Help Help Help I have a 1973 455 out of a Buick Elctra 225. I have taken this engine and placed it in a 1975 Cutlass Supreme and I belive I am having Vacuume issues. Does ANYONE have any diagrams or pics of the vacuum routing on this engine with the Q-jet 4 B Carb ? Any and all help is much appeciated. I have a Very Very Bad bogging issue. when I romp on it......SOMETIMES it will smoke the tires and at other times the car just about dies. Works flawlessly every time if I SLOWLY push on the accelerator. :rant:
A bogging condition on a Q-jet is usually due to a malfunctioning air valves. The airvalves cover the top of the secondary bores on the Q-jet. Take the air cleaner off. With the engine off, push the airvalves in with your finger, then let go. The airvalves should spring back to their original condition. If they don't spring back, they may be gummed up, or the spring may require adjustment. As you push the airvalves in, the secondary rod hanger should lift the secondary rods up. Now start the engine. With the engine at an idle, again try to push the air valves in. You should not be able to. The front vacuum break has a link that should hold them closed. If you can push the air valves in, either the vacuum break is defective, or the link is missing. Those are the most common reasons for a bog. Check for a vacuum leak around the carburetor gasket. Check the vacuum advance cannister to make sure it is working. What is your timing?
