, anyway, it's always a common issue when in traffic/ stationary after a bit of a drive in the warmer days. and you have a K&N style filter or induction kit I found similar to this.
it turns out that because there is very little room and no cool air being pushed through the grill or into the induction kit pipes to the filter, all the very hot air from the exhaust manifold rises and is sucked into the throttle. as hot air is at a different pressure to cool air the MAP sensor picks this up as does the lambda sensor as this will show a shift in CO as not enough oxygen to fuel ratio for optimal burning while the throttle is in the closed position (tick over). to correct this the ECU tells the Idle Air Control valve to open up to increase the oxygen levels, down side is it is still drawing hot air so keeps rising. Once the manifold has cooled down enough or enough cool air passes into the engine through driving it eventually corrects itself. or turning the engine off as this resets the IAC valve untill the ECU detects the temp and pressure changes again.
I found the solution to this is to draw cool air from as close to the front as possible, similar to the standard rover mpi air box or have an induction kit like this to draw air from as close to the grill as possible as the usual induction kit pipes only work when the car is moving. This one is on my mate’s mini and gives no idle issues even when the engine is very hot.
I made a similar one for mine to see if it was more the mini than the induction kit and I saw not idle problems, just need to finish the final version for the New Year and see how long it works for before it proves I am wrong lol
hope that is of some help and sorry for the essay style reply!!
Edited by Jay3178, 02 December 2009 - 01:20 PM.
