Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor

Primary jets and rods for AFR?

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lrust:
I am at around 15 or so AFR at 2,200 RPM on highway.  My Qjet has APT and I need to change primary jets and rods - I have spare sets from old carbs - is there anything special to the APT configuration requiring unique jets and rods?  thanks in advance.

lrust:
meant for the title to say "Primary Jets and rods with APT"....

Cliff Ruggles:
Not enough info.

What is the carburetor part number?

What are the engine specs and application?

What have you done to the carb and what jet/metering rods are you currently using in it?

How is the distributor set up and how much timing does the vacuum advance add at light engine load?......

lrust:
Carb is 17057504 w 69 jets. I haven't opened it since it was rebuilt by your shop ~ 2017.  Pontiac 455 w SD OF cam and 670 heads.  HEI w 10 degrees initial and about 15 vacuum advance, 20 mech n by about 2,000

Cliff Ruggles:
Does the engine stumble, bog, hesitate, backfire or surge at part throttle or going to part throttle off idle?

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