Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

Choke

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PMD1969:

--- Quote from: Shark Racer on November 28, 2012, 05:13:00 PM ---Have you tested your choke pull off to be functional? The choke pull-off should open the choke as the engine turns over as it applies vacuum and pulls the flaps open a bit. There is an adjustment on the pull-off if it is tested to be functional.

Start by applying a vacuum to the pull off - it should hold vacuum and the pull-off will retract and open the choke flap when the engine is cold.

--- End quote ---

Some updates.  I used a MityVac to test the pull off.  It works well but the little hose was questionable so I replaced the hose.  I replaced the primary flap and started the car.  It ran like crap (same as before) and would not run unless in WOT.  As usual it would not run unless it started getting warm.  After it got warm I adjusted the little screw that is close to the choke pull off and the more that I turned the screw the faster the idle went up.

PMD1969:
more updates.

I have replaced all of the hoses to the carb and adjusted (bent) the arm that should hold the primary air flap open more.  It seems that the carb is flooding it self out in " choke mode " but when that immediate problem stops it starts to want to run right.  I backed the screw out at he choke pull off and got it down to a decent idle 800rpm.  Now that its warm I'll wait until is cools to tr another choke start.

ETA:   :o :o :o  All of the mounting bolts on the carb were loose !  The idle stop bracket wiggled when I went to adjust the stop so I started checking all of them.  Geez - I took a 1/2 wrench and genty tightened them all down.   :o :o :o :o

Cliff Ruggles:
Adjust the choke pull-off so the flap is open to the correct angle on cold starts.

Remove the secondary lock-out and roll pin from the airhorn.  For some reason it is keeping the flaps closed, I can see it in the pic and the choke appears to be off.....Cliff

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