Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

Idle is too HIGH

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Jeffs68:

--- Quote from: novadude on September 21, 2016, 07:39:54 AM ---Why not just use ported vacuum so you can put the initial timing back where it needs to be?

--- End quote ---
I've got a couple other things to look at, that will be one of them this weekend.

Cliff Ruggles:
Some engines do NOT like all that timing at idle.  Re-set the timing and move the vacuum hose to the advance over to ported vacuum.......Cliff

Jeffs68:
Update-

Reset timing to 12-13 degrees, no vacuum advance. Moved to ported source on carb.

Idle is good now.

One other thing about the APT adjustment. On the stock Qjet iron intake (1968) there is the vacuum port smack dab in front of the APT screw...impossible to adjust on the fly.

With the "Tip In" procedure I'm getting a drop in Revs, as opposed to the slight increase. Which way do I turn the screw to get it dialed in?

Cliff Ruggles:
With 39B rods and 69 jets you will most likely not have control with the APT system anyhow in that carburetor.  I would replace them with larger rods, then employ the APT for fine tuning the part throttle A/F via the APT screw in the baseplate.....Cliff

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