Throttle Body Assembly Replacement Inspection Procedure

Notice: Do not damage the MAF sensor screen. A damaged screen could restrict airflow and lead to a driveability concern.

1. Remove the MAF sensor bolts and intake air duct as an assembly.

Notice: Do not use any solvent that contains Methyl Ethyl Ketone (MEK). This solvent may damage fuel system components.




2. Inspect the throttle body bore and throttle valve plate for deposits. It is necessary to open the throttle valve to inspect all surfaces.
3. Clean the throttle body bore and throttle valve plate using a clean shop towel with GM Top Engine Cleaner, P/N 1052626 or AC-Delco Carburetor Tune-Up Conditioner, P/N X66-P, or equivalent product.

Notice: The outlet of the air cleaner assembly and the MAF sensor inlet duct must line up when completely installed. Misalignment may cause incorrect airflow readings resulting in MIL illumination or a driveability concern. An improperly installed inlet duct assembly or air cleaner assembly may cause misalignment.

1. Install the MAF sensor with three bolts and intake air duct as an assembly.

Tighten
Tighten the MAF sensor attaching bolts to 8 N·m  (71 lb  in).

Refer to the

Notice: 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.

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Throttle Body Assembly Replacement 4.6L

Tools Required

J 34730-1A , Fuel Pressure Guage

Notice: Do not damage the MAF sensor screen. A damaged screen could restrict airflow and lead to a driveability concern.

1. Relieve the fuel pressure. Refer to Fuel Pressure Relief Procedure .
2. Remove the intake air duct (1) clamp (2) from the air cleaner assembly (3).
3. Remove the intake air duct (1) clamp (5) from the MAF sensor (4).



4. Remove the transaxle vent hose (4) from the clip (3) that is attached to the accelerator control cable bracket.
5. Remove the MAF sensor electrical connector (2) from the MAF sensor (5).



6. Remove the MAF sensor.



7. Remove the cruise control cable (2) from the accelerator control cable bracket.
8. Remove the accelerator cable (3) from the accelerator control cable bracket.



9. Disconnect the transaxle shift cable clip from the accelerator control cable bracket.



10. Remove the accelerator cable (3) from throttle body lever (1).
11. Remove the cruise control cable (2) from throttle body lever (1).



12. Remove the TP sensor connector (6) from the TP sensor (7).
13. Remove the IAC valve electrical connector (1) from the IAC valve (8).



14. Remove the throttle body coolant hoses at the throttle body (1).



15. Remove the 3 accelerator cable bracket bolts from the throttle body.



16. Remove the throttle body (1) and gasket (2) bolts from the throttle body.

Notice: The TP sensor is an electrical component. Do not soak the TP sensor in any liquid cleaner or solvent, as damage may result.

Notice: If the IAC valve has been in service: DO NOT push or pull on the IAC valve pintle. The force required to move the pintle may damage the threads on the worm drive. Also, DO NOT soak the IAC valve in any liquid cleaner or solvent, as damage may result.

Notice: Do not use a cleaner which contains methyl ethyl ketone. This extremely strong solvent may damage components and is not necessary for this type of cleaning.

Use a carburetor cleaner in order to remove deposits.
Refer to the instructions provided with the cleaner.

Notice: Use care when cleaning the old gasket from the aluminum surfaces in order to prevent damage to the sealing surfaces.




1. Remove the TP Sensor attaching screws (3) from the TP Sensor (2).
2. Remove the TP Sensor (2) from the throttle body.
3. Remove the IAC Valve attaching screws (4) from the IAC valve (1).
4. Remove the IAC Valve (1).
5. Clean the throttle body gasket surfaces.

1. Install the IAC valve (1) to the throttle body.

Tighten
Tighten the screws to 2.3 N·m (20 lb in).

Refer to the

Notice: 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.

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2. Install the TP Sensor (2) to the throttle body.

Tighten
Tighten the screws to 2.3 N·m (20 lb in).

Refer to the

Notice: 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.

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Important: The outlet of the air cleaner assembly and the MAF sensor inlet duct must line up when completely installed. An improperly installed air cleaner or a distorted/missing intake air duct assembly may cause a DTC to set. Ensure that the air cleaner assembly and the intake air duct is installed correctly and that there are no kinks or folds in the intake air duct or possible debris in the air cleaner assembly or the MAF sensor inlet screen that may distort the air flow.

Important: Do Not Reuse the old throttle body gasket.

1. Position the new throttle body gasket (2) on throttle body (1).
2. Install the throttle body (1) to throttle body spacer (3) and finger tighten 2 lower bolts.
3. Install the 3 accelerator control cable bracket bolts to the throttle body.

Tighten
Tighten the throttle body and accelerator control cable bolts to 12 N·m (9 ft lb).

Refer to the

Notice: 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.

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4. Install the throttle body coolant hoses (1) at throttle body.



5. Install the IAC valve electrical connector to the IAC valve.
6. Install the TP sensor electrical connector to the TP sensor.



7. Install the accelerator control cable (3) at throttle body lever (1).
8. Install the cruise control cable (2) at throttle body lever (1).



9. Install the transaxle shift cable into the clip on the accelerator control cable bracket.



10. Install the cruise control cable (1) to accelerator control cable bracket.



11. Install the accelerator cable (2) to accelerator control cable bracket (3).



12. Install the transaxle vent hose to the clip on the accelerator control cable bracket.



13. Install the MAF sensor to the throttle body.
14. Install the MAF sensor electrical connector to the MAF sensor.



15. Install the air intake duct (1) clamp (5) to the MAF sensor (4).
16. Install the air intake duct (1) clamp (2) to the air cleaner assembly (3).

Tighten
Tighten the clamps (2), (5), to 3 N·m (27 lb in).

17. Install the negative battery cable. Refer to Battery.

Notice: When adding coolant, it is important that only Dex-Cool™ (silacate-free) coolant be used. If coolant other than Dex-Cool™ coolant is added to the system, premature engine, heater core, or radiator corrosion may result.

18. Check and add coolant as necessary.

Throttle Body Assembly Replacement Spacer

Tools Required

J 34730-1A , Fuel Pressure Gauge

1. Relieve fuel system pressure. Refer to Fuel Pressure Relief Procedure .

Remove the air intake duct (1) clamp (2) from the air cleaner assembly (3).

2. Remove the intake air duct (1) clamp (5) from the MAF sensor (4).



3. Disconnect the transaxle vent hose (2) from the clip attached to the accelerator control cable bracket (1).



4. Remove the throttle body mount bolts from the throttle body (1).

Refer to Throttle Body Assembly Replacement .

5. Remove the throttle body. Refer to Throttle Body Assembly Replacement .
6. Remove the throttle body spacer bolts from the spacer.



7. Remove the EGR pipe at throttle body spacer.



8. Remove the crankcase ventilation pipe at the throttle body spacer.
9. Remove the throttle body spacer (3) and gasket (2) from the intake manifold (4).

Important: Use care when cleaning the old gasket from the aluminum surfaces.

10. Clean the throttle body gasket surfaces.
11. Clean the throttle body spacer gasket surfaces.

1. Install the throttle body spacer gasket and throttle body spacer (3) to the intake manifold (4).
2. Install the throttle body spacer bolts.

Tighten
Tighten the throttle body spacer attaching bolts to 12 N·m (106 lb in).

Refer to the

Notice: 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.

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3. Install the EGR pipe to the throttle body spacer.

Tighten
Tighten the EGR pipe bolt to 28 N·m (21 lb ft).

Refer to the

Notice: 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.

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4. Install the crankcase ventilation pipe at the throttle body spacer.



5. Install the new gasket (2) and throttle body (1). Refer to Throttle Body Assembly Replacement .

Tighten
Tighten the throttle body attaching bolts to 12 N·m  (106 lb in).

Refer to the

Notice: 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.

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6. Install the transaxle vent hose (2) to the clip attached to the accelerator control cable bracket (1).



7. Install the intake air duct (1) clamp (5) to the MAF sensor (4).
8. Install the air intake duct (1) clamp (2) to the air cleaner assembly (3).

Tighten
Tighten the clamps (2), (5), to 3 N·m (27 lb in).

Refer to the

Notice: 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.

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9. Install the negative battery cable. Refer to Battery.