Catalytic Converter

Catalytic Converter - 6.2L

Removal

NOTE: Exhaust fasteners are of a torque prevailing design. Use only new fasteners with the same part number as the original. Torque values must be used as specified during reassembly to make sure of correct retention of exhaust components.

1. With the vehicle in NEUTRAL, position it on a hoist. For additional information, refer to Jacking and Lifting Service and Repair.

2. Disconnect the 2 Heated Oxygen Sensor (HO2S) and the 2 Catalyst Monitor Sensor (CMS) electrical connectors.

3. Remove the 2 exhaust Y-pipe with dual catalytic converter-to-resonator bolts.

4. Loosen the 2 exhaust Y-pipe with dual catalytic converter-to-resonator Torca(R) clamp nuts.

5. NOTE: LH exhaust Y-pipe-to-exhaust manifold flange shown, RH similar.

With the help of an assistant, remove the 4 exhaust Y-pipe-to-exhaust manifold flange nuts and the exhaust Y-pipe with dual catalytic converter assembly from the vehicle.

- Discard the nuts.





Installation

NOTE: Do not tighten any fasteners until all components are aligned.

1. NOTICE: Prior to installation, inspect the Heated Oxygen Sensor (HO2S) and the Catalyst Monitor Sensor (CMS) wiring harness for damage.

NOTE: LH exhaust Y-pipe-to-exhaust manifold flange shown, RH similar.

With the help of an assistant, position the exhaust Y-pipe with dual catalytic converter into the vehicle and loosely install 4 new exhaust Y-pipe-to-exhaust manifold flange nuts.





2. Loosely install the 2 exhaust Y-pipe with dual catalytic converter-to-resonator bolts.

3. Make sure the exhaust Y-pipe with dual catalytic converter-to-resonator Torca(R) clamp is positioned correctly on the resonator.

4. NOTE: Make sure the exhaust Y-pipe with dual catalytic converter is aligned to provide maximum clearance to adjacent parts.

To seat the LH exhaust Y-pipe-to-exhaust manifold nuts, tighten the nuts in the following sequence.

- Tighten the lower LH exhaust Y-pipe-to-exhaust manifold nut to 20 Nm (177 lb-in).

- Tighten the upper LH exhaust Y-pipe-to-exhaust manifold nut to 40 Nm (30 lb-ft).

- Tighten the lower LH exhaust Y-pipe-to-exhaust manifold nut to 40 Nm (30 lb-ft).





5. NOTE: Make sure the exhaust Y-pipe with dual catalytic converter is aligned to provide maximum clearance to adjacent parts.

To seat the RH exhaust Y-pipe-to-exhaust manifold nuts, tighten the nuts in the following sequence.

- Tighten the lower RH exhaust Y-pipe-to-exhaust manifold nut to 20 Nm (177 lb-in).

- Tighten the upper RH exhaust Y-pipe-to-exhaust manifold nut to 40 Nm (30 lb-ft).

- Tighten the lower RH exhaust Y-pipe-to-exhaust manifold nut to 40 Nm (30 lb-ft).





6. Tighten the 2 exhaust Y-pipe with dual catalytic converter-to-resonator bolts.
- Tighten to 40 Nm (30 lb-ft).

7. Tighten the 2 Torca(R) clamp nuts.
- Tighten to 48 Nm (35 lb-ft).

8. Connect the 2 Heated Oxygen Sensor (HO2S) and the 2 Catalyst Monitor Sensor (CMS) electrical connectors.