Tip - How to Replace the Knock Sensor in a 1990 Silverado 5.7 | eHow

The 5.7L engine in most 1990 Chevrolet Silverado vehicles uses a knock sensor on the engine block. This sensor tells the engine's computer if the engine isn't getting enough spark, a condition which causes a knocking sound in the engine. The sensor tells the computer to advance or retard the timing accordingly, helping the engine function properly....