The Knock Sensor detects abnormal vibration (spark knocking) in the engine. What you are experiencing is something different. My 88 Calais 2.3 Quad 4 was knocking hard, almost like a lifter knock, but only when it got hot. When I went uphill, it quieted down. I discovered, with the greatful help of GMMerlin, that my timing chain was slapping against the front chain guide. After chaning out the timing chain, guides and tensioner, my engine runs great.