This is what occurred to me while reading this thread.

I know that in some cars the power steering will demand more from one side on severe turns than the other. But the info we have so far is still not enough to make a definitive call, IMO.

Let me ask you this, cvc...did this just start happening for sure or is it possible it has been a regular occurance that you are just now noticing due to all the work you've been doing lately and your increased awareness of what is going on?

there are 2 things it can be

1 - strut bearing on the opposite side.

2 - (don't laugh or popo this) try popping open your hood, then do whatever you do to make it squeek. I bet it doesn't. Hood latch.

not a strut bearing it stops when you turn the key off, that eliminates that Il try the hood but again it stops whne the key is off, probably not that either. I cant tell if it just started as I just bought the car from a dealer in NJ but I drove it 300 miles plus home with no problemsbut I did notice the noise sometimes. It doesn't have to be a severe turn it can be a gradual sweeping curve in the road an you hear it. Im wondering if the belt moves slightly over an area of that shine detail crap and maes the noise but the belt shouldn't move and there is no sign of rubbing. Im gonna try jacking the car up and see if it does it in the garage. i may try taking the belt off but I bet it stops then...Someone will come up with it I HOPE !

Cheetah did find some broken bolts that should hold the rack to the subframe.. I wonder if that might be a contributing factor.

update, took off the belt same noise, dampener pulley sems tight and I cant see anything rubbing on or near it. Could it be some kind of pump or something in the tranny ? It shifts fine and fluid and filter are fairly new fluid looks good. It almost sounds like a brake squeeler noise that hits once every time around the faster you go the faster the noise,shut off key noise is gone. Running straight or vering or turning left its quiet. Its only when turning right like the motor is shifting and the dampner is rubbing a pc of metal or plastic but it makes no sense...

got it I think, i will post back after some work

grab a beer and put your feet up and listen to this; well I jacked it up in the garage again and it was quiet, took off the belt and drove in a circle it still made the same noise and stopped when you shut the key off. So... I brought it back in the garage and jacked up just the drivers side and started it,no noise. Did the same on the passengers side and there she was same noise. I put jack stand under her and listend by the crank pulley, quiet. Traced the noise over to where the tranny bolts to the motor. Shut it off and took off the inspection flywheel cover and checked the flywheel for cracks or whatever and checked the bolts, all tight. So... I resorted to my fishing buddy who runs a tranny shop.. He had me place the phone near the nosie and asked me how and when it did it etc... Then he said "put the phone right where the noise is comming from ( I know im getting to the answer ) then he said " drop the starter I think you have a bad starter drive spring/arm and its letting the drive slide toward the flywheeel when you jack it that way or turn" I figured this was a long shot at best, low and behold he nailed it dead on !!!
Changed the starter, problem gone !! I could not fricken believe it it sounded like something in the base or tranny or the passengers side wheel, who woulda thunk it ! Thanks fellas for the ideas this one goed in the record book I would say !

Wow!

I don't believe I would ever have come up with that, but great diagnosis! It helped that you stuck to it and used common sense to work to a solution.

Also, thanks for posting the resolution, as it might help someone here in the future.

I have the EXACT same issue as CVC on my 1999 Buick Park Avenue, Naturally Aspirated. It is a starter related issue. Also turns out it'* not just a Bonneville/Park Ave thing. Here'* a fix I read:

Method: Replaced Starter
Description: Metallic rattle noise when turning right only. Took flex plate shield off and found starter drive broken and rubbing against flywheel. Replaced starter.

Vehicle: 1999 Buick Lesabre 3.8L