Removal (4.2L)
WARNING: This page is about a different car, the 2003 Oldsmobile Bravada, 2003 GMC Envoy XL, 2003 GMC Envoy, and 2003 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
Raise and support vehicle. Disconnect Crankshaft Position (CKP) sensor harness connector. See Figure. Remove CKP sensor retaining bolt and CKP sensor.