Hey Guys. I've been working on my Quadrajet for a couple of weeks now. I got it all cleaned out, new gaskets, and hooked back up and on the car. I started the car right up on the first few seconds. Ran a bit rough, but settled down to a nice idle and responded to pedel demands nicely. Looking closer, I noticed that the secondaries won't engage when they are needed. I mean I was cranking on the throttle by had to see if the four barrel would open. I'm not sure how the lock out works, I can't see what unlocks it. There isn't a spring or linkage that touches it. I've been looking at videos all day yesterday and this morning trying to figure it out on my own. The only thing that I can see is that the vac pull back is keeping the top blades closed. Its a painful learning process. I'd like to say that I'm pretty quick to figure out mechanics, but this one is kicking my butt!!! I really appreciate all the help I've gotten. Thanks guys. Matt

The throttles should open when the linkage is pushed far enough by the pedal.

The air valve will NEVER open without the engine under heavy load; i.e. accelerating the car. If you EVER see it open while just winging the throttle in the driveway, it will surely also have a HUUUUJJJJJJJE dose of the infamous "bog" under load.

.....if i remember it should be thermally controlled also

http://carburetor-manual.com/rochest...kout-a-38.html

There should be a small lever that locks them closed until the choke fully opens. See the picture. It is called the secondary lockout lever.