Some 2005-2013 Lincoln Navigator vehicles equipped with a 5.4L 3V engine may exhibit an intermittent rattle noise while driving from idle up to 1200 rpm with the engine at operating temperature. In severe cases, a rough idle and DTCs P0022, P0021, P0340 and/or P0341 may be stored in the PCM.
Replace the left and right variable cam timing (VCT) solenoids. Refer to workshop manual section 303. VCT solenoids are available as P/N 8L3Z-6M280-B. Replace gaskets as well.