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Idle Air Control (IAC) Valve: Installation

  1. Check the extended distance of new IAC before installing. Damage will occur if measurement is incorrect. Distance must not exceed 1 1/8" (28 mm). Measurement should be taken from valve housing flange to end of cone. DO NOT  extend or retract pintle on IAC valve that has been in service, or damage to internal worm drive may occur.
  2. To retract pintle on new IAC, slowly exert finger pressure on valve. Install new "O" ring or gasket on valve. Coat "O" ring with oil. Install IAC valve. Tighten IAC valve to specifications. See TORQUE SPECIFICATIONS  table at end of article. Install electrical connector.
  3. To reset IAC valve on 2.3L (VIN A), connect "Scan" tester. Start engine and hold engine speed at about 2000 RPM. Using "Scan" tester, select Field Service mode for 10 seconds then exit from Field Service mode. Turn engine off, then restart engine and check for proper idle operation.
  4. On 2.3L (VIN D), turn ignition on, but do not start engine. Ground ALDL connector for 5 seconds. Remove ground from ALDL connector. Turn ignition on for 10 seconds. Start engine and check for proper idle operation.
  5. On 3.1L & 3.4L, turn ignition on for 5 seconds, then turn ignition off for 10 seconds. Start engine and check for proper idle operation.
  6. On 3.3L, turn ignition on, but do not start engine. Ground ALDL connector for 5 seconds. Remove ground from ALDL connector. Start engine and check for proper idle operation.
  7. On 5.7L (VIN 8), depress accelerator slightly. Start and run engine for 5 seconds. Turn ignition off for 10 seconds. Restart engine and check for proper idle operation.
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