Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

17084226 tip in

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65malibu:
I was trying to zero in my part throttle today and did the tip in. With 74 jets and Cliffs 50M rods, I started at 3.5 turns out on the APT screw. The engine rpm finally picked up at 1 turn out. Is that an indication that I should go down to 72 jets or will it be ok? With the screw only out 1 turn, where does that put the taper on the needle in relationship to the jet?

Kenth:
At 1 turn they are as low as they can be.
The APT starts rising the piston/rods at 2 turns up from bottom.

65malibu:
I did check when the needle hanger starts to move when I had it apart and the pin starts to make contact around 1 1/2 turns from the bottom.
Should I go down on the jet size to bring the needles up more into the taper?

Kenth:
It´s the result with tip-in that counts and with a slight rpm pick-up with the APT 1 turn up and no driving issues i would say it´s good as is.

quadrajam:
I agree with Kenth. Should be good.

QJ

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