I'd like to know too! Mine does the same thing - it makes a rattling noise upon startup that goes away after 30 seconds or so and isn't present while driving or idling.
You might want to have the CV joints checked. When bearings start to go out, they make a "clicking" or "rattling" noise while driving - especially while making turns.
yes it can the ceramic inside of it may have been damaged somehow. usually by having a accident from what i have heard. but my Lincoln does the same thing. its not going to be a major problem as long as you can bear the noise.
Most likeyl cause could be a bad pulley
sounds like the cv joints need replaced
The kids in the back.
bearings old tires shock observers steering wheel
Brakes
Bad wheel bearing
my guess is the lower motor mount
your keys?
Fuel pump