Tribute 2WD L4-2.5L (2009)
Muffler: All Technical Service Bulletins
Exhaust System - Metallic Exhaust Noise On Cold Start Up
Bulletin No: 01-002/10
Last Issued: 01/04/2010
Subject:
10-20 SECOND EXHAUST NOISE AFTER OVERNIGHT SOAK
APPLICABLE MODEL(S)/VINS
2009 Tribute 2.5L built on or before 09/30/2008
DESCRIPTION
Some vehicles may exhibit a metallic exhaust noise during first 10-20 seconds of operation during a cold start (engine off for 2 or more hours). The noise
decreases as the exhaust system warms up.
Customers having this concern should have their vehicle repaired using the following repair procedure.
REPAIR PROCEDURE
1. Is exhaust noise only audible during first 10-20 seconds of operation during a cold start (engine off for 2 or more hours)?
a. Yes - Proceed to Step 2.
b. No - Stop as procedure does not apply. Follow normal Noise, Vibration and Harshness (NVH) diagnostics per MS3 online or Workshop Manual
(section 02-01 NOISE, VIBRATION AND HARSHNESS (NVH) - DIAGNOSIS AND TESTING).
2. With the vehicle in neutral, position it on a hoist. Refer to MS3 online or Workshop Manual (section 00-00 LIFTING).
NOTE:
POSITION HOIST LIFT ARM CLEAR OF EXHAUST HEAT SHIELD.
3. With the exhaust system installed on vehicle, measure 3" (75 mm) from the end of the catalytic converter outlet weld and mark the pipe. Install hose
clamps to either side of mark. Using reciprocating saw, cut pipe between the clamps using clamps as a guide. (Figure 1).
4. Remove and discard the muffler portion of the catalytic converter and muffler assembly.
5. De-burr the cut edge of the catalytic converter outlet pipe. Using sandpaper or equivalent, clean the rust from the outside surface of the outlet pipe.
6. Remove and discard the underbody heat shield. If equipped, cut off the body stud for the old heat shield. Replace with new heat shield listed in parts
list. Reuse original heat shield fasteners and torque to 3 lb-ft (4 Nm).
7. Loosely install the U-bolt onto the inlet pipe of the new muffler/resonator assembly. Install in vehicle by assembling the resonator inlet pipe over the
catalytic converter outlet pipe. Install hangers in rubber insulators
NOTE:
