Century, Grand Prix, Impala, Intrigue, Lumina, Monte Carlo, Regal 2001-2005

Throttle Body

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Removal & Installation



3.4L Engine
  1. Partially drain the cooling system.
  2.  
  3. Remove the air cleaner intake duct.
  4.  
  5. Disconnect the idle air control (IAC) valve electrical connector.
  6.  
  7. Disconnect the throttle position (TP) sensor electrical connector.
  8.  
  9. Remove the accelerator control cable bracket.
  10.  
  11. Remove the throttle body inlet (3) and the outlet (4) hoses from the throttle body.
  12.  
  13. Remove the heater pipe nut at the throttle body.
  14.  
  15. Remove the nuts and the bolts from the throttle body.
  16.  
  17. Remove the throttle body assembly.
  18.  
  19. Remove the throttle body gasket.
    NOTE
    Do not use solvent of any type when cleaning the gasket surfaces on the intake manifold and the throttle body assembly, as damage to the gasket surfaces and throttle body assembly may result. Use care in cleaning the gasket surfaces on the intake manifold and the throttle body assembly, as sharp tools may damage the gasket surfaces.

  20.  
  21. Clean and inspect the throttle body gasket mating surface.
  22.  

To install:


NOTE
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.

  1. Install a new gasket, if necessary.
  2.  
  3. Install the throttle body assembly. Tighten the nuts and the bolts to 21 ft. lbs. (28 Nm).
  4.  
  5. Install the throttle body inlet and the outlet hoses to the throttle body.
  6.  
  7. Install the heater pipe nut to the throttle body. Tighten the nut to 18 ft. lbs. (25 Nm).
  8.  
  9. Connect the IAC valve electrical connector.
  10.  
  11. Connect the TP sensor electrical connector.
  12.  
  13. Install the accelerator controls cable bracket.
  14.  
  15. Install the air cleaner intake duct.
  16.  
  17. Fill the cooling system.
  18.  

3.5L & 3.9L Engines

NOTE
Handle the electronic throttle control components carefully. Use cleanliness in order to prevent damage. Do not drop the electronic throttle control components. Do not roughly handle the electronic throttle control components. Do not immerse the electronic throttle control components in cleaning solvents of any type.


CAUTION
DO NOT for any reason, insert a screwdriver or other small hand tool into the throttle body to hold open the throttle plate as a wedge, as the inside of the throttle body could be damaged. An 8-digit part identification number is stamped on the throttle body casting. Refer to this number, if servicing or part replacement is required.

  1. Remove the intake manifold cover.
  2.  
  3. Drain the engine cooling.
  4.  
  5. Remove the air cleaner outlet duct.
  6.  
  7. Disconnect the electronic throttle control (ETC) electrical connector.
  8.  
  9. Remove the heater inlet and outlet pipe clip nuts from the throttle body studs.
  10.  
  11. Reposition the heater inlet and outlet hose clamps at the engine pipes.
  12.  
  13. Reposition the heater inlet and outlet hose/pipe.
  14.  
  15. Remove the throttle body bolts/studs.
  16.  
  17. Remove the throttle body. Remove and discard the throttle body gasket.
  18.  

To install:


CAUTION
DO NOT reuse the throttle body gasket. Install a NEW gasket during assembly.

  1. Install a NEW throttle body gasket. Align the locating tab of the gasket with the notch in the manifold.
  2.  
  3. Position the throttle body to the intake manifold.
  4.  
  5. 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.
  6.  
  7. Install the throttle body bolts. Tighten the bolts to 89 inch lbs. (10 Nm).
  8.  
  9. Position the heater inlet and outlet hose/pipe.
  10.  
  11. Position the heater inlet and outlet hose clamps at the engine pipes.
  12.  
  13. Install the heater inlet and outlet pipe clip nuts to the throttle body studs. Tighten the nuts to 89 inch lbs. (10 Nm).
    CAUTION
    Verify that the throttle actuator motor harness connector and the connector seal are properly installed and not damaged.

  14.  
  15. Connect the ETC electrical connector. Install the air cleaner outlet duct.
  16.  
  17. Fill the engine cooling. Install the intake manifold cover.
  18.  
  19. Connect a scan tool in order to test for proper throttle opening and throttle closing ranges.
  20.  
  21. Operate the accelerator pedal and monitor the throttle angles. The accelerator pedal should operate freely, without binding, between closed throttle, and wide open throttle (WOT).
  22.  
  23. Verify that the vehicle meets the following conditions:

    The vehicle is not in a reduced engine power mode
     
    The ignition is ON
     
    The engine is OFF
     

  24.  

3.8L Engine
  1. Partially drain the cooling system.
  2.  
  3. Remove the fuel injector sight shield.
  4.  
  5. Remove the air cleaner intake duct.
  6.  
  7. Disconnect the throttle body electrical connector.
  8.  
  9. Remove the throttle body nuts and the bolts.
  10.  
  11. Remove the throttle body assembly.
    NOTE
    Do not use solvent of any type when cleaning the gasket surfaces on the intake manifold and the throttle body assembly, as damage to the gasket surfaces and throttle body assembly may result. Use care in cleaning the gasket surfaces on the intake manifold and the throttle body assembly, as sharp tools may damage the gasket surfaces.

  12.  
  13. Clean the throttle body gasket mating surfaces.
  14.  
  15. To install, reverse removal procedure. Install a new gasket. Tighten the throttle body bolts and the nuts to 89 inch lbs. (10 Nm).
  16.  
  17. Fill the cooling system as necessary.
  18.  

5.3L Engine

NOTE
Handle the electronic throttle control components carefully. Use cleanliness in order to prevent damage. Do not drop the electronic throttle control components. Do not roughly handle the electronic throttle control components. Do not immerse the electronic throttle control components in cleaning solvents of any type.


CAUTION
DO NOT for any reason, insert a screwdriver or other small hand tool into the throttle body to hold open the throttle plate as a wedge, as the inside of the throttle body could be damaged. An 8 digit part identification number is stamped on the throttle body casting. Refer to this number if servicing, or part replacement is required.

  1. Remove the engine sight shield.
  2.  
  3. Remove the air cleaner outlet duct.
  4.  
  5. Disconnect the throttle actuator control motor electrical connector.
  6.  
  7. Disconnect the evaporative emission (EVAP) canister purge tube from the throttle body.
  8.  
  9. Remove the throttle body bolts.
  10.  
  11. Remove and discard the throttle body gasket.
  12.  

To install:

  1. Install a NEW throttle body gasket. Align the locating tab of the gasket with the notch in the manifold.
  2.  
  3. Position the throttle body to the intake manifold.
    NOTE
    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.

  4.  
  5. Install the bolts and tighten to 89 inch lbs. (10 Nm).
  6.  
  7. To complete installation, reverse remaining removal procedure.
  8.  
  9. Connect a scan tool in order to test for proper throttle opening and throttle closing ranges.
  10.  
  11. Operate the accelerator pedal and monitor the throttle angles. The accelerator pedal should operate freely, without binding, between closed throttle, and wide open throttle (WOT).
  12.  
  13. Verify that the vehicle meets the following conditions:

    The vehicle is not in a reduced engine power mode
     
    The ignition is ON
     
    The engine is OFF
     

  14.  

 
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