Where is the knock sensor on a 1999 3100 Grand Prix?

The knock sensor on a 1999 Pontiac Grand Prix with a 3100 engine is typically located on the engine block, near the rear of the engine, on the driver's side. It's often positioned between the intake manifold and the engine block, close to the cylinder head. To access it, you may need to remove some components like the intake manifold or other nearby parts, depending on the specific layout of your engine. Always consult a repair manual for precise instructions and diagrams.