Explorer 2WD V6-245 4.0L (1994)
Muffler: All Technical Service Bulletins
Exhaust System - Whistle Noise On Acceleration
Article No.
94-23-17
11/14/94
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EXHAUST SYSTEM - "WHISTLE" NOISE ON ACCELERATION - VEHICLES WITH 4.0L ENGINES BUILT 12/7/93 THROUGH 12/31/93
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NOISE - "WHISTLE" ON ACCELERATION FROM EXHAUST SYSTEM - VEHICLES WITH 4.0L ENGINES BUILT 12/7/93 THROUGH
12/31/93
LIGHT TRUCK:
1994 EXPLORER, RANGER
ISSUE:
Some vehicles may exhibit a high pitched "whistle" noise coming from the exhaust once the vehicle is warmed up. This may be caused by a weld skip on
the internals of the muffler. As the vehicle warms up, the weld skip opens up and allows air to travel through at high speeds resulting in the whistle.
ACTION:
Replace the muffler and tailpipe assembly with a new assembly built outside of the build dates listed. The new assemblies will not have the weld skip.
Refer to the following service procedure.
SERVICE PROCEDURE
1.
Raise the vehicle by the frame allowing the rear suspension to hang freely.
2.
Remove the muffler and tailpipe assembly.
a.
Remove the spring bolt assemblies.
b.
Unhook the tailpipe from the rear hanger insulator.
c.
Unhook the muffler body from the hanger insulator.
d.
Remove the muffler and tailpipe assembly.
3.
Inspect the inlet gasket and reuse if it is not damaged. Replace if necessary.
4.
Install the correct muffler and tailpipe assembly.
a.
Install the muffler hanger to insulator.
b.
Install the tailpipe hanger to insulator.
c.
Install the spring bolt assemblies.
d.
Inspect the exhaust system for proper alignment and for possible contact with any part of the vehicle. Adjust as necessary.
e.
Torque spring bolts to 25-35 N-m (18-26 lb.ft.).
5.
Start the engine and check for leaks.
Parts Block
OTHER APPLICABLE ARTICLES: NONE
WARRANTY STATUS:
