Secondaries won\'t open on my Quadrajet, help! The Secondaries on my 84 Quadrajet are not opening. I jammed a screw into the slider so they could not open and sure enough ti felt exactly the same as without that screw there. Anyone got ideas? My vaccum source is that port right next to the brake vaccum on the back of the carb. I believe thats how the emissions chart shows it. Gonna get a carb off an 83 tomorrow rebuild it and slap it on.