GM Service Manual Online
For 1990-2009 cars only

Exhaust Manifold Replacement LAT or LE5

Removal Procedure

Caution: Refer to Exhaust Service Caution in the Preface section.

Caution: Refer to Protective Goggles and Glove Caution in the Preface section.


    Object Number: 1890782  Size: SH
  1. Remove the exhaust manifold heat shield. Refer to Exhaust Manifold Heat Shield Replacement.
  2. Remove the heated oxygen sensor (HO2S). Refer to Heated Oxygen Sensor 1 Replacement.
  3. If equiped with a LE5, remove the exhaust manifold pipe. Refer to Exhaust Manifold Pipe Replacement.
  4. If equiped with a LAT, remove the catalytic converter. Refer to Catalytic Converter Replacement.
  5. Lower the vehicle.
  6. Remove the upper exhaust manifold brace bolt (1).

  7. Object Number: 1890783  Size: SH
  8. Remove and discard the exhaust manifold nuts (1).
  9. Remove the exhaust manifold/catalytic converter assembly (2).
  10. Remove and discard the exhaust manifold gasket.

Installation Procedure


    Object Number: 1890783  Size: SH
  1. Install a NEW exhaust manifold gasket onto the manifold studs.
  2. Install the exhaust manifold/catalytic converter assembly (2).
  3. Install the NEW exhaust manifold nuts (1) finger tight.
  4. Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 1890782  Size: SH
  5. Install the upper exhaust manifold brace bolt (1).
  6. Tighten
    Tighten the bolt to 58 N·m (43 lb ft).


    Object Number: 1340643  Size: SH
  7. Tighten the exhaust manifold nuts in the sequence shown.
  8. Tighten
    Tighten the nuts to 14 N·m (10 lb ft).

  9. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle.
  10. If equiped with a LE5, install the exhaust manifold pipe. Refer to Exhaust Manifold Pipe Replacement
  11. If equiped with a LAT, install the catalytic coverter.. Refer to Catalytic Converter Replacement.
  12. Install the HO2S. Refer to Heated Oxygen Sensor 1 Replacement.
  13. Install the exhaust manifold heat shield. Refer to Exhaust Manifold Heat Shield Replacement.

Exhaust Manifold Replacement LE5 With MH8


Object Number: 2081652  Size: MF

Callout

Component Name

Preliminary procedures

  1. Remove the Heated oxygen sensor. Refer to Heated Oxygen Sensor 1 Replacement
  2. Remove the catalytic converter. Refer to Catalytic Converter Replacement

1

Nut (Qty: 10)

Notice: Refer to Fastener Notice in the Preface section.

Tighten
14 N·m (124 lb in)

2

Exhaust Manifold

Procedure

  1. Remove and discard the Exhaust manifold gasket.
  2. Clean any exhaust manifold gasket debris from the cylinder head and exhaust manifold.
  3. Tighten the Manifold nuts working from the center out.