Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

Missing Vacuum Port? what do i do?

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72Campcust:

--- Quote from: Cliff Ruggles on February 19, 2013, 03:54:46 AM ---The round hole inside the bore just aft of the slot that provides ported vacuum.....Cliff

--- End quote ---

Cliff-- the hole that im pointing at now (down in the bore) is the only hole in the bore..is that the right hole to plug? (there are no other holes down in the bore that ive got the pencil down inside)

Or am i totally off the mark?? Sorry for so many questions.. i just dont want to plug the wrong hole..

Cliff Ruggles:
You're getting closer.....INSIDE the bore, just aft of the slot that provides vacuum.  As the throttle angle increases, the round hole is uncovered by the throttle plate, and kills the vacuum signal by bleeding off the source back to the main bore.....hope that helps some?.....Cliff

72Campcust:

--- Quote from: Cliff Ruggles on February 20, 2013, 05:19:05 AM ---You're getting closer.....INSIDE the bore, just aft of the slot that provides vacuum.  As the throttle angle increases, the round hole is uncovered by the throttle plate, and kills the vacuum signal by bleeding off the source back to the main bore.....hope that helps some?.....Cliff

--- End quote ---

guess my reference points are off..

Pic #1: Inside the bore there is this hole, which is below the throttle plate..


Pic #2: and these two holes are above the throttle plate..Pencil is pointing at the sloted hole, screwdriver is pointing at the round hole..

72Campcust:
Bump... :)

omaha:
I think it would be the "hole" that the screwdriver is pointing at. That would make sense as it is common with the slot, just at a different position in the throttle bore. I guess as the throttle opens, it provides vacuum to the slot but because the throttle blade is not past the hole yet, it is not a strong vacuum to the slot because of the hole being on top of the blade is bleeding off the vacuum(to the top off the throttle blade) once the blade passes the hole, then, vacuum signal would be returned, BUT, by the time your throttle get that far, the vacuum signal is not as strong any way. (unless your just at light cruise or slowing down from heavy throttle.) That is wild how just one carefully placed hole can have such an effect. like that.  Good luck!!

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