GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1999 🢒 Chevy C Silverado - 2WD 🢒 Engine 🢒 Engine Mechanical - 4.8L, 5.3L, and 6.0L 🢒 Intake Manifold Installation

    Object Number: 492770 Size: SH

    Important: 

       • The intake manifold, throttle body, fuel injection rail and fuel injectors may be removed as an assembly. If not servicing the individual components, install the intake manifold as a complete assembly.
       • DO NOT reuse intake manifold gaskets. Install NEW intake manifold-to-cylinder head gaskets.

  1. Install NEW intake manifold-to-cylinder head gaskets (1).

    2. Object Number: 260092 Size: SH
  2. Install the intake manifold.
  3. Apply a 5 mm (0.20 in) band of threadlock GM P/N 12345382 or equivalent to the threads of the intake manifold bolts. Refer to Sealers, Adhesives, and Lubricants .

    4. Object Number: 63222 Size: SH

    Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  4. Install the intake manifold bolts.

    5. Tighten

    1. Tighten intake manifold bolts first pass in sequence to 5 N·m (44 lb in).
    2. Tighten intake manifold bolts final pass in sequence to 10 N·m (89 lb in).

    Object Number: 260159 Size: SH
  5. Install the Manifold Absolute Pressure (MAP) sensor (1) (if previously removed).

    6. The electrical connector end of the sensor should be facing the front of the engine.


    Object Number: 260078 Size: SH
  6. Install the Positive Crankcase Ventilation (PCV) valve (2) and hose (1).
  7. Install the engine coolant air bleed hose and clamp onto the throttle body.

    8. Object Number: 492765 Size: SH
  8. Install the accelerator control cable bracket (2) and bolts (1) (if applicable).

    9. Tighten
    Tighten the accelerator control cable bracket bolts to 10 N·m (89 lb in).


    Object Number: 389993 Size: SH
  9. Install the evaporative emmission (EVAP) purge solenoid (3), bolt (2), and isolator (1).

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