Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem
Missing Vacuum Port? what do i do?
72Campcust:
--- Quote from: Cliff Ruggles on February 05, 2013, 05:02:35 AM ---A vacuum gauge hooked to the port with the engine running is th easiest way to determine which port does what.
You can also remove the carb and look at the lower fitting to see if it has a bleed off port to reduce vacuum as the throttle plates open.....Cliff
--- End quote ---
Cliff-- I hooked a vacuum gauge up to the port you suggested, when i throttle the engine up the vacuum climbs in correlation with RPMs. Do i still need to take it apart to see if it has the "Bleed Off" you mentioned? I'm hoping to avoid taking it all apart, unless the chances are pretty good that this does have the bleed off.. (carb #17057512). Am i testing it right by revving the engine up and watching the vacuum gauge..
Cliff Ruggles:
The vacuum reading should go to full vacuum right off idle, and mimic what is seen on a manifold vacuum source. The bleed off port reduces signal, so the readings are lower....Cliff
72Campcust:
Thanks Cliff, If i remember right the vacuum pressure climbed with throttle input.. so, guess i need to plug the bleed port..
hopefully last questions..previously you mentioned that the bleed off slot can be filled with epoxy.. can i plug the bleed slot without taking the carb apart, IE just pull the carb off the manifold and flip it over and fill in the bleed slot..or do have to disassemble to get to it.
is it obvious what I'm supposed to plug with epoxy?
thanks
72Campcust:
--- Quote from: Cliff Ruggles on January 27, 2013, 05:59:48 AM ---Currently you have it hooked to FULL manifold vacuum.
The lower left fitting in the baseplate is ported vacuum, but may have a "bleed" off port and not work for the distributor, if ported vacuum is needed for the vacuum advance. The bleed off slot can be filled in with epoxy, if it is present, providing strong ported vacuum to that fitting.....Cliff
--- End quote ---
Is it obvious what i need to plug if i take the carb off of the manifold.. or do i need to disassemble the carb to do this..?? :)
Cliff Ruggles:
Just remove the two long screws in the back and the screws holding the baseplate to the main casting, it will come right off for repairs/modifications....Cliff
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version