1991 k1500 350 4x4 automatic

There's something located on the passenger side of the engine block, just above the oil pan, near the starter. It looks like it's a sensor and it's got a wire and a connection that attaches to it. At first I thought it was the oxygen sensor, but it's not located on the exhaust.

Anyone know what it is? I broke part of the connection when I was swapping out my starter and I'd like to find the right replacement.

 

Can you post a pic?

 

Knock sensor.

 

Agreed.....its a Knock Sensor

 

Thanks. Guess I'd better replace the connector piece so it doesn't send wrong signals.