Hi Guy's new here!

I've recently bought a 1.6 SXI Sport hatch and have started to hear a strange hissing/squeaking noise coming from the from of the car somewhere, it only happens when the accelerator is pressed to a certain point, any more or less it stops. If its held at that point it will be continuous, but as I say its just at one point.

Would be gratefully you could give me some ideas.