Often when this happens there is a worn bearing on one of the pulleys that is causing a slight misalignment, often not even noticeable, if the tensioner is new, I would be looking carefully at all the bearings that carry the belt pulleys and also a close look at the harmonic balance as well, may sure that there is no wobble when it runs.
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Saturday, October 8th, 2011 AT 9:50 PM