As this is a "noise" related issue, here are the basics:
A. When does the sound happen?
Yes_ When engine is running
Maybe_ When transmission is in some particular gear
No_ When turning
Yes_ On throttle
No_ When braking
No_ Over bumps
Seems Unrelated_ In cold conditions
Yes_ At speed: Higher than 60km/h (40m/h)
B. Where does the sound come from?
C. Does the sound vary with some condition?
Maybe_ Engine/transmission rpm dependent
No_ Wheel rpm dependent
No_ Air speed/direction dependent
No_ Varies according to some other condition
D. Is there a vibration associated with the noise?
No_ Feel it through the floorpan or seat
No_ Feel it through the steering wheel
No_ Feel it through a pedal
This is a 2010 Subbie with CVT, it has 163000 km (~100000 miles), I have owned it for almost 1 year now with no noticeable issue (i.e. this noise) until about a week ago.
Here you can view a recording of the symptom (very brief and the noise is kind of faint because of the wind):
Some details of my own:
-Sounds like an "unwinding" noise, but I could imagine it being from rubber against metal or metal against metal (i.e. inside CVT). The closest sound I can relate is a slow speed wheel lock with no ABS (the screeching of tires for a brief second).
-The problem only seems to happen when above 60km/h (40m/h) usually when it seems the CVT is on a high ratio for cruising at speed.
-The problem only happens for a second (as in the video) and only when I accelerate usually after letting go of the gas paddle just before accelerating.
-My impression is that sometimes (not always) I press the gas, the engine IMMEDIATELY responds to it and revs up, but there's no "traction", then the noise comes and the car pulls forward -- again this all happens so fast it's hard to be sure, but that's my impression anyway.
-The noise and much more frequent a few days ago, it was very hard to get it to do it today (so I could record it) and even then it was just a fraction of how lowd it was a few days ago.
-It does not matter if I have it in "automatic" or "paddle shift" mode - I have had it happen both ways.
-It does not seem to be related to turning in any way.
-It does not seem to be related to the A/C and/or blower.
-I do NOT have any of the other problems mentioned in the forum like issues during the first seconds of the day or putting in reverse.
-The car drives perfect below 60km/h (40m/h) even if I push the gas hard it acts normal. Only seen the issue above those speeds and the car drives "normally" after the "noise".
-No Engine light or Codes to read (I have the OBDII reader).
-Main belt is visually in good shape.
-No signs of leaks, etc.
Taking the car to the dealer for regular maintanance on Friday (10/3) and will show the video, just hoping anyone may have seen/heard of this before so the dealer doesn't talk me into doing something I don't need.