Hello and firstly let me thank the person who started this place, it has been extremely useful in the past, but on this issue I can not find any other posts. I bought this mpv about 2 months back and it has always had this issue which can be drowned out by level 1 on the radio which can give you an idea of how loud it is. It can only be described as some form of feedback, the kind you would expect to hear if a suppressor was not fitted on a radio, but it is still prominent even with the radio off. It also increases and decreases with acceleration, and a new auto gearbox was fitted a few months back, not sure if that is relevent. Adding to the decription a little further, if you have ever heard a kind of whistle/high pitced noise that comes through a mobile phone conversation, when someone is driving but silent, that would pretty much sum it up. Thanks in advance. riz. 2.3 ghia - S reg - auto - petrol