How To Adjust A Quadrajet Carburetor. Chevrolet quadrajet carburetors would have a 0, 1, or even a 2. The quadrajet carburetor has two distinct and sepa rate design stages.
Replacing the mixture control solenoid is simple enough, and will pretty much conclude the fuel bowl service once it’s properly adjusted. The primary side of the carburetor (fuel inlet side) has two small bores. The quadrajet carburetor has two distinct and sepa rate design stages.
The next digit indicates the carburetor model. Sometimes you just can’t find the tool you need for proper adjustments. My edelbrock 1902 qjet has a screw in the base plate that adjusts the down position of the power piston to change how much rod taper is in the jets at part throttle.
The primary side of the carburetor (fuel inlet side) has two small bores. The number starts with either “70…” or “170…”. The next digit identifies the exact production year.
The rochester quadrajet uses an automatic choke system that is actually very good, if properly set up and adjusted. To change the mixture, the rods, metering jets or both need to be changed to get the right mixture. That may get rid of the flat spot when coming off idle.
You must establish a starting point and start counting from there. A 4 would mean it is for a buick, a 5 would mean oldsmobile, and pontiac carburetors usually have a 6 or 7. Screw the left idle screw into the carburetor until the engine starts to run rough.
First, check to make sure both idle mixture screws are adjusted equally. To adjust your idle speed, find the idle mixture screw that limits the flow of fuel at idle. When it's at running temperature, find the 2 screws on your carburetor that adjust the air and fuel mixture.