Removal & Installation (8.1L)
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.
The 8.1L is equipped with 2 knock sensors. See Figure and Fig 1 . Raise and support vehicle. Disconnect Appropriate knock sensor harness connector. Remove knock sensor. To install, reverse removal procedure. Tighten knock sensors to specification. See TORQUE SPECIFICATIONS . Fill and bleed cooling system. See COOLING SYSTEM BLEEDING under COOLING SYSTEM.