GM Celebrity/Century/Ciera/6000 1982-1996 Repair Guide

Idle Air Control Valve

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REMOVAL AND INSTALLATION



See Figures 1 and 2

The idle air control valve is mounted to the throttle body and controls the bypass air around the throttle plate. It is used to control the engine idle speed, to prevent stalls due to changes in the engine load.

  1. Remove the electrical connector from the Idle Air Control (IAC) valve assembly.
  2.  
  3. Unscrew the IAC from the throttle body and discard the gasket.
  4.  

Do not remove the thread locking compound from the threads.

To install:
  1. Clean and inspect the IAC valve O-ring sealing surface, pintle seat and air passage. Do not soak the valve in any liquid cleaner or solvent, this will damage the valve. Use a carburetor cleaner and a parts cleaning brush to remove any carbon deposits. Shiny spots on the pintle or seat are normal and do not mean misalignment or a bent shaft.
  2.  



Click image to see an enlarged view

Fig. Fig. 1: There are three types of Idle Air Control (IAC) valves

  1. If installing a new IAC valve, you will need to measure the distance between the tip of the pintle and the mounting flange. If it is greater than 1 inch (25mm), use finger pressure to slowly retract the pintle.
  2.  



Click image to see an enlarged view

Fig. Fig. 2: If installing a new IAC valve, you will need to measure the distance between the tip of the pintle and the mounting flange. If it is greater than 1 inch (25mm), use finger pressure to slowly retract the pintle

  1. Lubricate the IAC valve O-ring with clean engine oil, then install the valve assembly.
  2.  
  3. Attach the IAC with the mounting screws, tighten them to 27 inch lbs. (3 Nm).
  4.  
  5. Connect the electrical connectors.
  6.  
  7. Reset the IAC valve pintle:
    1. Turn the ignition ON for five seconds.
    2.  
    3. Turn the ignition OFF for ten seconds.
    4.  
    5. Start the engine, then check for proper idle operation.
    6.  

  8.  

 
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