Air Injection: Testing and Inspection

SYSTEM OPERATIONAL CHECK

With the engine cold:
1. Disconnect air hose at check valve.
2. Start engine and run at part throttle.
3. Pump should turn on and air should be discharging through hose. Exhaust should NOT escape through check valve.
4. Return to idle, air should be diverted to air cleaner after a few seconds.
5. Warm engine up, air pump should turn off when engine reaches operating temp.

Electric AIR Pump:

AIR PUMP (ELECTRIC)

1. Disconnect electrical connector at AIR pump.
2. Apply 12 volts to pump connector.
3. Check to see that pump motor turns.
4. Check to see that air is drawn in at A, and discharged at B (see diagram).
5. If motor does not turn or turns but does not pump air, replace pump.

Air Switching Valve:

AIR SWITCHING VALVE

1. Disconnect hose from air pump to air switching valve, at pump.
2. Disconnect hose from air switching valve to check valve, at check valve.
3. Blow into hose from air pump, air should be directed to the air cleaner.
4. Connect vacuum pump to control vacuum port on air switching valve, and apply approx. 100 mmHg vacuum (4"Hg vacuum).
5. Again blow into hose from air pump, air should be directed to the check valve.
6. Replace if defective.

Vacuum Switching Valve:

VACUUM SWITCHING VALVE

1. Remove VSV.
2. Connect vacuum pump to port B.
3. Block port A with finger tip and apply vacuum to port B. No vacuum should be felt at port A, and port B should be vented to the atmosphere (does not hold vacuum).
4. Energize solenoid by applying 12 volts DC.
5. Block port A with finger tip and apply vacuum to port B. You should feel vacuum at port A and valve should hold vacuum until port A is opened.
6. Replace if defective.

NOTE: When re-installing VSV, be sure port B is connected to device and port A is connected to vacuum source. If connected improperly, a vacuum leak will result.

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.