Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

lean right off idle

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77cruiser:
Lean right off idle 25-30 mph AFR go to about 16. Go just a bit more & good AFR goes to mid 14.
Do I need to open the down channels more or the idle feed restrictions?
down channels --.055
idle feed--.036


Jim

Cliff Ruggles:
What is the carburetor number?  If it has an APT system try raising the metering rods slightly....Cliff

77cruiser:
17082292

When I go into the throttle just a bit more(I assume when the mains start up) it's fine.
I was thinking if I opened the down channel a little it would give more fuel to the transition slot & not upset the idle.
Is this right?

Cliff Ruggles:
Going into the throttle may be lowering the vacuum enough to raise the power piston?  I would leave the idle system as is, and raise the APT first.

What source (manifold or ported vacuum) are you using for the vacuum advance?.....Cliff

77cruiser:
Manifold, I have about 10.5-11 in. vac @ idle.

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