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- LOW FREQUENCY ENGINE KNOCKING NOISE AT HOT IDLE
| Publication Date: September 8, 2010 |
| 2009-2010 Expedition, F-150, F-250, F-350 |
| 2009-2010 Navigator |
This article supersedes TSB 09-23-7 to update the vehicle model lines, Service Procedure and Service Labor Time Standards.
Some 2009-2010 F-150 and F-Super Duty 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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