Removal (3.1L & 3.4L)
WARNING: This page is about a different car, the 2002 Pontiac Grand Prix, 2002 Chevrolet Monte Carlo, 2002 Chevrolet Impala, 2002 Buick Regal, and 2002 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
Turn OFF the ignition. Raise and support the vehicle. Disconnect the wiring harness connector from the knock sensor. See Figure. Remove the knock sensor from the engine block.