Here is some more information on that particular tsb. I own a service shop and subscribe to all data. They receive tsb's from the manufacturers. The only thing that did not copy we're a couple of photographs. That tube is off of the intake and shaped a little like a "U". A boot is on the back of the hose. From the front of your vehicle, trace the air cleaner element back to the intake and you will see the hose. The back attaches to the intake.
^ DRIVEABILITY - 5.4L 2V - IDLE-AIR BYPASS FLOW
^ ENGINE - 5.4L 2V - IDLE-AIR BYPASS FLOW
^ NOISE - IDLE-AIR BYPASS FLOW
INDUCED WHISTLE - VEHICLES EQUIPPED WITH 5.4L 2V
1999-2002 E SERIES, EXPEDITION, F-150, SUPER DUTY F SERIES
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.
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.
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
OTHER APPLICABLE ARTICLES: NONE
Eligible Under The Provisions Of Bumper To Bumper Warranty Coverage And Emissions Warranty Coverage
BASIC PART NO. CODE
OASIS CODES: 497000, 702000, 702100