Posted by Bruce(OR) on June 30, 2022 at 11:10:27 from (70.57.116.22):
In Reply to: Need a Quadrajet guy posted by Fritz Maurer on June 29, 2022 at 17:40:44:
I'll throw my 2 cents in. Looking at that pic, it appears your throttle is partially open. Looking at that item, the vacuum chamber is built so that engine vacuum actuates that item pulling the idle up. Once the engine is shut off, that part loses a vacuum signal and the throttle closes more. Anti-diesel would seem to be the desired effect. I disposed of dozens of Quadrajets many years ago. Your application might not need this item.
Distributor to manifold vacuum source is a cheating trick. It is a work around for spark knock without having to rebuild the engine. With ported vacuum, You step on the gas, Vacuum signal increases, timing advances and the engine rattles itself up to speed. With manifold vacuum, you step on gas, vacuum signal is less, timing advances slower and the engine gets up to speed.
As for carb adjust, the GM Lean drop is the best I have found. Radio antenna is good, or the door frame/handle is fair. A glass of water is a good indicator and when you can balance the nickel, your doing good.
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