squealing air sound
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squealing air sound
I got this 04 1 ton with the 5.4l. At a certain throttle position i can hear a squealing, hissing, whistling sorta sound. If i ease off the throttle a bit it goes away, and if i open it a bit it goes away. Il hear it on the highway at about 6o mph, and any other speed with the throttle opened at that position. anyone heard of this before?
ryan
ryan
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From: Allen, Tx
Nothing to worry about. Even with the newer assembly described below (2003 revision), it still does it.
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.
PART NUMBER PART NAME
2L1Z-9W548-AA Nipple And Hose Assembly
DEALER CODING
BASIC PART NO. CONDITION CODE
9H308 V3
OASIS CODES:
497000, 702000, 702100
SERVICE PROCEDURE
Remove the formed tube as shown ( Figure 1 ).
Replace with Nipple And Hose Assembly with part 2L1Z-9W548-AA.
Connect nipple to the air-inlet zip tube and the free end connects to resonator as shown ( Figure 2 ).
Ensure that there are no kinks in the rubber hose which could restrict air flow.
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.
PART NUMBER PART NAME
2L1Z-9W548-AA Nipple And Hose Assembly
DEALER CODING
BASIC PART NO. CONDITION CODE
9H308 V3
OASIS CODES:
497000, 702000, 702100
SERVICE PROCEDURE
Remove the formed tube as shown ( Figure 1 ).
Replace with Nipple And Hose Assembly with part 2L1Z-9W548-AA.
Connect nipple to the air-inlet zip tube and the free end connects to resonator as shown ( Figure 2 ).
Ensure that there are no kinks in the rubber hose which could restrict air flow.
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