I found that my knock sensor was never hooked up and I am getting a code 23. I wired one up and plugged it into the broken one I have in the block and the car would not rev past 4k.
There is a loud ticking coming from that area, and I was thinking maybe the knock sensor is not able to get rid of it so that is why I can here it.
I thought it was a valve so I checked them all and checked the lash and there fine. It also does not tick all the time, and if you rev it and it was the valves smacking you would here it.
I also have this plug left over and no home LMK if you know what it is????
