Check Valves

Testing Check Valve:

IN INTAKE MANIFOLD

1. Disconnect the air hose (air pump to air control valve) at the air pump.
2. Connect a tachometer to the engine.
3. Start the engine and disconnect the connector from the switching solenoid valve.
4. Increase the engine speed to 1,500 rpm and check for exhaust gas leakage at the air inlet fitting on the air control valve.
5. Replace the check valve if there is exhaust gas leakage.

Testing Check Valve:

INTAKE MANIFOLD TO CATALYTIC CONVERTER

1. Disconnect the air hose (intake manifold to catalytic converter) at the rear of the intake manifold.
2. Connect a tachometer to the engine.
3. Start the engine.
4. Place a finger over the air hose opening.
5. Increase the engine speed to 1,500 rpm and check for exhaust gas leakage from the air hose opening.
6. Replace the check valve, if there is exhaust gas leakage.