Make sure the white TDC mark on your crank pulley is lined up with the pointer on the timing belt cover. This is #1 TDC. The hash marks on the cam gears should also be lined up to each other...
If their not lined up,the timing is off.
Also about the tensioner. When you loosen the 14mm bolt,push down on the tensioner pulley so that its at its max "loose" position.While its in this "max loose" position, gently snug the bolt. This makes it easier to put the belt on IMO. Once the belt is in position,loosen the tensioner bolt and you should be good to go...Triple check the cam timing by rotating the engine a few times and checking all the timing marks. These must be correct for the engine to run properly!
Hope this makes sense!