I have a 2007 Chrysler Sebring Touring (V6) with almost 80,000 miles and diligent about repairs / oil changes. As of late, a loud revving sound comes from the engine under all conditions. It’s as though the normal revving you would hear when accelerating or decelerating has been amplified significantly. No check engine light, no shaking or vibration within the car, but under the hood there is some vibration and the noise seems loudest near the belt-side.
Could it be that the alternator or another turning part is beginning to fail and is putting a strain on everything else it’s connected to? Doesn’t matter if it’s starting up, short-distance, long-distance, city or highway, A/C on or off. It’s not getting any louder or softer over time. Full oil - I’m really not sure what’s wrong.