Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

7044262 Cruise Surge after rebuild

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Kenth:
Carter-made qjets are cast in poorer porous materials than those made by Rochester, and it is common for buns to appear in the most unexpected places, including the hole for the power piston. Therefore, the hole should be inspected and sanded / ground if necessary, not the power piston.
Also, the idle circuit is somewhat leaner in the Carter unit with .036" idle tubes, .055" upper idle air bleeds and .043" idle channel restrictions where Rochester uses .038" idle tubes, .059" upper idle air bleeds and .049" channel restrictions.
The main circuit upper air bleeds in air horn is .047" for Carter and .083" for Rochester.

I have found these units works well with .038" idle tubes, .051" upper idle air bleeds, .055" idle channel restrictions, .070" upper main air bleeds, .073" main jets with #43-#45 primary rods and DA or CE secondary rods. CK sec. rods works fine on std engines.

FWIW

Ponchojoe:
Thanks for the info Kenth. I used triple 000 steel wool to polish the piston. I did find last night that the spring clip that puts tension on the primary rods had moved and was actually hitting the gasket so it would not allow full piston travel downward. I don

Ponchojoe:
Why does this site keep cutting off my replies???

tayto:
try hitting preview before you hit post

Ponchojoe:
Pulled it apart, reset float level, changed primary piston spring to a heavier version and added 72 jets. It could still use an idle air mod but it runs well now.
Thanks

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