Welp, after a few months, the noise came back with a vengeance today. This morning it was faint, but later on, after my drive home, I went to run some errands. Started her up, and it was louder than ever. I revved the engine, and when it dropped back down it almost died, twice. I noticed that the sound seemed to pulse in time with slight but visible bouncing of the tensioner. Since its only $35, I'm going to pick one up tomorrow and see if I can replace it. Perchance, does anyone know what size torx it takes? I'll have to go down to Sears and buy a set; I want to make sure I get the right range.