Catalytic Converter Replacement (Single Exhaust - 4.3L, 4.8L and 5.3L)

Catalytic Converter Replacement (Single Exhaust - 4.3L, 4.8L and 5.3L)

Removal Procedure




1. Raise the vehicle. Refer to Vehicle Lifting.
2. Disconnect the heated oxygen sensor (HO2S) electrical connections from catalytic converter pipe.
3. Remove the exhaust hanger bolts and hanger from the transmission.
4. Remove the nuts and the seals retaining the catalytic converter pipe to the exhaust manifolds.





Caution: Refer to Exhaust Service Caution.

Caution: Refer to Protective Goggles and Gloves Caution.

5. Remove the flange nuts from the catalytic pipe to the muffler.
6. Remove the catalytic converter from the vehicle.
7. Remove the oxygen sensors as necessary. Refer to Heated Oxygen Sensor Replacement - Bank 1 Sensor 1.

Installation Procedure




1. Install the oxygen sensors as necessary. Refer to Heated Oxygen Sensor Replacement - Bank 1 Sensor 1.
2. Position the catalytic pipe to the vehicle.
3. Install the retaining nuts to the front of the muffler.
Do not tighten the nuts.

Notice: Refer to Fastener Notice.

4. Install the new seals, the nuts and the exhaust pipe flange to exhaust manifold.

* Tighten the exhaust pipe flange to exhaust manifold nuts to 65 N.m (48 lb ft).
* Tighten the catalytic converter to muffler retaining nuts to 48 N.m (35 lb ft).




5. Connect the HO2S electrical connections.
6. Install the exhaust hanger and bolts to the transmission.

Tighten the bolts to 17 N.m (13 lb ft).

Notice: Refer to Exhaust System Inspection Notice.

7. Verify the exhaust system for proper clearance and the alignment of all components.
8. Lower the vehicle.