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Technical 235 running rough low rpms

Discussion in 'The Hokey Ass Message Board' started by schmmich, Jan 20, 2016.

  1. schmmich
    Joined: Jul 29, 2014
    Posts: 26

    schmmich

    I've recently got my 53 running after sitting for over 20 years. its idling really smooth, the problem occurs when i give the throttle a lil rap, it coughs and stutters and almost dies. if i give it a lil more throttle the problem goes away. Im convinced the vacuum advance is not actuating properly, does that like the symptoms?
     
  2. 302GMC
    Joined: Dec 15, 2005
    Posts: 6,816

    302GMC
    Member
    from Idaho

    You can see the advance move the dist. if it's working.
    The leather acc. pump in the carb is dry & shrunk. Clean the carb.
    I'd start by tuning it - comp. test, adjust the valves, etc.
     
    Last edited: Jan 21, 2016
  3. Truck64
    Joined: Oct 18, 2015
    Posts: 4,622

    Truck64
    Member
    from Ioway

    Agree that sounds like the "pump shot" isn't enough. Not vac advance related. With engine OFF look down throat of carb and watch for a stream of fuel in each barrel when throttle is actuated. This prevents a "bog" or hesitation on acceleration.
     
  4. schmmich
    Joined: Jul 29, 2014
    Posts: 26

    schmmich

    sorry for the delay guys, the carb is fresh off a rebuild. new acc. pump. etc.
     

  5. jcmarz
    Joined: Jan 10, 2010
    Posts: 4,633

    jcmarz
    Member
    from Chino, Ca

    Maybe the Throttle linkage is binding.
     
  6. bowtie56jw
    Joined: Aug 2, 2010
    Posts: 214

    bowtie56jw
    Member

    distributor weights are most likely frozen up
     
  7. Bearcat_V8
    Joined: Sep 21, 2011
    Posts: 371

    Bearcat_V8
    Member
    from Dexter, MI

    Check the distributor shaft. They are known to wobble due to worn bushings.
     
  8. rebuilt carb? sounds like accelerator pump is dry and not shooting enough to remove the off idle stumble.
    remove acc pump, if its a leather skirt, soak in motor oil for a while it will soak up and swell and work again....sometimes. if its rubber, replace it.
     
  9. schmmich
    Joined: Jul 29, 2014
    Posts: 26

    schmmich

    the mechanical advance is functioning correctly.
     
  10. sunbeam
    Joined: Oct 22, 2010
    Posts: 5,220

    sunbeam
    Member

    vacuum leak?
     
  11. 54fierro
    Joined: Jul 6, 2006
    Posts: 493

    54fierro
    Member
    from san diego

    all good suggestions. Check your timing and since the carb was recently rebuilt make sure you have the right gasket.
    pic from HAMB archives :)
    [​IMG]
     
  12. schmmich
    Joined: Jul 29, 2014
    Posts: 26

    schmmich

    when i rebuilt the carb i put a new bakelite insulator on it with the slot for the vacuum and i cut my own gaskets with the opening. i checked the timing a month ago its either 6 or 9 degrees advanced i cant remember what one.
     
  13. 54fierro
    Joined: Jul 6, 2006
    Posts: 493

    54fierro
    Member
    from san diego

    If you have a spare condenser throw it on. I struggled pinning down a stumble, a new condensor fixed the problem after trying just about everything else. Good luck. Cesar
     
  14. Baumi
    Joined: Jan 28, 2003
    Posts: 2,743

    Baumi
    ALLIANCE MEMBER

    Yes, I also think it may be a lean condition , I my case the vacuum canister diaphragm was torn and leaking. .. so the advance didnt keep up and it was running leaner than it should...just my 2 cents. ..
     
  15. Daniel Goldman
    Joined: Jan 9, 2016
    Posts: 17

    Daniel Goldman

    Try to choke it a bit. Pinch down on the choke and see if it still does it. If that stops the problem maybe a bigger pump shot. Had a similar problem. Idle being too low can also hurt.
     

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