Buick Enclave: Repair Instructions

EXHAUST MANIFOLD REPLACEMENT - LEFT SIDE

Removal Procedure

WARNING: Refer to Exhaust Service Warning.

WARNING: Refer to Protective Goggles and Glove Warning.

1. Remove the exhaust manifold heat shield. Refer to Exhaust Manifold Heat Shield Replacement - Left Side.

Fig. 1: Identifying Left Side Exhaust Manifold Bolts

2. Remove the oil level indicator. Refer to Oil Level Indicator Tube Replacement.

3. Remove the catalytic converter. Refer to Catalytic Converter Replacement - Left Side.

4. Remove the exhaust manifold bolts (1).

5. Remove the exhaust manifold and gasket. Discard the gasket.

NOTE: Do not reuse the gasket.

6. Remove the heated oxygen sensor (1) from the exhaust manifold.

Fig. 2: Identifying Heated Oxygen Sensors & Exhaust Manifold

Installation Procedure

NOTE: A special anti-seize compound is used in the HO2S threads. The compound consists of liquid graphite and glass beads. The graphite tends to burn away, but the glass beads remain, making the sensor easier to remove. New or service replacement sensors have the compound applied to the threads. If the sensor is removed from an exhaust component and if for any reason the sensor is to be reinstalled, the threads must have anti-seize compound applied before the reinstallation.

1. If reinstalling the old sensor, coat the threads with anti-seize compound GM P/N 12377953 or equivalent.

Fig. 3: Identifying Heated Oxygen Sensors & Exhaust Manifold

2. Install the HO2S (1) to the exhaust manifold.

CAUTION: Refer to Fastener Caution.

Tighten

• Tighten the sensor to 42 N.m (31 lb ft).

3. Install one exhaust manifold bolt (1) to the exhaust manifold.

Fig. 4: Identifying Left Side Exhaust Manifold Bolts

4. Install the NEW exhaust manifold gasket onto the exhaust manifold and bolt.

5. Install the exhaust manifold (with gasket) to the cylinder head and the catalytic converter.

6. Install the remaining exhaust manifold bolts.

Tighten

• Tighten the bolts to 20 N.m (15 lb ft).

7. Install the catalytic converter. Refer to Catalytic Converter Replacement - Left Side.

8. Install the oil level indicator. Refer to Oil Level Indicator Tube Replacement.

9. Install the exhaust manifold heat shield. Refer to Exhaust Manifold Heat Shield Replacement - Left Side.

EXHAUST MANIFOLD REPLACEMENT - RIGHT SIDE

Removal Procedure

WARNING: Refer to Exhaust Service Warning.

WARNING: Refer to Protective Goggles and Glove Warning.

1. Remove the catalytic converter. Refer to Catalytic Converter Replacement - Right Side.

Fig. 5: Identifying Exhaust Manifold Bolts

2. Remove the exhaust manifold heat shield. Refer to Exhaust Manifold Heat Shield Replacement - Right Side.

3. Remove the exhaust manifold bolts (1).

4. Remove the exhaust manifold and gasket out from vehicle. Discard the gasket.

NOTE: Do not reuse the gasket.

Installation Procedure

1. Install one exhaust manifold bolt (1) to the exhaust manifold.

Fig. 6: Identifying Exhaust Manifold Bolts

2. Install the NEW exhaust manifold gasket onto the cylinder head and bolt.

3. Install the exhaust manifold (with gasket) to the catalytic converter and the cylinder head.

4. Install the exhaust manifold bolts.

CAUTION: Refer to Fastener Caution.

Tighten

• Tighten the bolts to 20 N.m (15 lb ft).

5. Install the exhaust manifold heat shield. Refer to Exhaust Manifold Heat Shield Replacement - Right Side.

6. Install the catalytic converter. Refer to Catalytic Converter Replacement - Right Side.

CATALYTIC CONVERTER REPLACEMENT - LEFT SIDE

Removal Procedure

WARNING: Refer to Exhaust Service Warning.

WARNING: Refer to Protective Goggles and Glove Warning.

1. Remove the exhaust manifold heat shield. Refer to Exhaust Manifold Heat Shield Replacement - Left Side.

Fig. 7: Identifying Catalytic Converter Bolts

2. Remove the catalytic converter to exhaust manifold nuts (1).

3. Remove the exhaust flexible pipe. Refer to Exhaust Flexible Pipe Replacement.

4. Remove the catalytic converter brace bolt (2).

Fig. 8: Identifying Catalytic Converter Brace Bolt

5. Remove the catalytic converter from the exhaust manifold.

6. Remove and discard the catalytic converter to exhaust manifold seal (1).

Installation Procedure

1. Install a NEW exhaust manifold seal (1) onto the catalytic converter.

Fig. 9: Identifying Catalytic Converter Brace Bolt

2. Install the catalytic converter to the exhaust manifold.

3. Install the catalytic converter brace bolt (2).

CAUTION: Refer to Fastener Caution.

Tighten

• Tighten the bolt to 50 N.m (37 lb ft).

4. Install the exhaust flexible pipe. Refer to Exhaust Flexible Pipe Replacement.

Fig. 10: Identifying Catalytic Converter Bolts

5. Install the catalytic converter to exhaust manifold nuts (1).

Tighten

• Tighten the nuts to 50 N.m (37 lb ft).

6. Install the exhaust manifold heat shield. Refer to Exhaust Manifold Heat Shield Replacement - Left Side.

CATALYTIC CONVERTER REPLACEMENT - RIGHT SIDE

Removal Procedure

WARNING: Refer to Exhaust Service Warning.

WARNING: Refer to Protective Goggles and Glove Warning.

1. If equipped with all wheel drive (AWD), remove the transfer case. Refer to Transfer Case Assembly Replacement.

2. Remove the exhaust flexible pipe. Refer to Exhaust Flexible Pipe Replacement.

Fig. 11: Identifying Catalytic Converter To Exhaust Manifold Nuts

3. Remove the catalytic converter to exhaust manifold nuts (2).

4. Remove the catalytic converter from the exhaust manifold.

5. Remove and discard the catalytic converter to exhaust manifold seal (1).

Installation Procedure

1. Install a NEW catalytic converter to exhaust manifold seal (1) onto the catalytic converter.

Fig. 12: Identifying Catalytic Converter To Exhaust Manifold Nuts

2. Install the catalytic converter to the exhaust manifold.

3. Install the catalytic converter to exhaust manifold nuts (2).

CAUTION: Refer to Fastener Caution.

Tighten

• Tighten the nuts to 50 N.m (37 lb ft).

4. If equipped with all wheel drive (AWD), install the transfer case. Refer to Transfer Case Assembly Replacement.

5. Install the exhaust flexible pipe. Refer to Exhaust Flexible Pipe Replacement.

THREE-WAY CATALYTIC CONVERTER REPLACEMENT (LLT)

Fig. 13: View Of Three-Way Catalytic Converter (With LLT)

Three-Way Catalytic Converter Replacement (LLT)

EXHAUST MUFFLER REPLACEMENT (NB5)

Removal Procedure

1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle.

2. Remove the three way catalytic converter to muffler pipe nuts (1).

Fig. 14: Identifying Three Way Catalytic Converter-To-Muffler Pipe Nuts

3. With the aid of an assistant, separate the rubber insulators from the exhaust underbody hangers (1).

Fig. 15: Identifying Exhaust Underbody Hangers

4. With the aid of an assistant, remove the muffler assembly from exhaust flexible pipe and the vehicle.

Installation Procedure

1. With the aid of an assistant, install the muffler assembly to the vehicle and the exhaust flexible pipe.

Fig. 16: Identifying Exhaust Underbody Hangers

2. With the aid of an assistant, install the rubber insulators to the exhaust underbody hangers (1).

3. Install the three way catalytic converter to muffler piper nuts (1) and tighten to 50 N.m (37 lb ft).

Fig. 17: Identifying Three Way Catalytic Converter-To-Muffler Pipe Nuts

4. Lower the vehicle.

EXHAUST MUFFLER REPLACEMENT (NEA/NED OR N10)

Removal Procedure

1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle.

2. Remove the three way catalytic converter to muffler pipe nuts (1).

Fig. 18: Identifying Three Way Catalytic Converter-To-Muffler Pipe Nuts

3. With the aid of an assistant, separate the rubber insulators from the exhaust underbody hangers (1, 2 and 3).

Fig. 19: Identifying Exhaust Underbody Hangers

4. With the aid of an assistant, remove the muffler assembly from exhaust flexible pipe and the vehicle.

Installation Procedure

1. With the aid of an assistant, install the muffler assembly to the vehicle and the exhaust flexible pipe.

Fig. 20: Identifying Exhaust Underbody Hangers

2. With the aid of an assistant, install the rubber insulators to the exhaust underbody hangers (1, 2 and 3).

3. Install the three way catalytic converter to muffler pipe nuts (1) and tighten to 50 N.m (37 lb ft).

Fig. 21: Identifying Three Way Catalytic Converter-To-Muffler Pipe Nuts

4. Lower the vehicle.

EXHAUST FLEXIBLE PIPE REPLACEMENT

Fig. 22: Identifying Exhaust Flexible Pipe

Exhaust Flexible Pipe Replacement

EXHAUST MANIFOLD LOWER HEAT SHIELD REPLACEMENT

Removal Procedure

1. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle.

Fig. 23: Identifying Exhaust Manifold Lower Heat Shield Bolts

2. Remove the exhaust manifold lower heat shield bolts (1, 2).

3. Remove the exhaust manifold lower heat shield.

Installation Procedure

1. Position the exhaust manifold lower heat shield to the engine.

Fig. 24: Identifying Exhaust Manifold Lower Heat Shield Bolts

2. Install the exhaust manifold lower heat shield bolts (1, 2). Tighten bolt (1) to 10 N.m (89 lb in) and tighten bolt (2) to 50 N.m (37 lb ft).

CAUTION: Refer to Fastener Caution.

3. Lower the vehicle.

EXHAUST MANIFOLD HEAT SHIELD REPLACEMENT - RIGHT SIDE

Removal Procedure

WARNING: Refer to Protective Goggles and Glove Warning.

WARNING: Refer to Exhaust Service Warning.

1. Remove the heated oxygen sensor (HO2S). Refer to Heated Oxygen Sensor Replacement - Bank 1 Sensor 1.

Fig. 25: Identifying Exhaust Manifold Heat Shield Bolts - Right Side

2. Remove the exhaust flexible pipe. Refer to Exhaust Flexible Pipe Replacement.

3. Remove the exhaust manifold heat shield bolts (1).

4. Remove the exhaust manifold heat shield.

Installation Procedure

1. Install the exhaust manifold heat shield.

Fig. 26: Identifying Exhaust Manifold Heat Shield Bolts - Right Side

2. Install the exhaust manifold heat shield bolts (1) and tighten to 10 N.m (89 lb in).

CAUTION: Refer to Fastener Caution.

3. Install the exhaust flexible pipe. Refer to Exhaust Flexible Pipe Replacement.

4. Install the HO2S. Refer to Heated Oxygen Sensor Replacement - Bank 1 Sensor 1.

EXHAUST MANIFOLD HEAT SHIELD REPLACEMENT - LEFT SIDE

Removal Procedure

WARNING: Refer to Protective Goggles and Glove Warning.

WARNING: Refer to Exhaust Service Warning.

1. Remove the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement.

Fig. 27: Identifying Engine Wiring Harness Electrical Connector

2. Disconnect the engine wiring harness electrical connector (2) from the heated oxygen sensor (HO2S) electrical connector (3).

3. Remove the HO2S electrical connector retainer from the engine wiring harness clip (1).

4. Remove the exhaust manifold heat shield bolts (1).

Fig. 28: Identifying Exhaust Manifold Heat Shield Bolts - Left Side

5. Remove the exhaust manifold heat shield, sliding the shield up over the HO2S pigtail.

Installation Procedure

1. Install the exhaust manifold heat shield, sliding the shield down over the HO2S pigtail.

Fig. 29: Identifying Exhaust Manifold Heat Shield Bolts - Left Side

2. Install the exhaust manifold heat shield bolts (1) and tighten to 10 N.m (89 lb in).

CAUTION: Refer to Fastener Caution.

3. Connect the engine wiring harness electrical connector (2) to the HO2S electrical connector (3).

Fig. 30: Identifying Engine Wiring Harness Electrical Connector

4. Install the HO2S electrical connector retainer to the wiring harness clip (1).

5. Install the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement.

EXHAUST MUFFLER HEAT SHIELD REPLACEMENT

Removal Procedure

1. Remove the muffler assembly. Refer to Exhaust Muffler Replacement (NB5) and Exhaust Muffler Replacement (NEA/NED or N10).

Fig. 31: Identifying Exhaust Muffler Heat Shield

2. Remove the exhaust muffler front heat shield nuts (3).

3. Remove the exhaust muffler front heat shield (4).

4. Remove the exhaust muffler heat shield nuts (1).

5. Remove the exhaust muffler heat shield (2).

Installation Procedure

1. Position the exhaust muffler heat shield (2) to the floor panel.

Fig. 32: Identifying Exhaust Muffler Heat Shield

2. Install the exhaust muffler heat shield nuts (1).

CAUTION: Refer to Fastener Caution.

Tighten

• Tighten the nuts to 9 N.m (80 lb in).

3. Position the exhaust muffler front heat shield (4) to the floor panel.

4. Install the exhaust muffler front heat shield nuts (3).

Tighten

• Tighten the nuts to 9 N.m (80 lb in).

5. Install the muffler assembly. Refer to Exhaust Muffler Replacement (NB5) and Exhaust Muffler Replacement (NEA/NED or N10).

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