For 1990-2009 cars

## Exhaust Manifold Replacement rear

### Removal Procedure

Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

1. Disconnect the negative battery cable.
2. Remove the air cleaner assembly. Remove the throttle body duct. Refer to Air Cleaner Assembly Replacement in Engine Controls - 3.1L.
3. Remove the oxygen sensors. Refer to Heated Oxygen Sensor (HO2S) Replacement in Engine Controls - 3.1L.
4. Remove the exhaust crossover heat shield.
5. Remove the exhaust crossover pipe nuts.
6. Remove the crossover pipe from the manifold.
7. Remove the exhaust manifold heat shield fasteners.
8. Remove the exhaust manifold heat shield.
9. Remove the exhaust manifold nuts.
10. Remove the exhaust manifold and gaskets.
11. Clean the mating surfaces at the cylinder head and at the exhaust manifold.

### Installation Procedure

1. Install the exhaust manifold gasket.
2. Install the exhaust manifold.

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

3. Install the exhaust manifold nuts.

Tighten
Tighten the exhaust manifold nuts to 16 N·m (12 lb ft).

4. Install the exhaust manifold heat shield.
5. Install the exhaust manifold heat shield nuts.

Tighten
Tighten the exhaust manifold heat shield nuts to 10 N·m (89 lb in).

6. Install the exhaust crossover pipe to the manifold.
7. Install the exhaust crossover pipe heat shield.
8. Install the top half of the air cleaner assembly. Refer to Air Cleaner Assembly Replacement in Engine Controls - 3.1L.
9. Install the throttle body duct.

Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

10. Connect the negative battery cable.

## Exhaust Manifold Replacement front

### Removal Procedure

Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

1. Disconnect the negative battery cable.
2. Remove the air cleaner assembly. Refer to Air Cleaner Assembly Replacement in Engine Controls - 3.1L.
3. Remove the throttle body duct.
4. Remove the exhaust crossover heat shield.
5. Partially drain the cooling system. Refer to Cooling System Draining and Filling in Engine Cooling.
6. Remove the crossover pipe at the exhaust manifold.
7. Remove the upper radiator hose from the thermostat housing. Refer to Radiator Hose Replacement in Engine Cooling.
8. Disconnect the ignition wires from the front spark plugs and position aside.
9. Remove the exhaust manifold heat shield fasteners.
10. Remove the exhaust manifold heat shield.
11. Remove the exhaust manifold nuts.
12. Remove the exhaust manifold from the bottom of the vehicle.
13. Remove the exhaust manifold gasket.
14. Clean the mating surfaces at the cylinder head and at the exhaust manifold.

### Installation Procedure

1. Install the exhaust manifold gasket.
2. Install the exhaust manifold.

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

3. Install the exhaust manifold nuts.

Tighten
Tighten the exhaust manifold nuts to 16 N·m (12 lb ft).

4. Install the exhaust manifold heat shield.
5. Install the exhaust manifold heat shield nuts.

Tighten
Tighten the exhaust manifold heat shield nuts to 10 N·m (89 lb in).

6. Install the crossover pipe to the exhaust manifolds.
7. Install the crossover heat shield.
8. Install the heater bypass tubes.
9. Install the upper radiator hose. Refer to Radiator Hose Replacement in Engine Cooling.
10. Connect the ignition wire to the front spark plugs.
11. Refill the cooling system. Refer to Cooling System Draining and Filling in Engine Cooling.
12. Install the top half of the air cleaner assembly. Refer to Air Cleaner Assembly Replacement in Engine Controls - 3.1L.
13. Install the throttle body duct.
14. Connect the negative battery cable.
15. Inspect for exhaust leaks.