Originally Posted by Mac88
I know the purpose of a choke, and I've read a few posts and have a general idea how it works, but I'm still not quiet getting how to set it up. I have a Holley Street Avenger Carb (670), and I had to install a choke because when I bought the car, I guess the previous owner had removed it. Anyway, I have the choke installed. The notch on the black cap is centered on the index lines on the choke housing and the choke flap is completely closed. So, guess my first question is, at what point the flap should open completely. When I take my hand and manually engage the throttle, even with full throttle, the flap only opens about 1/4 of the way. I know I have to adjust the fast idle screw to about 1600, which I haven't been able to get my wrench on that screw yet. It's a pain. I guess my biggest concern is when should the flap open and how far should it open. I'm reading the Holley instructions, but I'm still a bit confused.
The way I have always set them is to do it cold, before starting the engine. Remove the air cleaner, loosen the screws and turn the "black cap" so the choke will close fairly firmly. Turn the black cap in the opposite direction until you just start to see the choke opening and tighten the screws. Start the engine and let it warm up. Verify that the choke is completely open when the engine is at operating temperature. If not, make a small adjustment to open it up. This is the way I have always done it and have had no problems.