Throttle Body Assembly Removal and Replacement

Throttle Body Identification:

NOTE: The last five digits of the identification number are stamped on the throttle body casting, next to the throttle stop screw. The part number begins with "170...." refer to this number if servicing or part replacement is required.

CLEANING: The throttle bore and valve deposits may be cleaned on-vehicle, using carburetor cleaner and a shop towel. 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 metal parts may be cleaned following disassembly, in a cold immersion-type cleaner such as GM X-55 or equivalent.

NOTE: The Throttle Position Sensor (TPS) and Idle Air Control (IAC) valve should "NOT" come in contact with solvent or cleaner, as they may be damaged.

Throttle Body Assembly Exploded View:

Throttle Body Removal:

REMOVAL:

1. Disconnect the negative battery cable.
2. Partially drain the radiator.
3. Remove the vacuum hoses from the throttle body.
4. Disconnect the IAC and TPS electrical connectors.
5. Remove the air cleaner to throttle body duct.
6. Remove the coolant hoses from the throttle body.
7. Disconnect the throttle, TV (transmission control), and cruise control linkage.
8. Remove the power steering pump brace.
9. Remove the throttle body retaining bolts.
10. Remove the throttle body and flange gasket, discard gasket.

NOTE: Use care in cleaning old gasket material from machined aluminum surfaces. Sharp tools may damage gasket sealing surfaces.

INSTALLATION:

1. Position the throttle body and new flange gasket in place.
2. Insert the throttle body retaining bolts and tighten to 26 Nm (19 lb.ft).
3. Install the power steering brace and tighten.
4. Connect throttle, TV (transmission control), and cruise control linkage.

NOTE: Make sure that the throttle and cruise control linkage does not hold the throttle open.

5. Connect the coolant hoses to the throttle body.
6. Install the air cleaner to throttle body duct.
7. Reconnect IAC and TPS electrical connectors.
8. Reconnect the vacuum lines to the throttle body.
9. Refill the radiator.
10. Connect the negative battery cable.
11. With the engine "OFF," check to see that the accelerator pedal is free. Depress the pedal all the way to the floor and release.

NOTE: No physical adjustment of the IAC valve assembly is required after installing in the throttle body. The IAC valve is reset by the ECM when the car is driven normally above 20 mph.