[Old'sCool]

Every so often with the OX66 motors you need to clean the O2 sensor, housing, and dogbone. The housing and dogbone are cleaned most effectively in a glass bead cabinet, the sensor business end soaked in ring-free. 2000 motor should have this. You may want to inspect the oil rod plastic swivel at the pump end. I found mine cracked. Cheap part and easy to replace. I understand if it fails the pump will default open.