Interesting comment from an online board
"Any Ford Truck with a 5.4L Engine The 5.4L 3-valve engines used in Ford Trucks from 2004 to 2010 develop camshaft phaser issues, especially when engines exceed the 100,000 mile mark. The first sig...
Forum Discussion
:) Hi, I have a four valve 5.4 L engine in my Navigator; I have about 123,000 miles and still running the original spark plugs with no problems at all with drivability.
