Throttle Body Assembly Removal and Replacement

Throttle Body Removal:

CAUTION: The throttle bore and valve deposits may be cleaned on the vehicle, using carburetor cleaner and a parts cleaning brush. Do Not use a cleaner that contains Methyl Ethyl Ketone. It is an extremely strong solvent, and not necessary for this type of deposit.
^ The throttle body parts may be cleaned following disassembly, in a cold immersion type cleaner such as GM X-55 or equivalent.
^ The throttle position sensor (TPS) and idle air control (IAC) valve should not come in contact with solvent or cleaner, as they are electrical components and may be damaged.

REMOVAL:

1. Disconnect the negative battery cable.
2. Partially drain the radiator, to allow the coolant hoses to be removed from the throttle body.
3. Remove the throttle body to mass air flow sensor duct.
4. Disconnect the IAC valve and TPS electrical connectors.
5. Disconnect the vacuum lines.
6. Disconnect the coolant hoses from the throttle body.
7. Disconnect the throttle, T,V, (transmission control), and cruise control cables.
8. Remove the throttle body attaching bolts.
9. Remove the throttle body assembly and flange gasket, discard the gasket.
10. Clean the gasket sealing surfaces:
^ Use care in cleaning old gasket material from machined aluminum surfaces. Sharp tools may damage sealing surfaces.

Throttle Body Identification Number:

NOTE: An eight digit part identification number is stamped on the bottom side of the throttle body casting next to the coolant cover. Refer to this number if servicing, or part replacement is required. For identification of parts during repair, refer to the disassembled view.

Throttle Body Assembly Exploded View:

INSTALLATION:

1. Install the throttle body assembly with a new flange gasket.
2. Install the throttle body attaching bolts and tighten to 24 Nm (18 lb.ft).
3. Connect the throttle, T.V., and cruise control cables.

NOTE: Make sure that the throttle and cruise control cables do not hold the throttle open.

4. Connect the coolant hoses to the throttle body.
5. Connect the vacuum lines.
6. Connect the IAC and TPS electrical connectors.
7. Install the throttle body to mass air flow sensor duct.
8. Refill the radiator.
9. Connect the negative battery cable.
10. With the engine OFF, check to see that the accelerator pedal is free, depress the accelerator pedal to the floor and release.