Whirring noise; Please help

[ExTex]

Can anyone estimate cause of an intermittent buzzing-whirring sound?

'95 Subaru Legacy Wagon, AWD, Auto. transmission, anti-lock brakes. Only
59,000 miles and excellent repair record.

PROBLEM: Sounds like tire tread noise on pavement, rather high-pitched.
Noise diminishes as car slows and ceases when it stops. It is intermittent,
no way to estimate when it will occur. Tires properly inflated.

All fluids have been checked at time of recent service. Uses no oil. Plan
to change transmission fluid next oil change. Always carefully maintained.

Thanks in advance for a pro's best thinking on subject.

hd

 

[nope]

Can anyone estimate cause of an intermittent buzzing-whirring sound?

'95 Subaru Legacy Wagon, AWD, Auto. transmission, anti-lock brakes. Only
59,000 miles and excellent repair record.

PROBLEM: Sounds like tire tread noise on pavement, rather high-pitched.
Noise diminishes as car slows and ceases when it stops. It is intermittent,
no way to estimate when it will occur. Tires properly inflated.

All fluids have been checked at time of recent service. Uses no oil. Plan
to change transmission fluid next oil change. Always carefully maintained.

Thanks in advance for a pro's best thinking on subject.

hd

wheel bearing?

Try dring in gentle left-right curves and listen if the noise follows a
pattern

 

[alex3324]

Agreed. I suppose the OP would have mentioned whether the problem only
occurs when it's wet out. The bearings on my Saab would get very loud and
grumbly when it was raining, but not a noise at all when it's dry.

 

[hippo]

1/ Easiest / cheapest ones first! Eliminate tyres as possibility by
duplicating route 2 - 3 times & see if noise comes & /goes consistently.
If so tyres sound like cause. 2/ Check for foreign material (stick / road
debris fouling a disc, backing plate, driveshaft or tailshaft. That can
sound v. srange AND avoid detection. 3/ Bearing suggestion is a good one.
4/ Have rotors or hubs been replaced / disturbed? If so, try copper grease
on shaft splines then retorque. Else I suppose 5/ could always be fit a 15"
sub and crank up the stereo .... Good luck!