A ticking noise may be noted from the engine caused by one or more stuck or collapsed valve lash adjusters. The repair involves inspecting and replacing lash adjusters as necessary.Google+
Car Problem Reports
Lincoln Mark LT Ticking Noise From Engine
Lincoln Mark LT Problem
Engine Affected: 6 Cylinder
Average Mileage: 84,000 mi (45,000 mi - 150,000 mi)
I have the same clicking problem. I was told by the dealer that there is no fix but not hurting the engine (do not believe). I was told by an owner of a Lincoln Navigator that had the same problem and told the same thing b Ford but went to another service center and they fixed it by replacing the 7 and 8 plug. No more ticking. I think I need to try this.
5.4L engine has ticking sound and has gotten very louder lately. Now truck has started loosing power and idle at slower than normal RPM. Now yet can get it repaired under warrant or even get the dealer to acknowledge there's a problem.
Visitor, 2006 Lincoln Mark LT, 6 Cylinder, 60,000 mi
klacking noise .... truck sounds like a diesel