What does a knock sensor for 1991 Chevrolet Camaro 305 look like?

A knock sensor for a 1991 Chevrolet Camaro with a 305 engine is a small, cylindrical device, typically about 1-1.5 inches long and less than an inch in diameter. It's usually metallic (often steel or aluminum) and has a single wire connected to it. It might have a small threaded portion for mounting directly into the engine block.

There isn't a single definitive visual description because different manufacturers may have slightly varying designs, but the common features are its small size, cylindrical shape, metallic construction, and single-wire connection. It's not a large or visually striking part. You'll need a repair manual or parts diagram specific to your 1991 Camaro 305 to identify its precise location on the engine block. A picture search online for "1991 Camaro 305 knock sensor" may also yield helpful visual examples.