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Not sure where a few vacuum lines go on my Q-Jet, (pic)

Discussion in 'The Garage' started by Scott A, Jul 10, 2004.

  1. Scott A

    Scott A 1/2 ton status

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    I have the back one blocked off /forums/images/graemlins/confused.gif
    Carb is a 1979 vintage.
    Does anyone have a vacuum hose diagram for my carb /forums/images/graemlins/confused.gif I think I have some other hoses on my carb either hooked up wrong or plugged /forums/images/graemlins/blush.gif where they should be going some place...
    [​IMG]
     
  2. dyeager535

    dyeager535 1 ton status Premium Member

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    Re: Not sure where a few vaccum lines go on my Q-Jet, (pic)

    The rear upper one is a clean air feed IIRC...on the Oldsmobiles, that has a line running to a hot air tube, which runs into the intake, which gets heated up pretty quickly obviously.

    The choke "sucks" air through it, so that there is heated air getting into the choke, which heats it up faster. (no electric choke)

    Your's looks like a Cadillac carb, but I'm not positive that Chev didn't use the same choke on some models. What are the casting numbers on the drivers side rear, near the long vertical bolt? (that one should start with 170...then a few other numbers) Been so long that I looked at mine, I can't recall if the Olds is similar to yours or not.

    I'd plug both of them, but check to see if they suck while it's running. The rear one definitely won't hurt idle, not sure on the choke one. But you don't really want the rear one "open", as it could potentially suck crud in AFTER the air cleaner.
     
  3. Scott A

    Scott A 1/2 ton status

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    Re: Not sure where a few vaccum lines go on my Q-Jet, (pic)

    17059507
    0829 CSS
    Decode site
     
  4. Scott A

    Scott A 1/2 ton status

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    Re: Not sure where a few vaccum lines go on my Q-Jet, (pic)

    So, I plug both? hmmmmm
     
  5. pauly383

    pauly383 Daddy383 Staff Member Moderator

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    Re: Not sure where a few vaccum lines go on my Q-Jet, (pic)

    [ QUOTE ]
    Your's looks like a Cadillac carb, but I'm not positive that

    [/ QUOTE ]

    I thought B.O.P and Caddy had the fuel inlet pointing straight out the front of the casting . On my Chevy truck, that "a" on the back went to tha air cleaner originally. His intake doesn't look to be compatible with hot air choke, as there is no tube bolted down on the side that goes down into head, looks like a divorced choke intake he is running /forums/images/graemlins/k5.gif
     
  6. Scott A

    Scott A 1/2 ton status

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    Re: Not sure where a few vaccum lines go on my Q-Jet, (pic)

    I am running an Edelbrock performer intake.
     
  7. pauly383

    pauly383 Daddy383 Staff Member Moderator

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    Re: Not sure where a few vaccum lines go on my Q-Jet, (pic)

    Then in your case I believe you can remove the black plastic choke piece, cap off the hose connection, and bolt the black plastic electric choke piece in there . /forums/images/graemlins/k5.gif
     
  8. Scott A

    Scott A 1/2 ton status

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    Re: Not sure where a few vaccum lines go on my Q-Jet, (pic)

    I have a feeling that 'A' & 'B' goes to this.
    [​IMG]
     
  9. pauly383

    pauly383 Daddy383 Staff Member Moderator

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    Re: Not sure where a few vaccum lines go on my Q-Jet, (pic)

    More than a feeling, thats a fact , Just bolt the electric choke piece in there where the hot air coil is /forums/images/graemlins/thumb.gif
     
  10. dyeager535

    dyeager535 1 ton status Premium Member

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    Re: Not sure where a few vaccum lines go on my Q-Jet, (pic)

    [ QUOTE ]
    I thought B.O.P and Caddy had the fuel inlet pointing straight out the front of the casting .

    [/ QUOTE ]

    BOP does for sure, but pretty certain that either Cadillac was all like the SBC, or some were. Remember how they used to run the huge air compressor right over the top center of the engine? That's why they had them come out the side.
     
  11. ColAdo82K5

    ColAdo82K5 1/2 ton status

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    I have that same carb and manifold on my truck.
    Both of the ports you are looking at can go to the "hot air style" choke that goes into that passage that you have blocked off with that small plate and two allen head bolts. I have both of mine blocked off, because I don't use that style of choke.
    I took the electric choke element out of my original 80's carb and put it into that round black housing. Splice into the smaller wire from your alternator plug to get the juice. That wire is only hot when the engine is running.
    AND THERE YA GO ! electric chokes are the way to go.
    Blake
     

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