Y'know, looking at the image you posted, that tensioner is so far to the left that it's almost disengaged from the pin. Got to ask, have you checked both tensioner & belt to ensure they are the correct items, that belt looks almost too long, when I fitted one last week it was almost touching the idler side untill i tensioned it.IF you loosen the camshaft sprocket bolt you can Turn the sprocket independently of the camshaft so that wont Be the problem..
I think you'll find the camshaft sprocket is keyed to the camshaft, it isn't free to rotate. The wheel which is read by the camshaft position sensor is built into the back of the sprocket, so the sprockets position relative to the camshaft must be fixed so the ECU can know the true position of the camshafts.OK, i Will rotate the camshaft sprocket a bit so ive got less slack.. Although i cant see why this would Be a solution for my tensioner problemen..