LOW FREQUENCY ENGINE KNOCKING NOISE AT HOT IDLE
FORD: 2009-2010 Expedition, F-150 LINCOLN: 2009-2010 Navigator
ISSUE
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.
ACTION
Follow the Service Procedure steps to correct the condition.
SERVICE PROCEDURE
The Integrated Diagnostic System (IDS) tests were developed specifically for the vehicles and Power Control Module (PCM) strategies for these vehicles.
Per Workshop Manual (WSM), Powertrain Controls and Emissions Diagnostics (PC/ED) and Scheduled Maintenance Guide, review customer service history for use of any aftermarket oil filters.
1. Check for possible diagnostic trouble codes (DTCs).
a. No DTCs present, proceed to Step 2.
b. If DTCs are present, discontinue with this procedure and refer to the PC/ED manual for diagnostics. Download File PDF
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