Whistle Noise from Engine Compartment at 1500-2000 RPM – 2015-2016 Ford F-Super Duty F-250, F-350

FORD:

2015-2016 F-250, F-350

ISSUE:

Some 2015-2016 F-Super Duty 250/350 vehicles equipped with a 6.2L engine and built on or before 8/21/2015 may exhibit a whistle noise from the engine compartment at 1500-2000 RPM.

This condition may be attributed to the intake manifold hardware.

ACTION:

Follow the Service Procedure steps to correct the condition.

SERVICE PROCEDURE

1. Using the Integrated Diagnostic Service (IDS) service tool or equivalent scan tool, check for any continuous memory diagnostic trouble codes (CMDTCs). Are any CMDTCs present?
   1. Yes – this article does not apply, refer to Powertrain Control/Emission Diagnosis (PC/ED) manual for normal diagnostics.
   2. No – proceed to Step 2.
2. Remove the front end accessory drive (FEAD) belt. Refer to Workshop Manual (WSM), Section 303-05.
3. Start the engine, increase the engine speed to 1500-2000 RPM. Is a whistle noise present from the intake manifold near the electronic throttle body (ETB)?
   1. No – this article does not apply. Refer to PC/ED manual for normal diagnostics.
   2. Yes – proceed to Step 4.
4. Replace the intake manifold. Refer to WSM, Section 303-01.
   1. Remove the evaporative emission (EVAP) canister purge valve from the original intake manifold and install it on the new intake manifold. Install new self-tapping screws and tighten to 10 Nm (89 lb-in). Refer to WSM, Section 303-13.

AL3Z-9424-G	Intake Manifold – Gasoline
AL3Z-9424-H	Intake Manifold – CNG
W506858-S437	Bolt – Evaporative Emission Canister Purge Valve (2 Req.)
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