Air Injection: Testing and Inspection

Air Injection Reactor System Testing:

AIR INJECTION REACTOR SYSTEM TESTING

1. With engine idling at normal operating temperature, check that secondary air is diverted from silencer located on air cleaner.
2. Disconnect vacuum hoses "X" and "Z" from air switching valve (ASV). Disconnect hose at check valve ("1") and plug check valve opening.
3. Disconnect vacuum hose "Y" and connect hose to ASV vacuum hose port "X." Check that secondary air passes from ASV at check valve hose "B." Replace ASV if defective.

Vacuum Switching Valve:

VACUUM SWITCHING VALVE (VSV) TESTING

1. Remove VSV electrical connector and apply battery voltage across VSV terminals. Check that air does not flow freely through ports "X" and "Y" and does flow freely through ports "Y" and "Z."
2. Disconnect battery voltage. Check that air flows freely through ports "X" and "Y" and does not flow freely through ports "Y" and "Z."
3. Replace VSV if defective.


AIR INJECTION PUMP INSPECTION

Check the air pump for abnormal noise or broken components and replace if found defective. The pump is not serviceable and must be replaced as a unit.

Check Valve:

CHECK VALVE TESTING

Remove check valve from the air manifold. Test for leakage by blowing air into the valve from the air pump side and from the air manifold side. A good valve will only pass air from the pump side. The valve is defective if air passes from the manifold side and should be replaced. A small amount of air leakage may be overlooked.

AIR HOSE AND INJECTION PIPE INSPECTION

Check around the air manifold for air leakage with the engine running at 2000 rpm. If air is leaking from the nozzle sleeve nuts, tighten them.
Check and replace hoses if found to be fatigued or cracked. Also check hose joints and clamps. Be sure hoses are not rubbing against adjacent components.