2002 WRX Wagon, 88k, no significant mods (r sway bar, grounding wires):
It's developed a distinct, fairly high-pitched whine from the front of the engine, 100% synched to engine speed, somewhere down beneath the A/C pulley. The noise is somewhat suppressed below 2,000rpm, but it comes on strong at 2,000 and higher.
It's only really bad when cold. It is much quieter after 20mins or so of driving.
Removing the PS/Alt belt had no effect, I did not remove and test the A/C belt.
I've read some threads about the A/C tensioner pulley making noise, and one about a small brass pulley on the cam belt system. I don't recall their authors stating that the noise goes away once fully warmed up.
It's on its 2nd automatic timing belt tensioner.
>>Has anyone had specific experience with the noise being prominent only when cold? What was the culprit, and how did you solve the problem?