Its a concern that you think a group of 'on the spectrum' internet car nerds can remotely diagnose your issue from the description you have given.
Describe the noise. Is it a clunk, a click, a bang, a squeak, a moan, a groan, a squeal, a roar, a rattle, a clatter, a jangle, a crash, a din.
Or is it more of a gentle knock.
Now I've got visions of someone hooking up an external speaker to play Alexis_Texas.wav every time they shift upa moan