Hi

Can any one help please, My mate has a 2.5L classic it is hunting on idle, we have tried countless idle control valves on it and every disconected the idle control and it still does it, it flutuates at from about 800 to 1500 rpm.
We are beginning to draw a blank as all pipes and hard pipes have been checked for leaks, it is also using more fuel than usuall,

Any advice will be very welcomed.
thanks
Brad

 

Possibly a maf related issue, if your sure there are no air leaks.

 

have you changed induction kit to a larger diameter unit and not change the MAF scaling?

 

sorry should have said, Mafless running autronic ecu

 

It needs proper mapping then.

 

it was running fine @ 460bhp and all of a sudden created this problem,

 

What AFR's are you getting at idle? I also have an Autronic PnP in my S202 and it only idles smooth at 13.0 - 13.5.