Join Date: May 2009
Location: east coast
Car: OBW H6 VDC, Tribeca, XT6
Feedback Score: 1 reviews
remember we can't see, drive, hear, touch, or otherwise diagnose *at all*, so while we have more collective experience than any Subaru dealer in the world.....we're really limited in what we can do on a forum as well.
if it was exhaust i would expect it should be noticeable if you were standing outside the vehicle and someone revved the motor while in neutral/park. try that first.
when it's revved up in neutral - park what does it do? any sounds then?
are you positive it never made this sound before the headgasket repair?
sounds like you have driven it some miles, sometimes the HLA's, if yours is so equipped, take some time to prime and quiet down after a head job. have you changed the oil since the HG job?
after that we'll need to know more about this noise - it could be the timing belt tensioner flopping around (a tap, tap, tap kind of noise) - this usually happens under load - which would be while driving as you're experiencing.
H6 OBW VDC, H6 OB Sedan, Tribeca, Lifted XT6