Nissan Armada knocking noise from front motor and humming sound during cold start on Nissan Armada

Some Nissan Armada owners report experiencing a knocking noise from the front motor, which may be linked to several underlying issues such as low oil levels, ignition problems, timing issues, or faulty rod bearings and knock sensors. Additionally, a humming sound during cold starts has been noted, which could indicate that the timing chain is tapping against the front cover of the motor. Owners have also described various noises, including clicking and thumping, particularly when the engine is warm and idling, suggesting potential engine compartment issues. Furthermore, those with higher mileage vehicles may experience piston slap, characterized by a distinct clacking sound during cold starts. It is recommended that owners seek a professional mechanic's inspection to accurately diagnose and address these concerns.