The Corvair is a compact car sold by Chevrolet from 1960-1969. Cars from that era used carburetors to mix air with the gasoline for combustion prior to the invention of fuel-injection systems. Because air moves through the carburetor it is easy for this unit to become clogged with foreign matter. Regular cleaning of the carburetor to remove these accumulated airborne particles, along with frequent adjustment of the unit, helps the car run smoother and extends the life of the engine.
Use the hood-release lever on the Corvair and lift the hood up to access the carburetor. Remove the air filter by unscrewing the housing and pulling the air cartridge free.
Insert a flathead screwdriver into the idle mixture screw located underneath the air filter and turn it clockwise as far as it goes. Wait 10 seconds and then turn the screw counterclockwise 1 1/2 turns.
Locate the jet adjustment screw at the bottom of the carburetor's float bowl and turn it counterclockwise until it stops. Turn this screw back clockwise 1 1/2 turns to balance the idle mixture screw.
Replace the air filter with a new one by seating it into the housing. Screw the air filter cover back onto the frame securely to hold the filter in place.
Start the Corvair's engine and allow it to run for a few minutes. Slowly turn the idle mixture screw clockwise and listen for the engine to slow. Allow it to run for another minute. Turn the screw back counterclockwise a half-turn.
Run the engine for another two minutes. Close the hood and take it for a short drive. If the idle sound stays constant after driving it for approximately five minutes, the carburetor is balanced.
