CU2 Low speed noisy ??

[yahopjh]

I normally turn on the audio and drive car so , I couldn't hear any noisy

but when I turned off and drive a car then I could hear the sort of valve noisy on

low speed about 30~40 km with 2000-2500 rpm it's kind of valve noisy but I am

not sure it's normal sound of euro or it has something wrong with when I put neutral and

rev up then I can't hear it only low speed or when I go upper hill that need some power

then I can hear same noisy as well , so , please give me some advise if someone has a similar problem

[Fredoops]

what sort of noise? got a recording of it?

[yahopjh]

No I don't have one but it's sort of knocking noisy on low speed ..