Throttle Body Assembly Replacement for Cadillac CTS 2003

1. Partially drain the cooling system. Refer to Cooling System Draining and Filling in Engine Cooling.



2. Disconnect the air intake duct hoses from the throttle body.



3. Disconnect the following from the throttle body:

•	The surge tank inlet hose

•	The throttle body heater hose

•	The fuel pressure regulator atmospheric vent tube




4. Disconnect the throttle body electrical connector (2) from the throttle body (1).



5. Remove the throttle body assembly mounting bolts.



6. Remove the throttle body assembly from the following:

•	The intake plenum

•	The vacuum fittings




7. Remove and discard the following:

•	The throttle body O-ring seals (1)

•	The vacuum fitting O-ring seals

1. Position the throttle body O-ring seals (1) to the grooves in the throttle body.
2. Lightly lubricate the vacuum fitting O-rings with clean engine oil.
3. Install the vacuum fitting O-rings to the vacuum fittings.



4. Simultaneously position the throttle body assembly to the following:

•	The intake plenum

•	The vacuum fittings

Notice: Refer to Fastener Notice in the Preface section.




5. Install the throttle body assembly mounting bolts.

Tighten
Tighten the throttle body assembly mounting bolts to 8 N·m (71 lb in).




6. Connect the throttle body electrical connector (2) to the throttle body (1).



7. Connect the following to the throttle body:

•	The surge tank inlet hose

•	The throttle body heater hose

•	The fuel pressure regulator atmospheric vent tube




8. Connect the air intake duct hoses to the throttle body.
9. Perform the idle learn procedure. Refer to Idle Learn .
10. Fill the cooling system. Refer to Cooling System Draining and Filling in Engine Cooling.