Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

Q-jet won't idle when engine warms up

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429bbf:
greg reread the post . first the idle air screws are fuel. in is less fuel ,out is more fuel. if your choke has screws and not rivets loosen the screws and put a screwdriver in the end and turn clockwise (i think thats right )until the choke flap opens all the way.up this should help you make a little head way . i see the front pullout is attached to the secondaries, if it is hooked to the choke you do not need the rear pulloff.hth

Greg Kennedy:
Thanks 429bbf.
Mine is the kind with 3screws. I have tried loosening the screws and adjusting the choke valve.  But I was turning it until the choke valve closed when the engine was cold.
I can try turning it now till it's totally open,  but should I do it with a cold or warm engine?

77cruiser:
Does the choke ever open when it warms up?
If the carb originally had an electric choke it might not have the vacuum passage & won't pull in the hot air to heat the coil.

Greg Kennedy:
Yes, it does have the metal tube that comes up from the engine to deliver heat right to the choke coil.

carmantx:
The 17081282 should have been an electric choke Quadrajet originally, which would mean that the vacuum port in main body to the choke housing is NOT open.  So even if you have the metal line connected, there is no vacuum to pull the hot air in to the housing.  So you need to put an electric choke element on that carb for it to work properly.

And set the choke, with engine warm, to full open position.

The choke flap is closed in your pictures, and think that may be at least part of your issues.  Fix that first, or at least open choke flap all the way before other diagnosis.

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