Exhaust System Replacement LP1

Caution: Refer to Exhaust Service Caution in the Preface section.

Caution: Refer to Protective Goggles and Glove Caution in the Preface section.

1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
2. Disconnect the left and right bank 2 heated oxygen sensor (HO2S) electrical connectors (bank 1 shown, bank 2 similar).
3. Remove the HO2S wiring harnesses from the transmission case.



4. Remove the exhaust pipe nuts and separate the exhaust system from the catalytic converters.



5. Remove the muffler front hanger from the frame hanger rod.



6. Remove the tail pipe hangers from the muffler rods.



7. Remove the floor panel tunnel brace bolts.
8. Remove the floor panel tunnel brace from the floor panel.



9. With the aid of an assistant, lower the exhaust system.
10. Inspect and replace the exhaust system to catalytic converter seals if excessive wear or damage is noticed.



11. Remove the muffler rear hangers (2) from the muffler(s).
12. Remove the HO2S from the exhaust system. Refer to Heated Oxygen Sensor Replacement - Bank 1 Sensor 2 and Heated Oxygen Sensor Replacement - Bank 2 Sensor 2 .

1. Install the HO2S to the exhaust system. Refer to Heated Oxygen Sensor Replacement - Bank 1 Sensor 2 and Heated Oxygen Sensor Replacement - Bank 2 Sensor 2 .
2. Install the muffler rear hangers (2) to the muffler(s).

Notice: Refer to Exhaust System Inspection Notice in the Preface section.

Notice: Refer to Flex Decoupler Notice in the Preface section.




3. With the aid of an assistant, raise the exhaust system into position.
4. Install the exhaust system (muffler) nuts.



5. Install the muffler to the muffler rear hangers.



6. Install the muffler rear hanger to the hanger rod.

Notice: Refer to Fastener Notice in the Preface section.




7. Install the exhaust pipe nuts.

Tighten
Tighten the nuts to 22 N·m (16 lb ft).




8. Install the floor panel tunnel brace to the floor panel.
9. Install the floor panel tunnel brace bolts.

Tighten
Tighten the floor panel tunnel brace bolts to 25 N·m (18 lb ft).




10. Connect the left and right bank 2 HO2S electrical connectors (bank 1 shown, bank 2 similar).
11. Install the HO2S wiring harnesses to the transmission case.
12. Lower the vehicle.

Exhaust System Replacement LS6

Servicing of the muffler, resonator or pipe requires the replacement of the exhaust system as a complete one-piece unit.

Caution: Refer to Exhaust Service Caution in the Preface section.

Caution: Refer to Protective Goggles and Glove Caution in the Preface section.

1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
2. Remove the 2 bolts securing the floor panel tunnel brace to the floor panel.
3. Remove the floor panel tunnel brace from the floor panel.
4. Suitably support the exhaust system.
5. Remove the exhaust pipe nuts securing the exhaust pipes to the catalytic converters.



6. Pry the front exhaust hangers (1) free from the rear suspension hanger rods.



7. Apply a suitable lubricant to the tail pipe hanger rods in order to ease the removal of the tail pipe hangers (1).
8. Pry the tail pipe hangers (1) free from the tail pipe hanger rods.



9. With the aid of an assistant, lower the exhaust system.
10. Remove the catalytic converter seals. Do not reuse the seals.



11. While the exhaust system is on the floor complete the following:

11.1.

Apply a suitable lubricant to the exhaust pipe hanger rods (3) in order to ease the removal of the front exhaust hangers (2).

11.2.

Pull the front exhaust hangers (2) from the exhaust pipe hanger rods.

1. While the exhaust system is on the floor complete the following:

1.1.	Apply a soapy solution to the following in order to ease the installation of the hangers:

•	The inner diameter of the front exhaust hangers

•	The exhaust pipe hanger rods

•	The inner diameter of the tail pipe hangers

•	The tail pipe hanger rods

1.2.	Press the front exhaust hangers over the exhaust pipe hanger rods.

2. Place NEW seals on the catalytic converter flanges.

Notice: Refer to Exhaust System Inspection Notice in the Preface section.




3. With the aid of an assistant, raise the exhaust system into position, aligning the exhaust pipe flanges with the studs located in the rear of the catalytic converters.
4. Finger tighten the exhaust pipe nuts to the catalytic converter studs.



5. Press the tail pipe hangers (1) over the tail pipe hanger rods.



6. Press the front exhaust hangers (1) over the rear suspension hanger rods.

Notice: Refer to Fastener Notice in the Preface section.

7. Tighten the exhaust pipe nuts.

Tighten
Tighten the nuts to 30 N·m (22 lb ft).




8. Position the floor panel tunnel brace to the floor panel.
9. Install the 2 bolts securing the floor panel tunnel brace to the floor panel.

Tighten
Tighten the bolts to 25 N·m (18 lb ft).

10. Lower the vehicle.

Exhaust System Replacement LY7

Caution: Refer to Exhaust Service Caution in the Preface section.

Caution: Refer to Protective Goggles and Glove Caution in the Preface section.

1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
2. Disconnect the left and right bank 2 heated oxygen sensor (HO2S) electrical connectors (bank 1 shown, bank 2 similar).
3. Remove the HO2S wiring harnesses from the transmission case.



4. Remove the exhaust pipe nuts and separate the exhaust system from the catalytic converters.



5. Remove the left muffler front hanger from the frame hanger rod.



6. Remove the right muffler front hanger from the frame hanger rod.



7. Remove the mufflers from the muffler hanger rods.



8. Remove the floor panel tunnel brace bolts.
9. Remove the floor panel tunnel brace from the floor panel.



10. With the aid of an assistant, lower the exhaust system.
11. Inspect and replace the exhaust system to catalytic converter seals if excessive wear or damage is noticed.



12. Remove the muffler rear hangers (2) from the muffler(s).
13. Remove the HO2S from the exhaust system. Refer to Heated Oxygen Sensor Replacement - Bank 1 Sensor 2 and Heated Oxygen Sensor Replacement - Bank 2 Sensor 2 .

1. Install the HO2S to the exhaust system. Refer to Heated Oxygen Sensor Replacement - Bank 1 Sensor 2 and Heated Oxygen Sensor Replacement - Bank 2 Sensor 2 .
2. Install the muffler rear hangers (2) to the muffler(s).

Notice: Refer to Exhaust System Inspection Notice in the Preface section.

Notice: Refer to Flex Decoupler Notice in the Preface section.




3. With the aid of an assistant, raise the exhaust system into position.
4. Install the exhaust system (muffler) nuts.



5. Install the mufflers to the muffler rear hangers.



6. Install the right muffler front hanger to the frame hanger rod.



7. Install the left muffler front hanger to the frame hanger rod.

Notice: Refer to Fastener Notice in the Preface section.




8. Install the exhaust pipe nuts.

Tighten
Tighten the nuts to 22 N·m (16 lb ft).




9. Install the floor panel tunnel brace to the floor panel.
10. Install the floor panel tunnel brace bolts.

Tighten
Tighten the floor panel tunnel brace bolts to 25 N·m (18 lb ft).




11. Connect the left and right bank 2 HO2S electrical connectors (bank 1 shown, bank 2 similar).
12. Install the HO2S wiring harnesses to the transmission case.
13. Lower the vehicle.