Removal Procedure
- Partially drain the cooling system in order to remove the hoses at the throttle body. Refer to Cooling System Draining and Filling in Engine Cooling.
- Disconnect the intake air temperature (IAT) sensor and the mass air flow (MAF) sensor electrical connectors.
- Remove the air intake duct.
- Disconnect the throttle position (TP) sensor (2) and the idle air control (IAC) valve (1) electrical connectors.
- Disconnect the crankcase ventilation hose from the throttle body.
- Disconnect the cruise control cable at the throttle body lever.
- Disconnect the accelerator control cable at the throttle body lever.
- Disconnect the coolant hose.
- Disconnect the coolant hose from the radiator.
- Remove the throttle body attaching bolts.
- Remove the throttle body and the gasket. Discard the gasket.
- Clean the gasket sealing surfaces.
Notice: In order to prevent damage to the sealing surfaces, carefully use sharp tools in cleaning the old gasket from the aluminum surfaces.
Important:
• DO NOT soak the throttle body in cold immersion type cleaner. The throttle
valve has a factory applied sealing compound (DAG material is
applied to the outside edge of the valve and the throttle bore) to
prevent air bypass at closed throttle. Strong solvents or brushing
will remove the material. To clean the throttle body following
disassembly, use a spray type cleaner such as GM X-66A or GM
1052626 (Canadian P/N 993026). Use a shop towel to remove
heavy deposits. • The TP sensor and the IAC valve are electrical components and should
NOT come in contact with solvent or cleaner, as damage may result.
Installation Procedure
- Install the throttle body with a new gasket.
- Install the throttle body attaching bolts.
- Connect the coolant hose to the radiator.
- Connect the coolant hose.
- Connect the accelerator control cable to the throttle body lever.
- Connect the cruise control cable to the throttle body lever.
- Connect the crankcase ventilation hose to the throttle body.
- Connect the TP sensor (2) and the IAC valve (1) electrical connectors.
- Install the air intake duct.
- Connect the IAT sensor and the MAF sensor electrical connectors.
- Refill the cooling system. Refer to Cooling System Draining and Filling in Engine Cooling.
- With the engine OFF, inspect to see that the accelerator pedal is free. Depress the accelerator pedal to the floor and release.
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.
Tighten
Tighten the throttle body attaching bolts to 12 N·m (106 lb in).
