Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

My carb...

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Freddiesbuick:
I don't have a huge big block Pontiac or Buick with loppy cam. But what I do have is more for street with some 'umf' and a V6 carbed turbo, (Buick). Made my own carb, (Frankenstein-chestor) from a Pontiac and various other carbs and an '82 throttle plate. I opened up some idle bypass thinking it won't hurt. As I was running old school grease monkey tests, (cupped hands over air-horn testing for a vacuum leak), it splashed my hands with fuel. I thought that was weird. I do have a vacuum leak in it, (I think it's in the hot-idle compensator). But I don't think the by-pass idle mod would cause that would it?

As expected cupping my hands over it increased the idle quite high and uncupping causes it to struggle back up to an temp acceptable curb idle. It's the fuel splash that gets me. :o

Shark Racer:
Are the air-horn and main body a matched pair?

Plugged pump holes could cause this as well.

Freddiesbuick:
Yeah the airhorn and main body are one. As far as plugged pump openings...I blasted that carb with compressed air to the extreme of clean.

Shark Racer:
Was the splash coming from the air horn or just in front of it?

Freddiesbuick:
From within the airhorn, right out the boosters.   :o

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