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235 help!!!

Discussion in 'The Hokey Ass Message Board' started by Keith English, Aug 23, 2012.

  1. Keith English
    Joined: Apr 20, 2006
    Posts: 400

    Keith English
    Member

    Ok heres the deal..my 235 in my 53 is given me a problem i cant figure out..please help..it will start and run till it gets warm then it dies unless i keep the choke hrotpulled half way or the throttle slightly pushed..it will not run by itself when it gets to running temp..its a 54 engine bored forty over..fentons single carb rebuild..new plugs,wires,cap,points, and co.densor..it ran fine at first..any help please
     
  2. pinkynoegg
    Joined: Dec 11, 2011
    Posts: 1,135

    pinkynoegg
    Member

    sounds like a carb issue. i had a problem with one not running unless the choke was pulled. i rebuilt the carb and she was good to go. you said it was rebuilt. do you have the mixture set correctly?
     
  3. Keith English
    Joined: Apr 20, 2006
    Posts: 400

    Keith English
    Member

    Probably not i hate messen with carbs...i set it at a full turn.. and a quarter out..
     
  4. pinkynoegg
    Joined: Dec 11, 2011
    Posts: 1,135

    pinkynoegg
    Member

    hmm i would check that. like i said, sounds like a carb issue and not an engine issue
     

  5. Keith English
    Joined: Apr 20, 2006
    Posts: 400

    Keith English
    Member

    Ok i will..thanks man
     
  6. 72hd
    Joined: Mar 22, 2012
    Posts: 113

    72hd
    BANNED

    check carb body to base tightness . grab top of carb & twist side to side-for some reason they loosen in that area-I've had two that acted like yours is acting &fixed both by pulling carb & tightening 2 screws
     
  7. jcmarz
    Joined: Jan 10, 2010
    Posts: 4,636

    jcmarz
    Member
    from Chino, Ca

    did you remember to put this between the carb and the intake?
     

    Attached Files:

  8. Good advice, I was just going to say that! It acts as a giant vacuum leak and the choke being on compensates for it. I used to see them loose on almost any Chevy 1 BBL I had in for a tune up.

    I would check for a gross vacuum leak first, just so you can see the difference. Let it run with the air cleaner off, place your hand over the top of the carb, if the idle picks up and it smooths out, you have a vacuum leak.

    Bob
     
  9. Snarl
    Joined: Feb 16, 2007
    Posts: 1,639

    Snarl
    Member

    Vac leak or plugged idle circuit. Make sure the throttle shaft holes aren't overly worn. If they are, you'll need to get a different carb.
     
  10. APACHE FS
    Joined: Feb 20, 2007
    Posts: 569

    APACHE FS
    Member

    My throttle shaft bushings were worn on mine did the same, also make sure the spacer block doesn't have small hairline cracks, seen that too
     
  11. d2_willys
    Joined: Sep 8, 2007
    Posts: 4,110

    d2_willys
    Member
    from Kansas

    You have an exhaust manifold heat valve? If that is sticking and is not opening, it could make the engine run rough and not idle. Check that out too.
     
  12. Keith English
    Joined: Apr 20, 2006
    Posts: 400

    Keith English
    Member

    checked everything out, all the screws and bolts are tight, the spacer has no cracks that i can find..tried to re-adjust my mixture but doesnt seem to change anything no matter where i have it. pulled the breather and put my hand over the top and it killed the motor so i am thinkin there isnt a vac leak any were. i am goin to order a rebuilt one from the local parts house and try that. i need to get the ol girl back on the road. thankd for all the help guys, if a diffrent carb dont help i might bring this thread back up...lol
     
  13. JohnEvans
    Joined: Apr 13, 2008
    Posts: 4,883

    JohnEvans
    Member
    from Phoenix AZ

    As d2 willys said CHECK the heat valve on the exhaust manifold for free operation . Stuck closed or partly so will cause your symtoms.
     
  14. nashvegas99
    Joined: Feb 29, 2008
    Posts: 526

    nashvegas99
    Member

    the ol 235 that I had was the valve in the exhaust manifold and the spring that goes on there. it was broken and I had to add a piece and spot welded it to the proper length and curled it up a little bit.
     
  15. Keith English
    Joined: Apr 20, 2006
    Posts: 400

    Keith English
    Member

    I maybe miss understanding, but mine only has the stock intake, i removed the exhaust and added fentins...is the valve u guys are talkin about in the lower part of the intake were the two were bolted together?
     
  16. JohnEvans
    Joined: Apr 13, 2008
    Posts: 4,883

    JohnEvans
    Member
    from Phoenix AZ

    Yep ,with the Fentons you no longer have the heat valve.
     
  17. Keith English
    Joined: Apr 20, 2006
    Posts: 400

    Keith English
    Member

    ok thats what i was thinking just maken sure tho
     

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