Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem
Heavier throttle (mostly) issues
lightning boy:
3/16" is not the float height.
this thread was painful to read.
MP81:
3/16" in from the toe of the float, like the measurement method calls for.
The float height is 11/32" down, which is what I said the post before (hence the 0.344" on the caliper).
MP81:
Pulled the Idle Air Bleed Valve out to check the O-rings since, for whatever reason, I didn't the first time. Upper O-ring looked mostly fine, but the lower one was a bit...flat:
Upper O-rings - new (left) vs old (right):
Lower O-rings - new (left) vs old (right) - can see how much "flatter" the old one was:
I adjusted it 4.5 turns back from bottomed.
Cliff Ruggles:
Even the slightest air leak past those "O" rings will make tuning impossible. In most cases when I get into a CCC carb they are cracked, split and leaking pretty bad. Since they route air to the idle system they will have a significant impact on idle fuel control at the mixture screws, and fuel to the off idle transfer slots which can lead to poor idle quality, and lean off idle (hesitation/stumble/bog) even if everything else in the carb and computer stuff is working correctly......Cliff
MP81:
Good to know! I would honestly not be surprised if that lower O-ring was not sealing all that well, given it was pretty squared off.
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