I think I finally found what the sensor on the back of the block is for, should be the knock sensor. There is none on the Si D16A6. Is there only a knock sensor on vtec equipped motors? I guess that would make sense...
Problem is, somebody tried to disconnect it and broke the solder inside. Sensor is 100$ at Honda dealership. I'd probably try it this way (broken but in place), but I have a feeling its gonna cause some crap later.
Any ideas? solutions?
Thanks