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- LOW FREQUENCY ENGINE KNOCKING NOISE AT HOT IDLE
| Publication Date: November 11, 2009 |
| 2009-2010 Expedition, F-150 |
| 2009-2010 Navigator |
Some 2009-2010 F150 vehicles equipped with a 4.6L 3V or 5.4L 3V engine, Expedition and Navigator vehicles may exhibit a low frequency knocking noise from the engine at hot idle only. The noise is predominately heard from the right front wheel well area and/or the right hand (RH) engine cam cover. This noise may be generated from the RH variable camshaft timing (VCT) phaser assembly. This procedure was created to diagnose the RH VCT phaser assembly.
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