GM Buick/Oldsmobile/Pontiac/Full-Size 1975-1990 Repair Guide

Idle Air Control Valve

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See Figure 1

REMOVAL & INSTALLATION



  1. Remove the air cleaner and disconnect the IAC valve electrical connection.
  2.  
  3. Remove the valve using a 1 1 / 4 in. (32mm) wrench on the hex surface only.
  4.  

To install:
  1. Before installing the new valve, measure from motor housing to the end of the cone. Distance should be no greater than 1 1 / 8 in. (28 mm). If necessary, reduce the distance. On Type 1 valves exert firm pressure on the valve to retract it. On Type 2 valves, compress the retaining spring while turning valve in with a clockwise motion.
  2.  
  3. Install the new idle air control valve to the throttle body; use a new gasket.
  4.  
  5. Reconnect the electrical connector and install the air cleaner.
  6.  
  7. Start engine and allow it to reach operating temperature. The ECM will reset idle speed when the vehicle is driven above 35 mph (56 kph).
  8.  



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Fig. Fig. 1: IAC valve identification

 
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