ParkAvenue 1997-1999

Throttle Body

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Specific to:

Buick LeSabre 1986-1999

Buick Park Avenue 1996-1999

Oldsmobile 88 1992-1999

Oldsmobile Delta 88 1986-1988

Oldsmobile LSS 1996-1999

Pontiac Bonneville 1987-1999

The throttle body is located at the front or side of the engine, and is mounted to the intake plenum.

Removal & Installation



3.0L & 3.8L (VIN 3 & B) Engines

Specific to:

Buick LeSabre 1986-1999

Buick Park Avenue 1996-1999

Oldsmobile 88 1992-1999

Oldsmobile Delta 88 1986-1988

Oldsmobile LSS 1996-1999

Pontiac Bonneville 1987-1999

  1. Disconnect the negative battery cable.
  2.  
  3. Drain the coolant into a suitable container, until the level is below the throttle body.
  4.  
  5. Remove the air inlet duct.
  6.  
  7. Tag and disconnect the vacuum hoses and the coolant hoses from the throttle body.
  8.  
  9. Detach the Idle Air Control (IAC) valve and the Throttle Position (TP) sensor electrical connectors from the throttle body.
  10.  



Click image to see an enlarged view

Fig. Location of the throttle body electrical and vacuum connections

  1. Remove the throttle and the cruise control cables.
  2.  
  3. Unfasten the mounting bolts, then remove the throttle body from the vehicle.
  4.  
  5. Remove and discard the throttle body gasket. Thoroughly clean the gasket mating surfaces.
  6.  



Click image to see an enlarged view

Fig. Exploded view of the throttle body - 3.0L and 3.8L (VIN 3 and B) engine shown

To install:

  1. Position a new gasket, then install the throttle body over the gasket. Secure with the mounting bolts.
  2.  
  3. Attach the throttle and cruise control cables to the throttle body.
  4.  
  5. Attach the TP sensor and IAC valve electrical connectors to the throttle body.
  6.  
  7. Connect the coolant hoses, and the vacuum hoses, as tagged during removal.
  8.  
  9. Install the air inlet duct.
  10.  
  11. Fill the cooling system to the proper level.
  12.  
  13. Connect the negative battery cable.
  14.  

3.8L (VIN C, L, 1 And K) Engine

Specific to:

Buick LeSabre 1988-1995

Buick Park Avenue 1996-1999

Oldsmobile 88 1992-1995

Oldsmobile Delta 88 1988

Pontiac Bonneville 1988-1995

  1. Disconnect the negative battery cable.
  2.  
  3. Position a suitable drain pan under the radiator, then drain the coolant to a level below the throttle body.
  4.  
  5. Remove the air inlet duct/tube.
  6.  
  7. For 3.8L (VIN 1) engines, remove the accelerator control cable bracket.
  8.  
  9. Disconnect the throttle, throttle valve and cruise control cables.
  10.  
  11. Tag and detach the IAC, TP sensor and MAF sensor electrical connectors from the throttle body.
  12.  
  13. Unfasten the nuts or bolts securing the throttle body to the intake manifold, then remove the throttle body assembly.
  14.  
  15. Remove and discard the throttle body flange gasket. Thoroughly clean the gasket mating surfaces.
  16.  



Click image to see an enlarged view

Fig. Throttle body assembly - 3.8L (VIN C, L and 1) engines



Click image to see an enlarged view

Fig. Make sure to note the vacuum line and electrical connector locations before disconnecting them

To install:

  1. Position a new gasket on the intake manifold flange. Position the throttle body over the gasket. Install the retaining bolts and tighten to 11 ft. lbs. (15 Nm).
  2.  
  3. Attach the MAF sensor, TP sensor and IAC valve electrical connectors.
  4.  

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

  1. Connect the throttle, throttle valve and cruise control cables.
  2.  
  3. If removed, install the accelerator control cable bracket.
  4.  
  5. Install the air intake duct/tube.
  6.  
  7. Connect the negative battery cable, then refill the cooling system.
  8.  

Specific to:

Buick LeSabre 1996-1999

Buick Park Avenue 1996-1999

Oldsmobile 88 1996-1999

Oldsmobile LSS 1996-1999

Pontiac Bonneville 1996-1999

  1. Disconnect the negative battery cable.
  2.  
  3. Position a suitable drain pan under the radiator, then drain the coolant to a level below the throttle body.
  4.  
  5. If necessary, remove the fuel injector sight shield.
  6.  



Click image to see an enlarged view

Fig. On some vehicles, you have to unfasten the retainer, then remove the fuel injector sight shield

  1. If equipped, unplug the IAT sensor electrical connector from the IAT sensor. Remove the air inlet duct/tube.
  2.  



Click image to see an enlarged view

Fig. If equipped, unplug the IAT sensor electrical connector (1) from the sensor (2) mounted in the air intake duct

  1. Detach the IAC valve, TP sensor and MAF sensor electrical connectors.
  2.  
  3. Remove the accelerator control and cruise control cables from the throttle body lever and bracket.
  4.  
  5. Remove the electrical harness retainer clip from the accelerator control cable bracket.
  6.  
  7. Tag and disconnect the vacuum lines from the throttle body.
  8.  
  9. For the 1996-97 3.8L (VIN K) engine, remove the throttle body support bracket.
  10.  
  11. Unfasten the nuts and bolts holding the throttle body to the intake manifold using a wrench on the manifold side of the inserts to prevent the inserts from rotating in the manifold casting.
  12.  
  13. Remove the throttle body assembly.
  14.  
  15. For 1998-99 engines, if replacing the throttle body, remove the accelerator control cable bracket.
  16.  



Click image to see an enlarged view

Fig. If replacing the throttle body, you must transfer the accelerator control cable bracket to the new throttle body


WARNING
Do not use solvent of any kind when cleaning the manifold and throttle body mating surfaces, as this will damage the surfaces. Also, be careful not to gouge the mating surfaces if using a sharp object, such as a gasket scraper to clean the surfaces.

  1. Remove and discard the gasket, thoroughly clean the intake manifold and throttle body gasket mating surfaces.
  2.  



Click image to see an enlarged view

Fig. Exploded view of the throttle body mounting

To install:

  1. On 1998-99engines, if installing a new throttle body, install the accelerator control bracket and tighten the retainers to 7 ft. lbs. (10 Nm).
  2.  
  3. Position the new gasket, and new inserts and studs, if necessary.
  4.  
  5. Install the throttle body assembly and secure with the retaining nuts and bolts. Tighten to 2 ft. lbs. (5 Nm).
  6.  
  7. Attach the accelerator control and cruise control cables to the accelerator cable bracket at the throttle body. The throttle should open freely without binding between full closed and wide open throttle.
  8.  
  9. Attach the accelerator control and cruise control cables to the throttle body lever.
  10.  
  11. Check for complete throttle opening and closing positions by operating the accelerator pedal. Also, check for poor carpet fit under the accelerator pedal.
  12.  
  13. Install the electrical harness retainer clip and harness to the accelerator control cable bracket.
  14.  
  15. Connect the vacuum lines to the throttle body, as tagged during removal.
  16.  
  17. Attach the IAC valve, TP sensor and MAF sensor electrical connectors.
  18.  
  19. If removed, install the fuel injector sight shield.
  20.  
  21. Install the air intake tube.
  22.  
  23. Connect the negative battery cable, then refill the cooling system.
  24.  

 
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