Removal (4.3L)
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:
The 4.3L has a single knock sensor.
Turn ignition off. Disconnect negative battery cable. Remove distributor. See DISTRIBUTOR under IGNITION SYSTEMS. Disconnect knock sensor harness connector. Remove knock sensor retaining bolt and knock sensor. See Figure.