How Do You Adjust A Holley Carburetor That Is Running Rich. One way to tell for sure is by “reading” the spark plugs. Continue to make very slight.
Keep in mind there are other factors that could make her run rich. Then, start your car and let it warm up. Double checked the float levels, no gas coming out of the sight plugs unless you shake the car, the accelerator pump is set right, and i can't see any fuel dripping in the carb anywhere.
When it's at running temperature, find the 2 screws on your carburetor that adjust the air and fuel mixture. Locate the curb idle speed screw and the idle mixture screw; How do i know if my carburetor is running rich or lean?
The symptoms of running too rich or too lean are easy to see. Keep in mind there are other factors that could make her run rich. What you would want to start off wise is have about at least no less then 12 degrees initial timing and also if you have an aftermarket distributor with an adjustable vacuum advance canister you want to adjust it to give no more then 12 to 14 degrees on the vacuum advance and hook it up to full manifold so it will give your engine more timing at idle so you would have 12.
Vacuum gauge attached to the intake manifold. If it has a difficult time idling adjust the curb idle speed screw (clockwise) so that the engine won't shut off. To adjust your idle speed, find the idle mixture screw that limits the flow of fuel at idle.
The primary metering block is usually located closest to the front of the engine. To adjust your idle speed, find the idle mixture screw that limits the flow of fuel at idle. Start the motor, letting it warm up for about five minutes.3 remove the rubber vacuum hose from the vacuum port on the side of the carburetor.
Double checked the float levels, no gas coming out of the sight plugs unless you shake the car, the accelerator pump is set right, and i can't see any fuel dripping in the carb anywhere. Put a holley 1850 series carb (600 cfm vac secondaries elec choke, with 64 jets in the primaries). The idle mixture screws are 1 1/2 turns out.when i turn them all the way in the car will stall.