I was able to copy the link. My guess is a valve out of adjustment or broken valve spring hope some of the experts will chime in I'm really bummed out with this noise. I did try to crack each injector to narrow down to a certain cylinder to no avail cannot pin down where its coming from gess next step would be to pull valve cover and check valve adj. I sure hope it did not blow a prechamber down into piston as I lost 1 engine already to that.