Roadmaster 1992

Heated Oxygen Sensor

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Location



Specific to:

Buick Roadmaster 1991-1996

Chevrolet Caprice 1993-1996

Chevrolet Impala 1994-1996

Oldsmobile Custom Cruiser 1991-1992



Click image to see an enlarged view

Fig. Heated oxygen sensor location (bank one)-1994-1996



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Fig. Heated oxygen sensor location (bank two)-1994-1996

Specific to:

Buick Roadmaster 1991-1993

Chevrolet Caprice 1993

Oldsmobile Custom Cruiser 1991-1992

This component is located on the TBI unit.

Click image to see an enlarged view

Fig. TBI unit and related components-1991-1993

Removal & Installation



  1. Before servicing the vehicle, refer to the Precautions Section.
    NOTE
    Disconnecting the negative battery cable on some vehicles may interfere with the functions of the on-board computer systems and may require the computer to undergo a relearning process, once the negative battery cable is reconnected.


    NOTE
    If working near and/or around the SRS system and components, be sure to properly disable the SRS system. See disarming/arming the SRS system.

  2.  
  3. Disconnect the negative battery cable.
  4.  
  5. Disconnect the IAC valve electrical connector.
  6.  
  7. Remove the IAC valve by performing the following:
    1. On thread-mounted units, use a 1 1 / 4 in. (32mm) wrench.
    2.  
    3. On flange-mounted units, remove the mounting screw assemblies.
    4.  

  8.  
  9. Remove the IAC valve gasket or O-ring and discard.

    Click image to see an enlarged view

    Fig. IAC valve-1991-1993



    Click image to see an enlarged view

    Fig. TBI unit and related components-1991-1993

  10.  

To install:


NOTE
Be sure to use new fasteners, as required.


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 sealer are identified. 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.

  1. Clean the mounting surfaces by performing the following:
    1. If servicing a thread-mounted valve, remove the old gasket material from the surface of the throttle body to ensure proper sealing of the new gasket.
    2.  
    3. If servicing a flange-mounted valve, clean the IAC valve surfaces on the throttle body to assure proper seal of the new O-ring and contact of the IAC valve flange.
    4.  

  2.  
  3. If installing a new IAC valve, measure the distance between the tip of the IAC valve pintle and the mounting flange. If the distance is greater than 1.102 in. (28mm), use finger pressure to slowly retract the pintle. The force required to retract the pintle of a new valve will not cause damage to the valve. If reinstalling the original IAC valve, do not attempt to adjust the pintle in this manner.
  4.  
  5. Install the IAC valve into the throttle body by performing the following:
    1. If installing a thread-mounted valve, install with a new gasket. Using a 1 1 / 4 in. (32mm) wrench, tighten to 13 ft. lbs. (18 Nm).
    2.  
    3. If installing a flange-mounted valve, lubricate a new O-ring with transmission fluid and install on the IAC valve. Install the IAC valve to the throttle body. Install the mounting screws using a suitable thread locking compound. Tighten to 28 inch lbs. (3.2 Nm).
    4.  

  6.  
  7. Connect the IAC valve electrical connector.
  8.  
  9. Connect the negative battery cable.
  10.  
  11. No physical adjustment of the IAC valve assembly is required after installation. Reset the IAC valve pintle position by performing the following:
    1. Depress the accelerator pedal slightly.
    2.  
    3. Start the engine and run for 5 seconds.
    4.  
    5. Turn the ignition switch to the OFF position for 10 seconds.
    6.  
    7. Restart the engine and check for proper idle operation.
    8.  

  12.  
  13. Using the GM diagnostic scan tool or aftermarket equivalent reprogram the necessary systems and components. Be sure to follow the scan tool manufacturer-s directions.
  14.  

 
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