GM Service Manual Online
For 1990-2009 cars only

Exhaust Manifold Pipe Replacement With 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: 1684165  Size: SH
  1. Remove the heated oxygen sensor (HO2S). Refer to Heated Oxygen Sensor 2 Replacement.
  2. Remove the exhaust manifold pipe to muffler nuts.

  3. Object Number: 1523749  Size: SH
  4. Remove the exhaust manifold/catalytic converter to exhaust manifold pipe nuts.
  5. Remove the first muffler hanger insulator.
  6. Gently pull back and separate the muffler from the exhaust manifold pipe studs.
  7. Remove the exhaust manifold pipe.

Installation Procedure


    Object Number: 1523749  Size: SH
  1. Install the exhaust manifold pipe to the exhaust manifold/catalytic converter.
  2. Gently pull back and install the exhaust manifold pipe studs to the muffler.
  3. Install the first muffler hanger insulator.
  4. Notice: Refer to Fastener Notice in the Preface section.

  5. Install the exhaust manifold/catalytic converter to exhaust manifold pipe nuts.
  6. Tighten
    Tighten the nuts to 30 N·m (20 lb ft).


    Object Number: 1684165  Size: SH
  7. Install the exhaust manifold pipe to muffler nuts.
  8. Tighten
    Tighten the nuts to 25 N·m (18 lb ft).

  9. Install the HO2S. Refer to Heated Oxygen Sensor 2 Replacement.