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.

Air Switching Valve:

AIR SWITCHING VALVE

1. Be sure air pump is pumping air.
2. Disconnect hose from air switching valve to check valve, at check valve.
3. Disconnect both vacuum hoses from air switching valve.
4. Start engine.
5. Connect manifold vacuum hose to pipe #1 of air switching valve, air should be discharged through hose to check valve.
6. Remove vacuum hose from pipe #1 and connect to pipe #2 of air switching valve, air should be diverted to air cleaner.
7. Replace if defective.

Vacuum Switching Valve:

VACUUM SWITCHING VALVE

1. Remove VSV.
2. Check that air flows freely from X to Y, and that Z is blocked.
3. Apply 12 volts DC. Check that air flows freely from Y to Z, and that X is blocked.
4. Replace if defective.

NOTE: When re-installing VSV, be sure vacuum hoses are connected properly to insure that AIR system will operate correctly.

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.