Time to play Name That Vacuum Port!

[88trailblazer]

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
.

 

[1979jimmy350]

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

 

[dmanblazer]

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

 

[4X4HIGH]

(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

 

[pauly383]

Go here clicky , look at my pics of my running and passing emissions 83 q-jet

 

[dyeager535]

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.

 

[pin_it_to_win_it]

Aww But I Hate This Game!!!!!

 

[K5er4Life]

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!

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.

 

[pin_it_to_win_it]

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.

 

[88trailblazer]

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.

 

[Grim-Reaper]

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
.

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