ssh..ssh...ssh from under center of car?
Looking for suggestions. 2004 325xi 5 speed, 177K miles has recently started making an odd noise. Seems to be coming from under the center of the car, varies with road speed and not engine speed. Happens with clutch in or out.
It's a light "sssh" noise. If I were guessing I'd say it sounds like something metal had come loose (exhaust heat shield?) and was resting against the driveshaft, except that it doesn't happen all the time.
It does it probably 70% of the time, but I haven't been able to related anything to when it does or doesn't happen. It sometimes goes away for days at a time, then comes back. It doesn't seem to be getting worse (louder), but I'd rather not wait until it does to figure it out.
Any suggestions? I haven't had a chance to get it on a lift yet, but hope to in the next week or so?