Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem
Missing Vacuum Port? what do i do?
72Campcust:
Thanks, appreciate the feedback.. the wife is getting anxiuos to get the truck out of the garage.. :)
Cliff Ruggles:
Correct, the bleed-off hole is behind the slot, and uncovered as the throttle plates open. The first photo is idle bypass air, under the throttle plates....Cliff
72Campcust:
So-- wanted to provide a wrap up for this; plugged the hole as suggested by Cliff.. truck runs great now! I have had to redo all my Idle Screws/APT settings now that the idle has changed but definitely have noticed a difference in performance..power/acceleration at all speeds...now just need to dial in the settings and i think ill be good!
On another note, while i had the carb apart i changed the heater Core (it was leaking BAD), painted the valve covers and repaired some cab rust (since the carpet was out...)
Thanks for all the help Cliff/Everyone-- and patience with me finding the right hole to plug!
Cliff Ruggles:
Good news! Strong ported vacuum works great to apply the advance so you get maximum efficiency at cruise, but no additional timing coasting and at idle speed.
Some engines just don't need all that timing at idle, and it's nearly impossible to get them thru emission testing as well, if you are using MVA to the distributor.....Cliff
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