Air Injection Pump: Testing and Inspection

Air Pump Diagnosis:

The air injection system and air injection pump is not completely noiseless. Under normal conditions, noise rises in pitch as engine speed increases. To determine if excessive noise is fault of air injection system, disconnect accessory drive belt and temporarily operate engine. Do not allow engine to overheat when operating without drive belt.

CAUTION: Do not attempt to lubricate the air injection pump. Oil in the pump will cause rapid deterioration and failure.