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nhramnl · 10-03-2013, 01:33 PM

Things I would check:

Fuel pressure - it can't exceed 7psi. If it does, the pressure can blow the needle off of the seat and the carb will flood. Look for fuel dribbling from the booster clusters and listen for irregular "hissing" sound.

Float level - can't be too high, or the carb will dribble fuel into the venturis and the carb will flood.

Secondary hanger and rods - make sure the rods are fully seated in the orifices with the car at idle. The air door must be completely closed (not adjusted to provide additional idle air) because it can pick the rods up and allow secondary fuel.

Make sure the inability to achieve a stable idle is actually due to richness and not simply the result of a vacuum leak. Use the carb cleaner diagnosis method.

10-03-2013, 01:33 PM	#8
nhramnl Senior Member Join Date: Feb 2010 Posts: 507 Likes: 8 Liked 358 Times in 83 Posts	Re: Quadrajet issue Things I would check: Fuel pressure - it can't exceed 7psi. If it does, the pressure can blow the needle off of the seat and the carb will flood. Look for fuel dribbling from the booster clusters and listen for irregular "hissing" sound. Float level - can't be too high, or the carb will dribble fuel into the venturis and the carb will flood. Secondary hanger and rods - make sure the rods are fully seated in the orifices with the car at idle. The air door must be completely closed (not adjusted to provide additional idle air) because it can pick the rods up and allow secondary fuel. Make sure the inability to achieve a stable idle is actually due to richness and not simply the result of a vacuum leak. Use the carb cleaner diagnosis method.