F 350 2WD Super Duty V8-5.4L SOHC VIN L (2002)
Auxiliary Air Valve (Idle Speed): All Technical Service Bulletins
Fuel System - Whistling Noise
Article No.
02-10-8
05/27/02
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DRIVEABILITY - 5.4L 2V - IDLE-AIR BYPASS FLOW
INDUCED WHISTLE
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ENGINE - 5.4L 2V - IDLE-AIR BYPASS FLOW
INDUCED WHISTLE
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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.
