I am getting a "boing" noise from the right rear of the under carriage. It tends to be more pronounced when coming to a stop or starting but does show up over rough roads or bumps. Sounds like a spring catching on something and then breaking free making the "boing" noise.

I have gotten underneath the car, checked the exhaust, looked for loose or worn busings, spring is solid and not rusted anywhere, and I can't seem to locate it...

Any ideas..

2000xc 140kmiles