Installation Procedure

WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Install the exhaust manifold pipe seal(s).
Raise the catalytic converter or exhaust manifold pipe using the adjustable jackstands.
NOTE: Refer to FASTENER NOTICE in Cautions and Notices.
If equipped with a 6.0L or 8.1L engine, perform the following:
1. Install the exhaust hanger mounting bracket bolts.
2. Install the left exhaust manifold pipe nuts.
Tighten
- Tighten the bolts to 12 N.m (106 lb in).
- Tighten the nuts to 50 N.m (39 lb ft).
Fig 1: Installing Left Exhaust Manifold Pipe, Seals & Nuts (6.0L & 8.1L)
Courtesy of GENERAL MOTORS CORP.
If equipped with a 6.0L or 8.1L engine, install the right exhaust manifold pipe nuts.
Tighten

Tighten the nuts to 50 N.m (39 lb ft).

Fig 2: Installing Right Exhaust Manifold Pipe Nuts (6.0L & 8.1L)
Courtesy of GENERAL MOTORS CORP.
If equipped with a 4.3L, 4.8L, or 5.3L engine, install the right exhaust manifold pipe nuts.

Fig 3: Installing Right Exhaust Manifold Pipe Nuts (4.3L, 4.8L & 5.3L)
Courtesy of GENERAL MOTORS CORP.
If equipped with a 4.3L, 4.8L, or 5.3L engine, install the left exhaust manifold pipe nuts.
Tighten

Tighten the nuts to 50 N.m (39 lb ft).

Fig 4: Installing Left Exhaust Manifold Pipe Nuts (4.3L, 4.8L & 5.3L)
Courtesy of GENERAL MOTORS CORP.
If equipped with a 6.0L or 8.1L engine, perform the following:
1. Connect the oxygen sensor electrical connector (1).
2. Connect the CPA retainer.
Remove the adjustable jackstands from catalytic converter or exhaust manifold pipe.

Fig 5: Connecting Oxygen Sensor Electrical Connector & CPA Retainer (6.0L & 8.1L)
Courtesy of GENERAL MOTORS CORP.
If equipped with a 4.3L, 4.8L, or 5.3L engine, perform the following:
1. Connect the oxygen sensor electrical connector (1).
2. Connect the CPA retainer.
3. Clip the oxygen sensor electrical connector to the hose clip.
Fig 6: Connecting Oxygen Sensor Electrical Connector, CPA Retainer & Clip (4.3L, 4.8L & 5.3L)
Courtesy of GENERAL MOTORS CORP.
If equipped with a 4.3L, 4.8L, or 5.3L engine, perform the following:
1. Connect the forward oxygen sensor electrical connector.
2. Connect the CPA retainer.
3. Install the clip around the engine harness and the oxygen sensor pigtail.
Lower the vehicle.

Fig 7: Connecting Forward Oxygen Sensor Electrical Connector, CPA Retainer & Clip (4.3L, 4.8L & 5.3L)
Courtesy of GENERAL MOTORS CORP.