Intake Manifold Installation

WARNING: This page is about a different car, the 2003 GMC Envoy XL and 2003 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.

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 use intake manifold gaskets again. Install NEW intake manifold-to-cylinder head gaskets.

(1).

Fig 1: Installing Intake Manifold-To-Cylinder Head Gaskets
Courtesy of GENERAL MOTORS CORP.
Install the intake manifold.
Apply a 5 mm (0.20 in) band of threadlock GM P/N 12345382 (Canadian P/N 10953489) or equivalent to the threads of the intake manifold bolts. Refer to SEALERS, ADHESIVES, AND LUBRICANTS .

Fig 2: Installing Intake Manifold
Courtesy of GENERAL MOTORS CORP.

NOTE: Refer to FASTENER NOTICE in Cautions and Notices.
Install the intake manifold bolts.
Tighten
1. 4.1. Tighten intake manifold bolts first pass in sequence to 5 N.m (44 lb in).
2. 4.2. Tighten intake manifold bolts final pass in sequence to 10 N.m (89 lb in).
  
  Fig 3: Installing Intake Manifold Bolts In Sequence
  Courtesy of GENERAL MOTORS CORP.
Install the manifold absolute pressure (MAP) sensor (1), if previously removed.
The electrical connector end of the sensor should be facing the front of the engine.

Fig 4: Installing Manifold Absolute Pressure (MAP) Sensor
Courtesy of GENERAL MOTORS CORP.
Install the positive crankcase ventilation (PCV) valve (2) and hose (1).
Install the engine coolant air bleed hose and clamp onto the throttle body.

Fig 5: Installing Positive Crankcase Ventilation (PCV) Valve And Hose
Courtesy of GENERAL MOTORS CORP.
Install the evaporative emission (EVAP) purge solenoid (3), bolt (2), and isolator (1).
Tighten

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

Fig 6: Installing Evaporative Emission (EVAP) Purge Solenoid, Bolt And Isolator
Courtesy of GENERAL MOTORS CORP.