Air Diverter Valve: Testing and Inspection

1. Check condition and routing of all lines, especially the signal line. All lines must be secure without crimps and not leaking.
2. Disconnect signal line at valve. A vacuum signal must be available with engine running.
3. With engine warmed up to operating temperature and carburetor at curb idle, no air should be escaping through the valve's vent. Manually open and quickly close the throttle; a momentary blast of air should discharge through the valve's vent for at least one second. Defective valve should be replaced.


CAUTION: Although sometimes similar in appearance, these valves are designed to meet particular requirements of various engines; therefore, be sure to install the correct valve for the engine being serviced.