I've been troubleshooting a loud whining noise coming from the timing belt area, and I'm looking for some advice from those with a similar experience.
The noise is constant, whining and high pitched. Increases in pitch with RPM, audible at idle. I've tried using a stethoscope to isolate and haven't had any smoking guns yet. The timing belt appears to be in good shape.
So far, I have attempted, with no change in the noise:
-Removing timing belt plastic covers
-Removing waterpump/alternator/PS pulleys and belts
-Replacing timing belt tensioner and re-timing
-Replacing timing belt tensioner and idler pulley and re-timing
Would the oil pump be the next thing to check? The drive pump sprocket nut does not appear to be loose.
I'll post a video shortly.