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Home >> Chevrolet >> 2005 >> Chevy Express G3500, Van Passenger Extended >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - 4.8L, 5.3L, And 6.0L - Introduction >> Repair Instructions >> Idle Air Control (IAC) Valve Replacement >> Installation Procedure

Installation Procedure

    Fig 1: Measuring Distance Between IAC Valve Pintle & Mounting Flange
    GM17065Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: If installing a new IAC valve, be sure to replace the IAC valve with an identical part. The pintle shape of the IAC valve and the diameter of the IAC valve are designed for the specific application.
  1. Measure the distance between the tip of the IAC valve pintle and the mounting surface (1). 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 does not cause damage to the valve.
    2. Fig 2: View Of TP Sensor, IAC Valve & Components
    GM356448Courtesy of GENERAL MOTORS CORP.
  2. Lubricate the IAC valve O-ring (2) with clean engine oil.
  3. Install the IAC valve O-ring (2) on the IAC valve (3).
  4. Install the IAC valve (3).
  5. Apply LOCTITE 262 to the IAC valve attaching screw threads if necessary.
    NOTE: Refer to Fastener Notice in Cautions and Notices.
  6. Install the IAC valve attaching screws (4).

    Tighten:  Tighten the screws to 3 N.m (27 lb in).

    7. Fig 3: View Of TP Sensor & IAC Valve Electrical Connectors
    GM389028Courtesy of GENERAL MOTORS CORP.
  7. Connect the IAC valve electrical connector.
  8. Install the generator. Refer to Generator Replacement (4.8L, 5.3L, and 6.0L) in Engine Electrical.
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