Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem
Sudden extreme rich condition
Cliff Ruggles:
The pull-off should be easy to fully compress with the engine off and it should hold vacuum.
When released it should fully open in about 2-3 seconds.
If it is difficult to move or doesn't release quickly it needs to be replaced....
MP81:
I'll check that. Could that not allow the choke flap to open fully, or would it cause other issues and not that?
Cliff Ruggles:
The pull-off only unloads the choke flap on cold starts and unless something is bent it will NOT contact any parts of the fast idle cam or choke linkage to prevent it from fully opening.
The electric choke does the rest, and the flap should be fully open in about 2-3 minutes, depending on how you have the electric choke adjusted.......Cliff
MP81:
Finally got around to checking - I can compress the pull-off when the engine is off, so that seems to be fine.
Ran a wire right to the 12V terminal and in a few min, the choke blade was all the way open - so it's definitely due to the low voltage at the connection...it's confusing, though - how can that wire just suddenly have low voltage? It was fine earlier in the year...
Cliff Ruggles:
The choke needs high current flow to work correctly so there must be an issue someplace with the wiring and it is lacking "potential" to effectively supply the choke with enough current to work like it's supposed to.
That is a very easy problem to correct, you can run a new wire to it from a "keyed on" source. I like to go to the wiper motor as there is one wire there that works well for that purpose......Cliff
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