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Cold Start Issues

Discussion in 'Early CJ5 and CJ6 Tech' started by mayday, May 5, 2016.

  1. May 5, 2016
    mayday

    mayday Sponsor

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    Hello all, I have an issue with my 57 cj5. In mornings doesn't want to start with out a little starting fluild doesn't maker choke on or off. after it starts runs great and will restart fine all day long. started after I replaced carb with YF from Solex, float is set right metering and jets are all good. fuel pump was just rebuild also but issue was there before. I have swapped low speed idle jet and accelerator pump still no help. choke system is set per manufacture. jeep runs great has plenty of power. Jeep is all stock still 6 volt. fuel system has been rebuilt or replaced. parts I used were a mix of two rebuilds to match specs of factory parts. Thanks in advance.
     
  2. May 5, 2016
    Dave B

    Dave B Frankenjeep '67

    Northern Minnesota
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    I would start by questioning why the choke doesn't do the job of start-up. :susp:

    If it's an "automatic" vs manual choke -- choke it "manually" and it should start or flood/drown out.

    Free
    advice from a non-mechanic--comes without fire extinguisher or burn/first-aid kit!
     
  3. May 5, 2016
    Howard Eisenhauer

    Howard Eisenhauer Administrator Staff Member

    Tantallon, Nova...
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    Are you sure theres fuel in the bowl ?

    H.
     
  4. May 5, 2016
    mayday

    mayday Sponsor

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    manual choke, choke works once jeep starts it will work, or later on restart choke works. i've been playing around with it for a week, starting to run out of idea's. it seems like I can't get fuel in it. I pressure peddle 4 times, sounds like it wants to start and nothing tell she gets a shot of go juice.
     
  5. May 5, 2016
    mayday

    mayday Sponsor

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    I've looked in bowl there's fuel in it. I've thought about accel pump but ive swapped it out and tried two different ones. I'm at a loss.
     
  6. May 5, 2016
    PierreDnepr

    PierreDnepr Member

    Barrie Ontario
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    Sep 4, 2013
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    Hi,

    The Solex "choke" is an enricher it does not actuate a choke plate in the throat. I have the same carb and in the morning it starts but pop in the carb and runs rough until warmed up. Once its warmed up its fine all day like you said. I'm guessing that it does not atomized its fuel very well and its likely pooling gas in the manifold until they become warm however I'm just a newbee so I may out to lunch.

    This is "my" standard starting procedure for my solex when cold:

    1) Pull the choke - don't touch the gas
    2) ignition on - NO gas - try to start

    A) If its start let it idle till it start running rough (won't take long) then drop the choke lever to 1/4 to 1/2 and let it warm up

    B) If it doesn't start pump the accelerator pedal once or twice and try to start it again - normally it does
    you can give gas at that point but be gentle and feather the pedal.
    Once it idle... let it run till it run rough (won't take long) then drop the choke lever to 1/4 to 1/2 and let it warm up

    I may be worth mentioning that I likely have a valve or valve seat issue on one of my cylinder - Pressure is good but the vacuum gauge oscillate at idle so that may be one of my issue or contributing to it.

    Hope this help
     
  7. May 5, 2016
    mayday

    mayday Sponsor

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    the old solex would start fine when cold hard starting when warm. currently have a YF on fhead. really like the YF would rather not go back to solex.
     
  8. May 5, 2016
    Dave B

    Dave B Frankenjeep '67

    Northern Minnesota
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    Well, I've already stated my non-mechanic disclaimer--so here goes--you need (at least) two things: delivered fuel and spark to "fire-up". You must learn if your spark plugs are dry or get wet with gas when cranking for a cold start -- if wet, fuel is being delivered. Then question spark and its intensity.
     
  9. May 5, 2016
    PeteL

    PeteL If it wasn't for physics, and law enforcement... 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Hills of NH
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    Is the choke cable adjusted so it actually pulls the choke flap completely closed? (Looked down the carb throat to check?)
     
  10. May 6, 2016
    1960willyscj5

    1960willyscj5 Well-Known Member

    Mesa, Arizona
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    You do know that the Solex doesn't use a choke, right?
     
  11. May 6, 2016
    Howard Eisenhauer

    Howard Eisenhauer Administrator Staff Member

    Tantallon, Nova...
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    I'm reading it as he replaced the Solex with a Franken YF.

    H.
     
  12. May 6, 2016
    PeteL

    PeteL If it wasn't for physics, and law enforcement... 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Hills of NH
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    That's how I see it.
    And yes, the solex has an enrichener circuit in lieu of a choke, as was mentioned already by Pierre.
     
  13. May 6, 2016
    Glenn

    Glenn Kinda grumpy old man Staff Member

    Apopka, Fl
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    Is the choke linkage adjusted so it also pulls the accelerator linkage open too? You shouldn't really need to touch the accelerator pedal to start it.
     
  14. May 6, 2016
    1957Willys

    1957Willys Member

    Birmingham, Alabama
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    That's what was wrong with my 938SD it had parts out of a Carter YF 938SA. The metering rod was to short, base plate needed bushings, and the jets were wrong.
     
  15. May 6, 2016
    mayday

    mayday Sponsor

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    thanks to all for inputs, I didn't get much time to look at it last night. I did a little this morning got it running without using any "go" juice. had to pump the pedal about 8 times to get it to run. Then it ran fine. my Yf isn't to franken parts came from to rebuilds to match up the most stock settings. I'm going to check the choke adjustment tonight.
     
  16. May 6, 2016
    ITLKSEZ

    ITLKSEZ Hope for the best, prepare for the worst

    Liberty Lake, WA
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    It sure sounds to me like the carb bowl is emptying overnight. Maybe not totally, but enough to have to crank, crank, crank... to fill it back up. With a 6 volt system, it might feel like an eternity.

    Does your oil smell like gas at all?
     
  17. May 6, 2016
    termin8ed

    termin8ed I didn't do it Staff Member

    Mason, MI
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    Without trying to start it watch down the carb and see if its actually squirting gas out when the throttle linkage moves.

    Start with that first. Let us know if its squirting out first pump after sitting
     
  18. May 6, 2016
    mayday

    mayday Sponsor

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    Oil doesn't smell like gas, just rebuilt fuel pump last weekend. I'm going to check the bowl in morning. The choke does pull the throttle linkage.
     
  19. May 10, 2016
    mayday

    mayday Sponsor

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    I finally got time to look at the yf carb as I was checking things over I found that the accel pump wasn't pumping to get fuel in the bowl. After changing the check valve and the linkage to the slider that connects to the pump. Seems to work good now. I'll know for sure in the morning. Has anyone else had so many issues with rebuild kits? Thanks for all the help!
     
  20. May 11, 2016
    ITLKSEZ

    ITLKSEZ Hope for the best, prepare for the worst

    Liberty Lake, WA
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    I'm a little confused by your last post. The accelerator pump pulls fuel out of the bowl and pumps it into the throat of the carb.
    I'm guessing you mean you worked on the main fuel pump?
     
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