Fuel System - Whistling Noise

Article No.
02-10-8

05/27/02

^ DRIVEABILITY - 5.4L 2V - IDLE-AIR BYPASS FLOW
INDUCED WHISTLE

^ ENGINE - 5.4L 2V - IDLE-AIR BYPASS FLOW
INDUCED WHISTLE

^ NOISE - IDLE-AIR BYPASS FLOW
INDUCED WHISTLE - VEHICLES EQUIPPED WITH 5.4L 2V
ENGINE ONLY

FORD:
1999-2002 E SERIES, EXPEDITION, F-150, SUPER DUTY F SERIES

ISSUE

Some vehicles equipped with the 5.4L 2V engine may exhibit a "whistling" noise from the formed nylon tube in the idle-air bypass flow circuit. This may be caused by air flow passing through the sharp bend radius of the original tube assembly.

ACTION

Remove and replace formed nylon tube with the Nipple And Hose Assembly 2L1Z-9W548-AA. This action will correct the sharp bend in the tube. Refer to the following Service Procedure for details.

SERVICE PROCEDURE





1. Remove the formed tube as shown (Figure 1).

2. Replace with Nipple And Hose Assembly with part 2L1Z-9W548-AA.





3. Connect nipple to the air-inlet zip tube and the free end connects to resonator as shown (Figure 2).

4. Ensure that there are no kinks in the rubber hose which could restrict air flow.





LABOR OPERATION CLAIMING CHART





PARTS BLOCK

OTHER APPLICABLE ARTICLES: NONE

WARRANTY STATUS:
Eligible Under The Provisions Of Bumper To Bumper Warranty Coverage And Emissions Warranty Coverage

DEALER CODING
CONDITION
BASIC PART NO. CODE
9H308 V3

OASIS CODES: 497000, 702000, 702100