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Rochester 2G won't idle and stalls if not partially choked

Discussion in 'Early CJ5 and CJ6 Tech' started by OrangeCJ5, Feb 1, 2016.

  1. OrangeCJ5

    OrangeCJ5 Sponsor

    It just won't idle when warm. If I rev it, it will stay running.
     
  2. OrangeCJ5

    OrangeCJ5 Sponsor

    If I disconnect the choke and manipulate it manually, same problem.
    The fuel filter at the carb inlet is the glass filter that I can see inside of
     
  3. Glenn

    Glenn Kinda grumpy old man Staff Member

    I forgot to ask about the hold down bolts for the carburetor. Any chance they have bottomed out and are not pulling the base down tight?
     
  4. OrangeCJ5

    OrangeCJ5 Sponsor

    tight to the intake manifold? I sprayed carb cleaner at the base while it was running and got no increase in revs. I replaced that gasket on Wed. I assume they are ok?
     
  5. ITLKSEZ

    ITLKSEZ Hope for the best, prepare for the worst

    That tells us it's most likely a shellac buildup or a clogged jet in the carb. Doing that forces fuel to enter though the venturis to compensate what it isn't getting through the idle jets.

    Go to napa and grab their carb dip tank. It comes in a gallon paint can. Follow the instructions and try it again. It can't hurt.
     
  6. Glenn

    Glenn Kinda grumpy old man Staff Member

    When you drove it did it seem to have plenty of power? Take your foot off of the gas and it just immediately dies out, or coughs and sputters and then dies?
     
  7. Glenn

    Glenn Kinda grumpy old man Staff Member

    Probably ok, it's just easier to verify and be sure of tightness with studs versus bolts.
     
  8. Glenn

    Glenn Kinda grumpy old man Staff Member

    I agree. Using the spray cans with a tube after that helps verify that circuits are clean and free since you can see the liquid go through it versus just blowing air and assuming. Brake cleaner or the like in spray cans is your friend. :)
     
  9. PeteL

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

    ..until it blows back from a blocked passage directly into your eyes. Don't ask.

    :cry::cry::cry:
     
    Focker likes this.
  10. SFaulken

    SFaulken Active Member

    This is why you wear your safety goggles while doing it =P

    (Actually, I forget about 90% of the time, and end up shooting myself in the face....)
     
  11. Glenn

    Glenn Kinda grumpy old man Staff Member

    That is why you spray yourself in the face ahead of time so you get that little issue out of the way already. :);)
     
    Focker and ITLKSEZ like this.
  12. Focker

    Focker That's a terrible idea...What time? Staff Member

    JMO

    The dip buckets are a good idea but they get gross over time and you end up buying another...and...

    I popped the $80 on the HF Ultrasonic Cleaner and it works wonders. You can just use water, soapy water, Simple Green or Purple Power (preferred, it doesn't discolor metal like SG does). It can heat up the parts and clean things in a couple of minutes (auto shut off) or reset and start again for a deeper cleaning. I cleaned my 45 year old carb and couldn't smell fuel in it...Almost drank my coffee out of it. :D
     
  13. OrangeCJ5

    OrangeCJ5 Sponsor

    I will hit up HF today and get the carb sparkling clean!
    I'll spray myself in the face while the cleaner runs it's cycle.
     
  14. OrangeCJ5

    OrangeCJ5 Sponsor

    It seems to have good power. It does die immediately when taking foot off the gas. I wonder if a matched flamethrower coil couldn't hurt...
     
  15. Focker

    Focker That's a terrible idea...What time? Staff Member

    :rofl:
    Or a baseball bat? :sneak:
     
  16. ITLKSEZ

    ITLKSEZ Hope for the best, prepare for the worst

    Good to know. I've never used either. I recommended the bucket from others' experiences. Personally, I've held the bucket in my hands, on the fence about buying it, and had a hard time paying the price for an expensive can of what the ingredients say is nothing more than fels naptha (paint thinner). I assumed there must be more to it, but you're probably just paying for the fancy dipping strainer it comes with.
     
  17. OrangeCJ5

    OrangeCJ5 Sponsor

    What about the reference point on the brass float for when I'm putting back together after the cleaning? Where on that float do I measure to?
     
  18. Glenn

    Glenn Kinda grumpy old man Staff Member

    I honestly can't see it helping anything at this point.
     
  19. Focker

    Focker That's a terrible idea...What time? Staff Member

    Yep. I've only bought one of these because of the reason you gave. It worked great but it's slow and now it's syrupy after I only used it once...Years ago. Plus if the little parts fall out of the basket you have to sift through the dark murk. I still have one on the shelf...Just can't seem to toss it because I'm too cheap.

    Purple Power is my go to...You can dilute to suit. <--- Didn't mean to make them a slogan. :rolleyes:
     
  20. Focker

    Focker That's a terrible idea...What time? Staff Member

    I just edited post #49 with more information/diagrams.
     
    Last edited: Feb 5, 2016