I have a 98 malibu with 107k miles of which i have done a complete overhaul, It started with a whining noise,I t was the power steering pump. After replacing with a reman pump it still had a noise, So I bought a new Ac delco pump and installed it by the book. I then bought a new AC delco alternator, replaced both idler pulleys, replaced the tensioner, ac delco water pump, serp belt , new Bosch platinum plugs, all new fluids including the power steering, motor mounts, struts brakes and tires. I did everything by the book and used the torque wrench on every nut and bolt. The car is definately running smoother and better but, I still have a whining noise which starts at about 1700 RPM to 2200 RPM, its annoying! what else is there, I have replaced everything with a bearing that turns, its louder at night, Any suggestions? I used all OEM parts.

Does it increase with speed? (Wheels or drivetrain issues).

Does it increase with speed? (Wheels or drivetrain issues).
Yes, but when its in park and you open the hood and put a tuning device on the alternator bracket or alternator itself, Thats seems to be where the noise comes from. Its louder when the engine RPMS are up, Its even louder when in drive.