GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2008 🢒 STS 🢒 Engine 🢒 Engine Mechanical - 2.8L, 3.0L, 3.2L, or 3.6L 🢒 Intake Manifold Installation

Intake Manifold Installation LLT


    Object Number: 1977858 Size: SH
  1. Install the NEW intake manifold gasket.

    2. Object Number: 1977856 Size: SH
  2. Install the intake manifold assembly.
  3. Install the intake manifold bolts.

    4. Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 1992546 Size: SH
  4. Tighten the intake manifold bolts in the sequence shown.

    5. Tighten

    1. Tighten the intake manifold bolts in sequence to 23 N·m (17 lb ft).
    2. Tighten the intake manifold bolts a second pass in sequence to 23 N·m (17 lb ft).

    Object Number: 1977839 Size: SH
  5. Place the intake manifold brace to the engine front cover and intake manifold.
  6. Loosely install the bolts.
  7. First tighten the intake manifold brace bolt (1) to the intake manifold.

    8. Tighten
    Tighten the intake manifold brace bolt at the intake manifold to 10 N·m (89 lb in).

  8. Finally tighten the intake manifold brace bolt (2) to the engine front cover.

    9. Tighten
    Tighten the intake manifold brace bolt to the engine front cover to 65 N·m (48 lb ft).


    Object Number: 1977854 Size: SH
  9. Install the evaporative (EVAP) solenoid.
  10. Install the EVAP solenoid bolt.

    11. Tighten
    Tighten the EVAP solenoid bolt to 10 N·m (89 lb in).


    Object Number: 1977851 Size: SH
  11. Connect the EVAP hose to the upper intake manifold and EVAP solenoid.

    12. Object Number: 1977846 Size: SH
  12. Connect the positive crankcase ventilation (PCV) tube assembly to the upper intake manifold and the right camshaft cover.
  13. Install the PCV tube assembly bracket bolts.

    14. Tighten
    Tighten the PCV tube assembly bracket bolts to 10 N·m (89 lb in).


    Object Number: 1977836 Size: SH
  14. Install the brake booster hose to the upper intake manifold.