Some vehicle may exhibit a tapping noise from the engine during idling; etc., and synchronized to the...

Bulletin number

01-002-21-3767a

Component

Engine and engine cooling

Summary

Some vehicle may exhibit a tapping noise from the engine during idling; etc., and synchronized to the engine rpm. The tapping noise may be caused by the switchable hydraulic lash adjuster (HLA), which may not work properly due to air bubbles accumulated in the oil passage in it. To eliminate this concern, the switchable HLA has been modified for increased oil supply to reduce air bubbles in the oil passage. NOTE: The switchable HLA can be pressed down with a finger if air bubbles have accumulated in it.

Owners of these vehicles have filed 557 complaints in the engine category.