its funny cuz i just replaced all the tensioners 8 months ago.i replaced just about all of my timing components due to the fact my tensioners got old and the chain wore a hole in the side of my timing cover.i never hammered my car once and i bought it new and never had any knocking before.
mine used to click, I think you may be hearing the same thing. actual knocking you would hear from inside the car. I didn't worry too much about mine, it never became a problem. I think the lifters make a little bit of noise.