Chirrpping S2000

[RedCabbage]

Since I first had the car I was aware of a very slight whilstly chirp which lasts only a second when I first put my foot on the throttle to accelerate from cruising speed. It sounds a little like an induction leak to me but I wondered whether this was one of those 'they all do that sir' characteristics.

There are no running problems with my car apart from occasional kangerooing when at low revs in heavy traffic, which is attributed to under bonnet heat build up. I am aware of MAP sensor issues on these cars but don't think mine suffers.

Any thoughts?

[RedCabbage]

I'm sure heat soak is potentially an issue but tightening up the throttle cable as suggested on s2ki worked wonders on the throttle response.