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Thread: Carb stumble
          
   
   

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  1. #1
    ojh
    ojh is offline CHR Member Visit my Photo Gallery
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    Carb stumble

     



    Is there a relationship between carb stumble at idle and valve lash? ie, intake too tight? or too loose?
    With engine at idle and hit the throttle it will stumble (235 chevy w/ 1bbl carter) but i pull choke out some it will act ok - in brief if i restrict the air the motor won't stumle at hit of throttle. All else seems good, ignition etc. I was wondering if i have intake valve lash too tight nwill it show up as stumble?

  2. #2
    cffisher's Avatar
    cffisher is offline CHR Member Visit my Photo Gallery
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    I would look at the carb or carb gasket or intake gasket. by pulling choke out part way your restricting air with a gasket leak your getting to much air and it stumbles.
    Charlie
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  3. #3
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    Choke can compensate for vacuum leak, as mentioned in previous post.

    Also, a faulty accelerator pump will cause your symptom.
    .
    Education is expensive. Keep that in mind, and you'll never be terribly upset when a project goes awry.
    EG

  4. #4
    techinspector1's Avatar
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    Quote Originally Posted by firebird77clone View Post
    Choke can compensate for vacuum leak, as mentioned in previous post.
    Also, a faulty accelerator pump will cause your symptom.
    ^times 2........
    PLANET EARTH, INSANE ASYLUM FOR THE UNIVERSE.

  5. #5
    jerry clayton's Avatar
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    check for wear on the throttle blade shaft in the carb housing--those are old carbs and thats wear they where-----------

  6. #6
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    Ist make shue your carb is working right, the accelerator rod is tight so that the pump acuates as soon a you move the carb linkage. I had a 250 6 once and found that the linkage had worn just a bit and then you would have a stumble on throttle tip in as the fuel was not getting there soon enough . Make shure you are getting a good squirt also from the accelerator pump .

  7. #7
    ojh
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    I appreciate all the response guys, but this is an old thread that somehow got reborn. I hate to see you pondering a a non-existant problem.

  8. #8
    jerry clayton's Avatar
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    well---did you fix it???????????

  9. #9
    canadianal's Avatar
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    yeah we wanna know

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