Hello, I have an R plate S40 T4 and decided to carry out the compulsory IAC valve cleaning out that the phase 1 needs every so often.

Everything is well except when the car is warmed up, the idle is around 1000 revs sometimes around as high as 1200, it is normally around 700-800.

Anyone have any idea why this would happen, anything I can do before I get a new IAC valve for it?

Ta.