Okay what you want to do today I can host this is to take all of the accessory belts off of the engine start the motor and listen for the sound if you don't hear the sound then you know it's your alternator or one of the other accessories the reason you take off all of the belts is to see if it's a timing belt what you would not be able to take off cuz that's inside the motor the only way to diagnose it is to do this.
SOURCE: high pitch tone from my 2001 chevrolet S-10 pickup
You didnt indicate whether you ran the engine with the belt removed while replacing the alternator,if not do so and verify noise. Sounds like you may have a vacuum leak, best way to diagnose would be with a smoke machine if not available with the engine cold try spraying carb cleaner around the intake & any suspect vacuum hoses with engine idling look for a change in idle speed or elimination of noise. Hope this helps you out
SOURCE: humming noise coming from left front tire, just started two days!
If the tires are wearing normal then its not the ball joint. If it worse while turning one way and quieter turning the other way it a wheel bearing. A ball joint does'nt make a constant noise.
SOURCE: high pitch noise coming from under the hood louder
This could be a couple of things. There are bearings in the a/c compressor, alternator and p/s pump. One of these could be going out. There is also a bearing in the belt tensioner and in any idler pulleys connected to that belt setup. Check those first. If that's not it maybe check your fan. There is also a bearing in there.... If it's an electric fan disreguard that part. If it's belt driven see if it spins with the engine off, we don't want to loose any fingers. If the fan clutch is seized up that's an easy fix.
SOURCE: I have a 2005 duramax deciel pickup that has a high pitch squeal.
sounds like u may have a hole somewhere or maybe turbo aint getting enough oil does it sound like a turbine ?
SOURCE: Bearing between drive shafts (Is this the Carrier Bearing?)
Replace the bearing, it's rubber mount and any u joints that are not PERFECT. any little resistance will make vibration, and it only gets worse.
Be CERTAIN to keep the shafts in PHASE or you will be most sorry. Phase realtes to their positioning to one another, precisely.
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