The Location of the Knock Sensor of a 1993 Chevrolet K5 Blazer

The knock sensor on the 1993 Chevrolet K5 Blazer tells the computer when there is pre-ignition -- a pinging or knocking in the engine -- so that the computer can make adjustments to the timing. If a malfunctioning knock sensor is not replaced, the truck will have high emissions, you will hear the pinging -- or if pre-ignition is really bad, a knocking -- and the vehicle will have poor gas mileage. The engine light will come on. If you leave the malfunctioning knock sensor in long enough, internal engine damage will result.

Instructions

1. Open the hood.

2. Locate the round sensor with one wire on the front of the engine, near the top, in the head.

3. Note that the sensor has a round body, with a hexagon-shaped piece near the middle of the sensor. The hexagon part allows you to unscrew the knock sensor from the head, using a wrench.