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

Idle Speed

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ADJUSTMENT



This procedure should be performed only when the throttle body parts have been replaced. Newer models may not provide for this adjustment, as the computer is responsible for idle control.

The following procedure requires the use of a special tool.

  1. Remove the air cleaner and gasket.
  2.  
  3. Plug the vacuum port on the TBI marked THERMAC.
  4.  
  5. If the car is equipped with a tamper resistant plug that covers the throttle stop screw, the TBI unit must be removed as previously described in order to remove the plug.
  6.  
  7. Remove the throttle valve cable from the throttle control bracket to allow access to the throttle stop screw.
  8.  
  9. Connect a tachometer to the engine.
  10.  
  11. Start the engine and run it to normal operating temperature.
  12.  
  13. Install tool J-33047 into the idle air passage of the throttle body. Be sure that the tool is fully seated and that no air leaks exist.
  14.  
  15. Using a #20 Torx bit (0.16 in.-4mm), turn the minimum air screw until the engine rpm is 675-725 with auto. trans. or 725-825 with manual trans. The AT should be in Park, the MT in Neutral.
  16.  
  17. Stop the engine and remove the special tool.
  18.  
  19. Install the cable on the throttle body.
  20.  
  21. Use RTV sealant to cover the throttle stop screw.
  22.  

 
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