This is caused by deterioration of the Fluid in the rear differential of the car. This occurs when the rear end is opened at its extremes at first and will progressively get worse to the point where it will make the noise all the time while driving. First the fluid in the rear end needs to be changed, and replaced with the appropriate Honda fluid (either vtm 4 fluid or dual pump fluid depending on model) if the doesnt immediatley fix the problem, there is a burnish procedure that your local honda dealer can perform for you which involves changing the fluid and cleaning the clutches inside the rear diff. Good luck!
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It sounds like the inner liner of one of your wheel wells has come loose and is touching the wheel. This would make a sound while moving, but not while stopped. Look inside your wheel wells for the plastic lining that goes all the way around the tire. Look for wear signs. It may even be a hole by now. If you see wear, tug on that wheel well liner to see if it is loose. If so, get replacement screws to hold it in place.
That would explain rumble sounds, high pitched sounds, changing sound when hitting bumps. And it would not affect any dynamics.
The creaking and groaning when car is turned off is a different animal. Possibly something to do with A/C which is depressuring after the car is turned off. To determine if that is the case, see if it makes the same sounds if you've been driving with the A/C off? If not, it's A/C related.
I would start by inspecting the tire and wheel well for any physical contact. Outside of that, is sounds like a wheel bearing. A failing wheel bearing or a bearing with a flat spot will groan and sometimes mimic the sound of mud tires. A flat spot can be causes by even a slight impact the the wheel.
fords famous power steering pump design its common if you replace the pump with a rebuilt one there is a paper with the new pump that warns you of this noise for about 500 miles after installing hope this helps
There is a very good chance if the air/con is on and the v.belt is slightly loose,it would cause the sound.The power steering pump is on the same v,belt.Check the belt tension.If its ok you can buy a spray that makes the belts stickier.Its a v.belt or fanbelt spray.This will be the problem.Hope this helps
The fluid in the versatrakAWD in the rear is old and needs to be drained and refilled. After you drain and refill it, make a bunch of sharp left and right hand turns, then drive it for 10 minutes. Drain and refill it for the second time and problem solved. Use only versatrak fluid available at any GM dealership. There is TSB on this now at the Buick dealership.