engine knock

If it was working fine before the tensioner change then i would definitely suspect timing.Did you check the marks,even a small amount of misadjustment makes a big difference on a motor.did the crank or cams get rotated while the belt tension was loose,locate number 1 cylinder and make sure the piston is at top dead centre,then look at your timing marks .hope this helped a little!Why did you have trouble setting the timing?

yes if u set the timing right it will solve this problem. I too had this same problem with my 1990 nissan pickup when the timing was off. Im now changing the timing cain.

adjust the distributer i had the exact same issue. THAT IS 100% YOUR PROBLEM