For nearly a week now I have been getting this very odd "whhhhooooch!" sound from under my car.... seems like it's from under the drivers seat/front driver's side of motor.
I can't for the life of me figure out what is causing it. I have the OEM BOV on and it looks in good shape, so I don't think it's that.
Plus the sound is coming from under the car/front end.
Nothing in specific causes it, which is quite strange. It's pretty random. It happen once in a while while the car is idling, but it's rather quiet. It can happen upon acceleration, deceleration, when just cruising, etc... It tend to be the loudest when I am just cruising. Sometimes a really loud one will cause the car to EVER SO SLIGHTLY jerks. Enough that I can feel it, but not terribly noticeable. I was thinking a boost leak, or leak in the vacuum hose, but it does not occur under boost regularly.
My buddy who heard the sound while the car was idling says he thinks it's the AC compressor or a bad pulley
I changed the AC compressor belt recently though and the pulley seemed fine. Drive belt is still stock though.
2002 WRX w/ 97k miles, stage 4.
(this all started occurring about a week after getting a new suspension put in, but I can't imagine that strange sound would come from the strut or anything). Probably a coincidence.