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Time to play Name That Vacuum Port!

Discussion in 'The Garage' started by 88trailblazer, Sep 27, 2006.

  1. 88trailblazer

    88trailblazer 1/2 ton status

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    Okay I am replacing the old Holley with a rebuilt Q-jet and most of the vacuum lines are missing or plugged. As far as I can tell, "G" goes to the brake booster, and I believe that "C" goes to the PCV valve (I may be wrong). I have no idea where the distributor advance goes to or the canister. Please hook a K5 brother up with some info
    .:confused:

    [​IMG]

    [​IMG]

    [​IMG]
     
  2. 1979jimmy350

    1979jimmy350 1/2 ton status

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    it does not matter as long as you hook up manifold vaccum where needed and port vaccum if used where needed
     
  3. dmanblazer

    dmanblazer 1/2 ton status

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    D goes to your vac adv. other then that I would leave the rest plugged unless you live in smog state.
     
  4. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    (A) = not sure leave plugged for now
    (B) = Charchoal cannister
    (C) = PCV valve
    (D) = Manifold vacuum = Ported vacuum switch (i believe)
    (E) = not sure leave plugged for now
    (F) = Vacuum advance
    (G) = Power brake booster
     
  5. pauly383

    pauly383 Daddy383 Staff Member Moderator

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    Go here clicky , look at my pics of my running and passing emissions 83 q-jet :thumb:
     
  6. dyeager535

    dyeager535 1 ton status Premium Member

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    Actually the ports are not all the same, the timing of the "timed" ports is different based on their location and shape of the hole in the venturi wall. And the "holes" are different.

    Just an FYI, all ports are not created equally. :)
     
  7. pin_it_to_win_it

    pin_it_to_win_it Registered Member

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    Aww But I Hate This Game!!!!!
     
  8. K5er4Life

    K5er4Life 1/2 ton status

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    I had that same problem when I got my crew cab, the PO had the vaccum lines all screwy so I reran them all and it was never better than new......well....except for that damn fire that went off under my hood! :angry1:

    This may or may not help as this sticker is for a '86 K30 with heavy duty emissions but it might allow you to see where some of yer hoses are suppossed to go.
    [​IMG]
     
  9. pin_it_to_win_it

    pin_it_to_win_it Registered Member

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    How much did u pay for the Q-jet? i need one for my 85 blazer and was trying to see how much im going to have to pay.
     
    Last edited: Sep 29, 2006
  10. 88trailblazer

    88trailblazer 1/2 ton status

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    thanks everyone for the help. i'll give it a try tommorrow.

    "How much did u pay for the Q-jet? i need one for my 85 blazer and was trying to see how much im going to have to pay."

    i got it for $150 from Advanced Auto Parts w/ a 1 year warranty.
     
  11. Grim-Reaper

    Grim-Reaper 3/4 ton status Author

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    On early 80's and older without vacuum pump as I recall (been a while since I tinkered on one).

    F,C,D are all manifold vacuum.

    F is usually the Thermac on the air cleaner.

    D will be PCV

    C is not used on lower 48 as far as I know. Might be used on Cali models or air pump models.

    A is EGR

    B is EVAP

    E is Distributor

    G is booster
     

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