K 2500 Truck 4WD V6-262 4.3L VIN Z (1992)
Air Injection Pump: Testing and Inspection
Inspection:
1.
Remove hose from A.I.R. Injection Manifold Check Valve prior to starting engine. Start engine and accelerate to approximately 1500 RPM and
observe air flow from hose. If air flow increases as the engine RPM increases the air pump is OK. If not proceed as follows:
2.
Check to make sure air pump is not seized.
3.
Check for proper drive belt tension.
4.
Check air pump for leaking pressure relief valve. Air leakage may be heard from this valve with engine running.
5.
Check hoses, tubes and connections for proper routing and no leakage.
6.
Check air injection pump for proper mounting.
For further diagnosis of the AIR system, refer to AIR MANAGEMENT CHECK.
