Without knowing the type of noise and source, it would be impossible to diagnose or provide any information as to what might be causing the noise.
It would be best to get a physical inspection done to verify the source.
Off hand I can think of a few causes but they are completely different in nature.
1. Exhaust leakage.
2. CV shafts.
3. Engine emission related.
Wednesday, February 18th, 2009 AT 3:28 PM