To find it, you'll need to:
1. Consult a repair manual: A repair manual specific to your year and model Chevy truck or SUV is the best resource. These manuals will have diagrams showing the exact location of the knock sensor.
2. Use an online parts diagram: Many online auto parts stores (like AutoZone, Advance Auto Parts, etc.) have online diagrams. Enter your vehicle's year, make, model, and engine size, and you should be able to find a diagram showing the sensor's location.
Generally, the knock sensor(s) on a 5.3L Chevy are located on the engine block, often near the cylinder heads, but their precise position can vary. They are usually threaded into the block and are relatively small.
Without knowing the specific year and model of your vehicle, a more precise answer isn't possible.
