Quadrajet choke pull-off

Is everything clean? Sometimes they can get a bit goo'd up and stick. Does it release with a blip of the throttle when warmed up?

This COULD be helpful...from the 86 Monte CSM.

CCC or regular Quadrajets have pretty much the same choke operation, so whether it's CCC or not doesn't make any difference, really.

On a cold engine, loosen the three screws on the choke perimeter. Move the choke plate to where its edge just kisses the metal of the air horn. Tighten the perimeter screws.

Apply vacuum to pull off with the mityvac and see if choke opens about 1/16 to 1/8 inch. If not, use the adjustment screw to set the opening about 1/16th inch.

Reset everything and car should start and maintain idle.

Some carbs chokes may end up being 2 to 3 times wider gap wise then others considering temp average and jets leakage mixture ect...setting in colder Temps should be best....it us possible to add lib a bit when you have enough experience...I have mentioned that back in the day I ran carbs with a small peice of wire or tin attached to the filter bolt that scotched the choke plate open in such a way but not be in danger of coming loose and getting into the engine I thought this worked out the same as the pullout fears aside " of course one can adjust something if it is in working condition

As stated, it has to be absolutely cold to set it. Loosen the screws, hold throttle open, and turn the coil cover so the choke flap is totally closed. Tighten the screws. Test the pull-off with a Mighty-Vac or other vacuum source. I like to start at 1/8 to 1/4 flap opening. Start engine. If it stalls, too much air, close the flap a bit. If it runs rough, not enough air, open the flap a bit. Use the screw on the pull-off to adjust. Do this until it works perfectly. The problem is waiting for it to be cold each time.

Remember the choke has to do three things right: On a cold engine, one tap of the gas pedal should close it completely. When the engine starts, it opens just enough to run smoothly. Then once the engine is hot, it opens completely. I have seen electric choke coils that were slightly out of kilter but still worked fine. By that I mean the hash marks on the coil housing did not correspond to the choke position. Even brand new ones. As long as it closes and opens correctly, don't worry about the hash marks.

On many CCC Qjets the choke coils have an anti tampering tab to locate and lock it to the factory position. The choke coils can't be rotated for custom settings unless you grind the lock tab off.

Many were riveted, just remove rivets and replace with screws.