GM Service Manual Online
For 1990-2009 cars only

Catalytic Converter Replacement LMM

Removal Procedure


    Object Number: 1870437  Size: SH
  1. Remove the exhaust manifold pipe. Refer to Exhaust Manifold Pipe Replacement .
  2. Remove the exhaust pressure differential sensor pipe bracket bolt (1).
  3. Remove the catalytic converter hanger from the insulator (2).

  4. Object Number: 1870438  Size: SH
  5. Remove the catalytic converter nuts (1) from the particulate filter.
  6. Remove the catalytic converter.
  7. Remove and discard the catalytic converter to particulate filter gasket (2).

Installation Procedure


    Object Number: 1870438  Size: SH
  1. Install a NEW gasket (2) to the particulate filter studs.
  2. Install the catalytic converter.
  3. Notice: Refer to Fastener Notice in the Preface section.

  4. Install the catalytic converter nuts (1) to the particulate filter.
  5. Tighten
    Tighten the nuts to 45 N·m (33 lb ft).


    Object Number: 1870437  Size: SH
  6. Install the catalytic converter hanger to the insulator (2).
  7. Install the exhaust pressure differential sensor pipe bracket bolt (1).
  8. Tighten
    Tighten the bolt to 9 N·m (80 lb in).

  9. Install the exhaust manifold pipe. Refer to Exhaust Manifold Pipe Replacement .

Catalytic Converter Replacement L18

Removal Procedure

  1. Remove the exhaust manifold pipe. Refer to Exhaust Manifold Pipe Replacement .

  2. Object Number: 738367  Size: SH
  3. Remove the nuts from the tail pipe to the muffler clamp and remove the clamp.
  4. Remove the catalytic converter and muffler tail pipe.

Installation Procedure


    Object Number: 803392  Size: SH
  1. Install the catalytic converter muffler to the tail pipe and on hangers.
  2. Notice: Refer to Fastener Notice in the Preface section.

  3. Install the tail pipe and clamp.
  4. Tighten
    Tighten the nuts to 29 N·m (21 lb ft).

  5. Install the exhaust manifold pipe. Refer to Exhaust Manifold Pipe Replacement .
  6. Check for clearance and alignment.