Air Injection: Testing and Inspection

SYSTEM OPERATIONAL CHECK

With the engine cold:
1. Disconnect AIR hose at check valve and at air cleaner.
2. Start engine.
3. Rev engine by momentarily snapping the throttle wide open and then releasing.
4. While engine is reving "up" air should be discharging from hose to check valve.
5. When engine slows back to idle, air should discharge form hose to check valve for a few seconds, then switch to the air cleaner.



AIR PUMP

1. Disconnect hose from air pump to air switching valve, at switching valve.
2. Start engine.
3. With engine running and pump turning, air should be discharged from hose.
4. Check for abnormal noise from pump, replace if defective.

NOTE: Some noise from pump is normal. If pump discharges air, do not replace unless noise is excessive.


ELECTRIC AIR CONTROL VALVE

1. Disconnect hose from electric air control valve to check valve, at check valve.
2. Disconnect hose from air pump to electric air control valve, at pump.
3. Blow into hose from pump, air should be directed to air cleaner.
4. Connect vacuum pump to control vacuum port of electric air control valve.
5. Key "on" engine "off", ground diagnostic test terminal (this will energize the electric air control valve solenoid).
6. Blow into hose from pump, air should be directed to the check valve.
7. Apply 16"Hg vacuum (400 mmHg vacuum) to the control vacuum port while solenoid is energized, air should be directed to the air cleaner.
8. Replace if defective.

Check Valve:

CHECK VALVE

1. Disconnect AIR hose at check valve.
2. Start engine, no exhaust should be heard from check valve.

OR

Remove check valve from air manifold. Test it for leakage by blowing air into the valve from the air pump side and from the exhaust side. If check valve is OK, air will pass through the valve from the air pump side only. A very small amount or air passing through from the exhaust side is allowable.