Left Turn Singing
 

The title seems strange, but I don't know how else to say it. Whenever I coast through a left turn while applying just a wee bit of power, something in the front right of the car sets up a harmonic.

If this were happening while braking, I would suspect wear sensors on the brakes, but its only happening under the circumstances above.

Other ideas (to me) are bearings, and that's bothersome considering some of the other sudden bearing failure stories on here.

Maybe its a belt or a bearing in a pulley that only acts up when the forces are just right?

This set in about a week ago, and has become a little more noticeable lately. Anyone have suggestions of other things to check? Also, if I jack up the car, how do I check for bearing play? I know that rocking the tire will allow you to check ball joints and tierod ends, how do you check bearings?

Rocking the wheel won't show ball joint problems unless you are supporting the lca...

This is pretty close to how I've done it in the past - is it a bad procedure?

How to Check Ball Joints: 7 Steps - wikiHow

That wiki gives more than one way... are you lifting the front of car. Or are you supporting the lca as close to ball joint?

Could be motor mounts. Can you rock the engine by hand?