S&T Series Blazer, Bravada, Envoy, Jimmy, Rainier, Trailblazer, Xtreme

Idle Air Control (IAC) Valve

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Removal & Installation




NOTE
This procedure is only for installing a new IAC valve. If installing a new IAC valve, replace the IAC valve with an identical part. The IAC valve pintle shape and diameter are designed for the specific application.Measure the distance between tip of the IAC valve pintle and the mounting flange.If the distance is more than 28 mm (1.1 in), 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.



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Fig. Measuring the IAC valve pintle

To install:

  1. Lubricate the IAC valve O-ring (3) with clean engine oil.
  2.  
  3. Install the IAC valve assembly (2).
  4.  
  5. Install the IAC valve attaching screws (1). Tighten the screws to 27 inch lbs. (3.0 Nm).
  6.  
  7. Reconnect the IAC connector.
  8.  
  9. Use the following procedure to reset the IAC valve pintle position.
  10.  
  11. Turn ON the ignition, with the engine OFF.
  12.  
  13. Turn OFF the ignition for 10 seconds.
  14.  
  15. Start the engine and verify the correct idle operation.
  16.  

  1. Remove the electrical connector (1) from the IAC valve (4).
  2.  
  3. Remove the IAC valve attaching screws (2) from the idle air control valve (4).
  4.  
  5. Remove the IAC valve from the throttle body.
  6.  
  7. Remove the IAC valve O-ring.

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    Fig. Identifying the components for removing the IAC Valve



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    Fig. Showing the IAC Valve and O-ring



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    Fig. Remove the IAC Valve attaching screws

  8.  

To install:

  1. Install the new IAC valve O-ring.
  2.  
  3. Install the IAC valve (1) into the throttle body.
  4.  
  5. Install the IAC valve attaching screws (2) into the IAC valve. Tighten the IAC valve attaching screws to 3 Nm (27 inch lbs.).
  6.  
  7. Install the electrical connector into the idle air control valve.
  8.  
  9. The powertrain control module (PCM) will reset the idle air control valve whenever the ignition switch is turned ON, then OFF.
  10.  
  11. Turn the ignition switch ON.
  12.  
  13. Turn the ignition switch OFF.
  14.  
  15. Perform the IAC Valve learn procedure.
  16.  

2.4L Engines
  1. Remove the idle air control (IAC) valve connector.
  2.  
  3. Remove the IAC valve attaching screws (1).
    NOTE
     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.

  4.  
  5. Remove the IAC valve assembly (2).
  6.  
  7. Clean the IAC valve O-ring sealing surface, the pintle valve seat, and the air passage.
  8.  

Testing



IAC Valve Learn Procedure
  1. Start and idle the engine for 15 seconds.
  2.  
  3. Turn the ignition switch to the LOCK/OFF position.
  4.  
  5. Wait 15 seconds.
  6.  
  7. Restart the engine, and check for proper idle operation.
  8.  

 
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