I recently had to replace the intake on my 97 crown vic. while doing that I noticed there was NO knock sensor in the valley. there was a spot that looked like it should be machined out to have one, but nothing there. also were no wires leading into the valley, I was concerned that it might be in the rear of valley so I looked for wires. only thing there was the coolant tube and there was nothing under that also.
My question is where else would it be, the dealer I bought it off (Ford) could not find any manual reference stating any other location for it.