That would depend on the noise you are hearing! Do you hear somesort of sqeak ?(someparts need to be lubricated) or do you hear a rattle or thump ?(something would be loose and needs to be tighted).It really does depnd on the noise you need to be more specific if you want help or as I allways sugest buy a book for you van at you local parts dealer ($10 to $20) perferably printed by haynes they have a better trouble shooting guide for a novice!
loose or bad u joints.
I would check the suspension bushings, if one of them is worn it would cause a knocking noise.
Not extremely, but it will cause a noise (sometimes) when going over bumps and premature tire wear.
a clunk noise over bumps
Check your sway bar rubbers in the front, there are 4 of them and they will cause a bumping and banging noise around corners and over bumps.
Your shocks are going out. You may also want to replace the springs as well.
could be control arm bushings gone bad
Both ends
Loose, worn, broken tie rods, sway bar links, struts, ball joints,.......
If its a ka thunk sound even on small bumps,Its most likely your STRUT MOUNTS.
Probably a worn out suspension bushing.
Yes, just about any worn suspension bushing or other wearable part can cause that type of noise.