- Install the throttle body,
if removed. Refer to
Throttle Body Assembly Replacement
in Engine Controls - 4.3L.
- Install the MAP sensor, if removed. Refer to
Manifold Absolute Pressure Sensor Replacement
in Engine
Controls - 4.3L.
- Install the PCV valve cover, if removed, using the following procedure:
3.1. | Install a NEW seal (O-ring) on the PCV valve cover. |
3.2. | Lubricate the seal with clean engine oil. |
3.3. | Install the PCV valve cover in the upper intake manifold. |
3.4. | Turn and lock the PCV valve cover in position. |
- Install the power brake
booster vacuum tube fitting, if removed, using the following procedure:
4.1. | Install a NEW seal (O-ring) on the power brake booster vacuum
tube fitting. |
4.2. | Lubricate the seal with clean engine oil. |
4.3. | Install the power brake booster vacuum tube fitting in the upper
intake manifold. |
4.4. | Turn and lock the power brake booster vacuum tube fitting in
position. |
- Install a NEW seal on
the fuel meter body assembly.
- Lubricate the seal with clean engine oil.
- Install a NEW upper intake
manifold to lower intake manifold gasket in the groove of the upper intake
manifold.
- Install the upper intake
manifold onto the lower intake manifold.
- If reusing the fasteners, apply threadlock GM P/N 12345382
or equivalent to the threads of the upper intake manifold attaching bolts.
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.
- Install the upper
intake manifold attaching studs.
Tighten
- Tighten the upper intake manifold attaching studs on the first
pass to 5 N·m (44 lb in).
- Tighten the upper intake manifold attaching studs on the final
pass to 9 N·m (80 lb in).
- Install the fuel lines to the fuel meter body assembly. Refer
to
Fuel Hose/Pipes Replacement - Engine Compartment
in Engine Controls - 4.3L.
- Install the EVAP canister purge solenoid valve. Refer to
Evaporative Emission Canister Purge Solenoid Valve Replacement
in Engine Controls - 4.3L.
- Install the accelerator
control cable bracket to the throttle body and the intake manifold.
Tighten
Tighten the accelerator control cable bracket studs and nuts to 12 N·m
(106 lb in).
- Connect the PCV valve
hose assembly to the intake manifold and the valve rocker arm cover.
- Connect the power brake
booster vacuum hose to the intake manifold.
- Position the engine wiring
harness and engine wiring harness brackets.
- Install the stud holding the engine wiring harness bracket to
the rear of the right cylinder head.
Tighten
Tighten the engine wiring harness bracket stud to 25 N·m
(18 lb ft).
- Install the nut holding the engine wiring harness bracket to the
stud at the EVAP canister purge solenoid valve.
Tighten
Tighten the engine wiring harness bracket nut to 9 N·m
(80 lb in).
- Install the nut and the ground wire on the engine wiring harness
bracket stud at the rear of the right cylinder head.
Tighten
Tighten the ground wire nut to 16 N·m (12 lb ft).
- Install the engine wiring
harness bracket on the upper intake manifold studs.
- Install the engine wiring harness bracket nuts.
Tighten
Tighten the engine wiring harness bracket nuts to 12 N·m
(106 lb in).
- Connect the following
electrical connections:
• | The A/C compressor clutch (1), if equipped |
• | The A/C pressure switch (4), if equipped |
- Connect the following
electrical connections:
• | The throttle position (TP) sensor (1) |
• | The idle air control (IAC) motor (2) |
• | The fuel meter body assembly connector (3) |
- Connect the following
electrical connections:
• | The manifold absolute pressure (MAP) sensor (2) |
• | The EVAP canister purge solenoid valve (1) |
- Install the accelerator
control cable bracket with the accelerator control cable and the cruise control
cable and the nuts to the throttle body.
Tighten
Tighten the accelerator control cable bracket nuts to 9 N·m
(80 lb in).
- Install the engine wiring harness clip to the accelerator control
cable bracket.
- Install the cruise control cable, if equipped to the throttle
shaft and the accelerator control cable bracket. Refer to
Cruise Control Cable Replacement
in Cruise Control.
- Install the accelerator
cable to the engine cable bracket.
- Install the accelerator
cable to the throttle body lever.
- Install the accelerator
cable to the cable routing bracket.
- Connect the AIR crossover
pipe to the AIR pipe assemblies.
- Align the hinge clip with
the lip on the throttle body.
Install the air inlet tube and resonator to the throttle body by pivoting
the air inlet tube and resonator downward until the mounting stud is through
the hole in the air inlet tube.
- Install the resonator
retaining wing nut.
- Connect the PCV hose to the air cleaner outlet duct.
- Connect the MAF/IAT sensor
assembly harness connector.