base of the carburetor to where the heater control came off and pulled the remainder of the line out of the firewall. My heater is disconnected.

    Thanks.
     

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