Unveiling the Secrets of Idler Pulley Noise Diagnosis

I'm trying to track down a noise from what I think is coming from an islet pulley or the tensioner pully on the serpentine belt. It's kind of a cross between a ... After tens of thousands of miles of use, the shaft bearings inside the idler pulley become worn causing a vibration that produces a loud noise. Similar noises ... The timing belt got replaced half a year ago by previous owner. Not sure how good the job was done though... I will try out what you said and see if that's still ... Replace entire belt tensioner and might as well replace the idler too. Tensioner is short. Also, aftermarket belts are more prone to noise. A misaligned belt causes a chirping noise as it enters a pulley. In most cases, you can attribute the chirping sound to one of the following issues: Pulley ... Sounds like an idler pulley to me; my Civic made a very similar sound at idle before replacing it. If the bearings in your pulleys go bad, it ... If you hear a chattering, chirping, or squealing noise in the car, it's likely from a bad belt or from a seized or loose bearing in the pulley. I am also experiencing an intermittent rumbling noise at highway speed. There is no vibration in the steering wheel, just a low droning noise. Chirping and squealing can be from a lose belt also. If the belt is even slightly loose - it'll squeak / chirp everytime it slips on the pulley. If the belt is on the engine and the engine is operating there my be a rattling or metal on metal screeching sound.