GM Service Manual Online
For 1990-2009 cars only

    Object Number: 1263745  Size: SH
  1. Install the exhaust manifold and exhaust manifold gasket. Tighten the exhaust manifold nuts in the following sequence: 9, 10, 6, 5, 8, 7, 2, 1, 3, 4
  2. Tighten

        • Tighten the first stage exhaust manifold nuts to 13 N·m (10 lb ft).
        • Tighten the second stage exhaust manifold nuts to 13 N·m (10 lb ft).
        • Tighten the third stage exhaust manifold nuts to 15 N·m (11 lb ft).
        • Tighten the fourth stage exhaust manifold nuts to 15 N·m (11 lb ft).

    Notice: Refer to Fastener Notice in the Preface section.

  3. Install the exhaust manifold retaining nuts in the sequence shown.
  4. Install the oxygen sensor.
  5. Install the exhaust flex pipe retaining nuts to the exhaust manifold studs.
  6. Tighten
    Tighten the flex pipe nuts to 30 N·m (22 lb ft).


    Object Number: 1263624  Size: SH
  7. Install the exhaust manifold heat shield.
  8. Tighten
    Tighten the auxiliary catalytic converter-to-exhaust manifold nuts to 30 N·m (22 lb ft).

  9. Install the exhaust manifold heat shield bolts.
  10. Tighten
    Tighten the exhaust manifold heat shield bolts to 15 N·m (11 lb ft).

  11. Connect the oxygen sensor connector.

  12. Object Number: 1263054  Size: SH
  13. Install the air inlet duct assembly.
  14. Install the air inlet duct bolts.
  15. Tighten
    Tighten the air inlet duct assembly bolts to 8 N·m (71 lb in).

  16. Connect the negative battery cable.