Idle Air Control Valve (4.3L): Installation
WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Before installation, clean "O" ring sealing surface, pintle seat and air passage. If air passage has heavy deposits, remove throttle body for complete cleaning. Shiny spots on the pintle or seat are normal and do not indicate misalignment or a bent pintle shaft.
- Inspect "O" ring for damage. Replace as necessary. If reusing IAC valve, DO NOT push or pull on pintle. Threads on worm gear will be damaged.
- If replacing IAC valve, measure distance between tip of new IAC valve pintle and mounting flange. Distance should not exceed 1 1/8" (28 mm). See Fig 1. If distance is more than specified, use finger pressure to slowly retract pintle. Lubricate "O" ring with clean engine oil.
- Apply Thread Locking Compound (1052624) to IAC valve mounting screw threads. Install IAC valve to throttle body. Tighten IAC valve mounting screws to specification. See TORQUE SPECIFICATIONS . Reconnect IAC valve harness connector.
- To complete installation, reverse removal procedure. To reset IAC valve pintle position, turn ignition on for 5 seconds. Turn ignition off for 10 seconds. Start engine and check for proper idle operation. Repeat procedure if proper idle operation is not obtained.