Carb Trouble, Need Help Please

[ray_mcavoy]

Welcome Nathan!

When you say:

When the Engine gets warmed up, the carb stays completely closed and the engine dies and will not start back up.

Am I correct in assuming you're talking about the choke staying completely closed?

If that's the case, you'll have to see what's keeping the choke from opening as the engine warms up. I think the factory setup for 74 was a divorced choke with a thermostatic coil mounted on the intake manifold crossover and connected to the carb with a short linkage rod. Make sure it's not missing any pieces and that the linkage moves freely.

Once you get the choke working properly, the Quadrajet carbs have two idle speed screws. The curb idle speed screw you mentioned only comes into play once the choke has fully opened. There's also a fast idle speed screw (in a somewhat hidden location on the passenger side near the choke linkage) that sets the idle speed when the choke is not fully open. This is the screw you'll need to adjust to bring down that "way too high" idle when the engine is cold.

[cjlinkster]

You may want to check to make sure that there is a thermostat in the engine; otherwise the engine may not get hot enough to expand the spring in the choke housing.

Does your choke pull off pull the choke plate open (1/4") upon the engine starting or does the choke plate remaining totally closed? The front pull off should open the choke plate once the engine starts. Use a vacuum pump to test the pull offs.

There are some good videos on youtube that will help you with the quadrajet.