I have loud valve noise after the car has been idling for a few minutes. What can I do about it? Check your oil level!
If your oil level is OK, you probably have failing oil pressure valves. There is one oil pressure valve in each head that can
be accessed by removing the valve cover. These valves keep oil going to the hydraulic lifters at a constant pressure. In the event
of a failure of one of these valves, all of the lifters on that side of the engine may have low or no oil pressure. This is a
Bad Thing which should be taken care of quickly.