Mine sounded the same metallic noise and thought it was the alternator. I changed the alternator and it was still there. The belt tensioner on mine went bad on the spring part and not on the pulley bearing. Whenever the tensioner moved, it made a metallic noise. I replaced the whole tensioner assembly. __________________ 1996 Ti 280k miles and still going.... 1993 964 - holding on to this one 2001 Burban, 240k miles 2018 Suburban Z71 |