Review on ACDelco 38105 Professional Automatic Tensioner by Darian Massey

at the end of October, but only installed at the beginning of November. Everything worked fine for the first 2 weeks after installation. There was no vibration, noise or heavy shaking from this tensioner. Then, after those first 2 weeks, these problems started to appear. Now it's vibrating a lot and shaking to the point that not only can I feel it in my car, especially when idling, but now it's affecting my other pulleys. I'm giving it 3 stars for now just to see if ACDelco honors its warranty. If not then I'll probably reduce it to 1.