The older 350-cubic-inch SBC (small-block Chevy) engines -- pre-1980s -- do not use knock sensors, since the engines are not fuel-injected. Newer engines -- engines from the 1980s and up -- that have fuel injection might use one or two knock sensors. The 350ci small-block Chevy engine uses two knock sensors, one on each side of the block. The knock sensor sends a signal to the computer when the engine starts to ping because of wrong air-to-fuel mixture. The computer uses the signal to adjust the mixture.
Open the hood of the vehicle.
Stand by the passenger's-side fender to locate the passenger-side knock sensor. Look on the block, just below the head, directly in the middle of the block. The knock sensor is screwed into the block.
Stand by the driver's-side fender to locate the driver's-side knock sensor. Look on the block, just below the head, directly in the middle of the block. The knock sensor is screwed into the block.
