When I changed my belts, something was making that noise. So, like everyone, I figured it was my tensioner. I checked the auto tensioner and found nothing wrong with it. My uncle, who did my belt change while I watched and helped, is a certified Honda tech (all mfgs, really) and he said this tensioner problem seems to be a little out of proportion. I asked him about the kits to convert it to a manual tensioner and he was strongly against it. He has done quite a few H22 w/auto tensioner belt changes, and seen not one bad. My engine is smooth as silk now with not a hint of grrrring anywhere. Only thing that I could think of was the fact that the old belt was, well, old and wearing out. Just like belts do.