Originally Posted by
focii dan nick
i would say its not the iacv as this is for when the clutch is pressed or idle, to let air pass the throttle body, commonly making the car stall and not idle if this is faulty.
as you accelerate you open the butterfly valve/throtle body to let air feed the engine when idle the valve is closed so no air to make the bang.
i cant see it increasing the revs
The ISCV can increase the revs if it is told to do so as in this case but as I said above I am with you, I doubt it's the ISCV itself!
To OP revs should not raise when coasting with clutch disengaged, I only know it when coasting with clutch released, I think it has to recieve both VSS and clutch input signals to raise idle speed.
Martin