GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2001 🢒 Tracker - 4WD 🢒 Engine 🢒 Engine Cooling 🢒 Exhaust Manifold Replacement

Exhaust Manifold Replacement 1.6L Engine

Removal Procedure

Caution: While engine is operating, the exhaust system will become extremely hot. To prevent burns avoid contacting a hot exhaust system.

    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. Disconnect the heated oxygen sensor (HO2S1) electrical connector.

    3. Object Number: 466418 Size: SH
  3. Remove the following from the exhaust manifold:
    4. • 2 nuts
    • 3 bolts
    • The upper exhaust manifold heat shield (1)
  4. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.

    5. Object Number: 166262 Size: SH
  5. Remove the following from the exhaust manifold and engine block:
    6. • 2 bolts
    • 1 nut
    • The exhaust manifold reinforcement bracket (1)

    Object Number: 166268 Size: SH
  6. Remove the following from the exhaust manifold (1):
    7. • 2 bolts
    • The front pipe/three way catalytic converter (TWC) assembly (3)
  7. Lower the vehicle.

    8. Object Number: 466413 Size: SH
  8. Remove the 9 nuts and the lift hook from the exhaust manifold (3).

    9. Object Number: 466355 Size: SH
  9. Remove the exhaust manifold (3) with the gasket (2).

    10. Object Number: 166265 Size: SH
  10. Remove the three bolts and lower the exhaust manifold heat shield (6) from the exhaust manifold (2).
  11. Remove the heated oxygen (HO2S1) Sensor (4) from the exhaust manifold (2).
  12. Remove the three way catalytic converter (TWC) front pipe gasket from the exhaust manifold (2).

Installation Procedure

    Object Number: 166265 Size: SH

    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.

  1. Install the heated oxygen (HO2S1) sensor (4) into the exhaust manifold (2).

    2. Tighten
    Tighten the (HO2S1) Sensor to 43 N·m (32 lb ft).

  2. Install the 3 bolts and lower the exhaust manifold heat shield (6) to the exhaust manifold (2).

    3. Tighten
    Tighten the lower manifold heat shield bolts to 10 N·m (89 lb in).


    Object Number: 466355 Size: SH
  3. Install the new exhaust manifold gasket (2) and the exhaust manifold (3).

    4. Object Number: 466413 Size: SH
  4. Install the engine hanger (3) to the cylinder head. Secure the exhaust manifold and hanger with 9 nuts (1).

    5. Tighten
    Tighten the exhaust manifold nuts to 23 N·m (17 lb ft).

  5. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.

    6. Object Number: 166268 Size: SH
  6. Install the front pipe/TWC assembly (3) with a new gasket (2) to the exhaust manifold (1). Secure the assembly with 2 bolts.

    7. Tighten
    Tighten the exhaust manifold-to-front pipe/TWC assembly bolts to 50 N·m (37 lb ft).


    Object Number: 166262 Size: SH
  7. Install the exhaust manifold brackets (1) to the exhaust manifold and the engine block. Secure the brackets with 1 nut and 2 bolts.

    8. Tighten

        • Tighten the engine mount-to-exhaust bracket bolts to 54 N·m (40 lb ft).
        • Install the exhaust bracket-to-exhaust manifold nut to 50 N·m (37 lb ft).
  8. Lower the vehicle.

    9. Object Number: 466418 Size: SH
  9. Install the upper exhaust manifold heat shield (1) to the exhaust manifold. Secure the heat shield with 2 nuts and 3 bolts.

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

  10. Connect the (HO2S1) electrical connector.
  11. Connect the negative battery cable.

    12. Tighten
    Tighten the negative battery cable bolt to 15 N·m (11 lb ft).

Exhaust Manifold Replacement 2.0L Engine

Removal Procedure

Caution: In order to avoid being burned, do not service the exhaust system while it is still hot. Service the system when it is cool.


    Object Number: 464717 Size: SH

    Important: California emissions vehicles are equipped with an additional catalytic converter (PUP catalytic converter) and a different exhaust manifold from federal emissions vehicles.

  1. Perform the following if the vehicle is equipped with the PUP catalytic converter:
    2. 1.1. Remove the 3 bolts and 2 nuts and remove the exhaust manifold heat shield from the exhaust manifold.
    1.2. Remove the 3 nuts and separate the front pipe/catalytic converter assembly from the exhaust manifold.
    1.3. Remove the engine mount-to-front pipe/catalytic converter assembly bracket.
    1.4. Remove the exhaust manifold-to-engine block bracket.

    Object Number: 464715 Size: SH
  2. Perform the following if the vehicle is not equipped with the PUP catalytic converter:
    3. 2.1. Remove the 4 bolts and 1 nut and the exhaust manifold heat shield.
    2.2. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
    2.3. Remove the two bolts and separate the front pipe assembly from the exhaust manifold.
    2.4. Lower the vehicle.
    2.5. Remove the exhaust manifold-to-engine block bracket.
  3. Disconnect the oxygen sensor electrical connector.
  4. Remove the oxygen sensor from the exhaust manifold.
  5. Remove the 1 bolt and 8 nuts from the exhaust manifold.
  6. Remove the exhaust manifold, the engine lift hook, and the gasket from the cylinder head.

Installation Procedure

    Object Number: 464717 Size: SH
  1. Perform the following if the vehicle is equipped with the PUP catalytic converter:
    2. 1.1. Install the new exhaust manifold gasket to the cylinder head.

    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.

    1.2. Install the exhaust manifold and the engine lift hook to the cylinder head. Secure the exhaust manifold with the 8 nuts and 1 bolt.

    Tighten
    Tighten the 8 nuts and 1 bolt to 50 N·m (37 lb ft).

    1.3. Connect the lower exhaust pipe to the exhaust manifold with a new gasket. Secure with the 3 nuts.

    Tighten
    Tighten the 3 nuts to 50 N·m (37 lb ft).

    1.4. Install the exhaust manifold heat shield to the exhaust manifold. Secure the exhaust manifold heat shield with 3 bolts and 2 nuts.

    Object Number: 464715 Size: SH
  2. Perform the following if the vehicle is not equipped with the PUP catalytic converter:
    3. 2.1. Install the new exhaust manifold gasket to the cylinder head.
    2.2. Install the exhaust manifold and the engine lift hook to the cylinder head. Secure the exhaust manifold with the 1 bolt and the 8 nuts.

    Tighten
    Tighten the 8 nuts and 1 bolt to 50 N·m (37 lb ft).

    2.3. Raise the vehicle.
    2.4. Install the front pipe assembly to the exhaust manifold with a new seal. Secure the assembly with the two bolts.

    Tighten
    Tighten the exhaust manifold-to-front pipe assembly bolts to 50 N·m (37 lb ft).

    2.5. Lower the vehicle.
    2.6. Install the exhaust manifold-to-engine block bracket.
    2.7. Install the exhaust manifold heat shield to the exhaust manifold. Secure the exhaust manifold heat shield with 4 bolts and 1 nut.
  3. Apply anti-seize compound to the threads of the oxygen sensor.
  4. Install the oxygen sensor.

    5. Tighten
    Tighten the oxygen sensor to 45 N·m (33 lb ft).

  5. Connect the oxygen sensor electrical connector.
  6. Inspect the exhaust system for exhaust gas leakage.

Exhaust Manifold Replacement 2.5L Engine, Right Side

Removal Procedure
  1. Remove the air cleaner upper case and intake air hose.

    2. Object Number: 716787 Size: SH
  2. Detach the oxygen sensor couplers from the mounting bracket (1) and disconnect the oxygen sensor (HO2S1) electrical connectors (2).

    3. Object Number: 716796 Size: SH
  3. Disconnect the EGR pipe (1) from the exhaust manifold (2).

    4. Object Number: 716799 Size: SH
  4. Remove the exhaust manifold cover bolts (1) and the cover (2).
  5. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.

    6. Object Number: 716802 Size: SH
  6. Remove the following from the exhaust manifold and engine block:
    7. • 1 bolt
    • 1 nut
    • The exhaust manifold reinforcement bracket (1)
  7. Remove the front pipe. Refer to Front Pipe Replacement .
  8. Lower the vehicle.
  9. Remove the nuts and bolts from the exhaust manifold.
  10. Remove the exhaust manifold with the gasket.

Installation Procedure

    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.

    Important: When installing a new exhaust system component, always use new gaskets and seals.

  1. Install the exhaust manifold with a new gasket.

    2. Tighten
    Tighten the manifold bolts and nuts to 30 N·m (21.5 lb ft).

  2. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  3. Install the front pipe. Refer to Front Pipe Replacement .

    4. Object Number: 716802 Size: SH
  4. Install the exhaust manifold reinforcement bracket to the exhaust manifold and engine block:

    5. Tighten

    • Tighten the engine mount-to-exhaust bracket bolt (1) to 54 N·m (40 lb ft).
    • Tighten the exhaust bracket-to-exhaust manifold nut (2) to 50 N·m (37 lb ft).
  5. Lower the vehicle.

    6. Object Number: 716799 Size: SH
  6. Install the exhaust manifold cover  (2) and the cover bolts (1).

    7. Tighten
    Tighten the lower manifold heat shield bolts to 10 N·m (89 lb in).


    Object Number: 716796 Size: SH
  7. Connect the EGR pipe (1) to the exhaust manifold (2).

    8. Object Number: 716787 Size: SH
  8. Attach the oxygen sensor couplers to the mounting bracket (1) and connect the oxygen sensor (HO2S1) electrical connectors (2).
  9. Install the air cleaner upper case and intake air hose.

Exhaust Manifold Replacement 2.5L Engine, Left Side

Removal Procedure

    Object Number: 716787 Size: SH
  1. Detach the oxygen sensor couplers from the mounting bracket (1) and disconnect the oxygen sensor (HO2S1) electrical connectors (2).
  2. Remove the oil dipstick and tube (3).

    3. Object Number: 717133 Size: SH
  3. Remove the exhaust manifold cover bolts (1) and the cover (2).
  4. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.

    5. Object Number: 717136 Size: SH
  5. Remove the following from the exhaust manifold and engine block:
    6. • 1 bolt
    • 1 nut
    • The exhaust manifold reinforcement bracket (1)
  6. Remove the front pipe. Refer to Front Pipe Replacement .
  7. Lower the vehicle.

    8. Object Number: 717138 Size: SH
  8. Remove the nuts and bolts (1) from the exhaust manifold (2).
  9. Remove the exhaust manifold and the gasket.

Installation Procedure

    Object Number: 717138 Size: SH

    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.

    Important: When installing a new exhaust system component, always use new gaskets and seals.

  1. Install the exhaust manifold with a new gasket.

    2. Tighten
    Tighten the manifold nuts and bolts (1) to 30 N·m (21.5 lb ft).

  2. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.

    3. Object Number: 717136 Size: SH
  3. Install the exhaust manifold reinforcement bracket following to the exhaust manifold and engine block:

    4. Tighten

    • Tighten the engine mount-to-exhaust bracket bolt (1) to 54 N·m (40 lb ft).
    • Tighten the exhaust bracket-to-exhaust manifold nut (2) to 50 N·m (37 lb ft).
  4. Install the front pipe. Refer to Front Pipe Replacement .
  5. Lower the vehicle.

    6. Object Number: 717133 Size: SH
  6. Install the exhaust manifold cover  (2) and the cover bolts (1).

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

  7. Install the oil dipstick and tube (3) using a new O-ring.

    8. Object Number: 716787 Size: SH
  8. Attach the oxygen sensor couplers to the mounting bracket (1) and connect the oxygen sensor (HO2S1) electrical connectors (2).