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Calling all Q-jet experts

Discussion in 'The Garage' started by pvfjr, May 5, 2005.

  1. pvfjr

    pvfjr 1/2 ton status

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    What would cause fuel to come bubbling up out of this hole? This things been loading up a lot, had a rebuild, ran for a bit, then just took a crap.

    [​IMG]
     
  2. MEPR

    MEPR 1/2 ton status

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    thanks for posting this while i was at work. I should also add that the needle and seat is new and held presure and also the float is set and in spec.
     
  3. big83chevy4x4

    big83chevy4x4 3/4 ton status

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    that is actually suppose to be a plug there. you remove the plug so you can adjust the main A/F mixture screw with out take the carb apart. if there is nothing there, there should be.

    when i rebuilt mine, i adjusted that screw wrong (1/2 turn off) it ran extremely rich and would not idle worth a dam. it would load up and die, then take forever to start again and had to clean it out. turn out is richer, turn in is leaner.
     
  4. pvfjr

    pvfjr 1/2 ton status

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    Looks like MEPR has it turned WAAAAAY out. Sounds like a pretty simple problem then. So Dillon, is there a screw in there, or is that missing too?
     
  5. pvfjr

    pvfjr 1/2 ton status

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    Well from the looks of another pic I took earlier, I *think* I see the screw, which would mean no plug. :blush:

    So is this the area in question then? Is that plug actually supposed to hold in fuel, or is it just supposed to keep dirt out? How many turns out is a good preset for that screw?

    [​IMG]
     
  6. MEPR

    MEPR 1/2 ton status

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    humm well i just ran that screw in tight. So if out is lean then that my problem. But i didnt read anything about that in my Q-Jet rebuild manual... :confused:
     
  7. big83chevy4x4

    big83chevy4x4 3/4 ton status

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    i didn't know about it either, another member here pointed it out and i adjusted it and now it runs like it should.
     
  8. pauly383

    pauly383 Daddy383 Staff Member Moderator

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    I barely moved mine between my 2 year emissions test , and forgot how much and surprised myself when I reset it to 2 out plus half turn more . I had mine out 4 turns , ran great blew too much co .

    From what I read on the net , the quality rebuilds and Edelbrocks usually have the APT 2 turns out when purchased , another half turn is perfect in my case ( well maybe perfect , retest next week ) .
     
    Last edited: May 6, 2005
  9. leadfoot067

    leadfoot067 1/2 ton status

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    on the edelbrock q-jets theres a tapped plug covering the hole...
     

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