1997 Nissan Sentra Rattle

I have a 1997 Nissan Sentra and about 4 months ago it began to make a rattling sound when I turned to the right. I had my u joint replaced and this didn't take care of it, they could not figure it out that day. I took it back, another mechanic looked at it and he couldn't figure it out either. It has continued to make the noise as I turn right. Tonight for the first time it made the noise and a loud unusual noise when I started my car. The normal rattle lingered for a bit, and then stopped. It did continue when I turned to the right. Any ideas?