Air Control Valve
- After ensuring air pump and all hoses are correct, check carburetor and air control valve attaching nuts for tightness. Warm engine to normal operating temperature. Stop engine and connect a tachometer.
- Disconnect air cleaner-to-air control valve hose at air cleaner. Place a finger over the hose opening. Increase the engine speed and make sure that air flows out when the engine speed is 1500-2500 RPM or higher. See Fig 1 .
- Run the engine at idling speed. Disconnect the vacuum sensing tube (from relief solenoid valve to pipe) at the pipe. Air should flow out from the air hose. Reconnect the vacuum sensing tube and the air hose.
- Disconnect the split air hose (from check valve to intake manifold) at the intake manifold. Place a finger over the port opening. Disconnect the vacuum sensing tube (from switching solenoid to pipe) at the pipe.
- Air should flow out from the port. Reconnect the vacuum sensing tube and split air hose. If air control valve does not respond as described, replace air control valve.