i turned the engine on to hear this fast-paced clicking noise. i took a look under the hood and noticed that the clicking noise was coming from the belt tensioner (the one with the bolt coming out of the center), which was wobbling itself. it sounded like metal on plastic type clicking. the noise only intensifies whenever more strain is put on the belt (i.e. turning on the lights, A/C). i just had the harmonic balancer replaced a couple months ago (just FYI, maybe that affects it?). anyone know the problem and/or any fixes?