This is the knock sensor. It will be on the passenger side of the block under neath the vehicle, there behind the starter. It is screwed into the block...usually at a freeze plug, ther. You will see it, it's the only thing under there behind the starter.
You can check it by hitting the block with an extension to simulate spark knock. If it is working properly, when you hit the block, the idle speed will change. The computer retards the timing to compensate for the noise.
Exactly where I told you it is.
This is an electronic ignition. The spark timing advance is computer controlled. The advance mechanism is the ignition module. If you disconnect it, the engine will not run at all.
The only thing that there is, to control spark timing, is the knock sensor. It has a brown wire going to it......That's it.
To set the timing on this engine is actually at 0 degrees TDC. There are actually no adjustments once it is set. Everything is computer contrpolled.