Removal Procedure

Partially drain the cooling system in order to remove the hoses at the throttle body. Refer to Draining and Filling Cooling System in Engine Cooling.

Fig 1: Mass Air Flow/ Intake Air Temperature Air Cleaner Assembly Component View

Courtesy of GENERAL MOTORS CORP.

Remove the air intake duct (3) to the throttle body. Refer to Air Cleaner Assembly Replacement .

Fig 2: View Of IAC Valve & TP Sensor Electrical Connectors

Courtesy of GENERAL MOTORS CORP.

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.

Fig 3: View Of Accelerator Control Cable

Courtesy of GENERAL MOTORS CORP.

Fig 4: Identifying Coolant Air Bleed Hose At Throttle Body

Courtesy of GENERAL MOTORS CORP.

Fig 5: View Of Throttle Body

Courtesy of GENERAL MOTORS CORP.

Remove the throttle body attaching bolts.
Remove the throttle body and the gasket. Discard the gasket.
Clean the gasket sealing surfaces.
NOTE: 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.