seems like this may be the best place to ask this , my idle is 850 when first started even on a freezing morning , but when warm idles at 1200 , i've had the isv out n soaked it overnight made no difference , is the base idle what needs setting ? is the 13mm nut only visable after the isv valve is removed can't remember seeing it when isv was off for cleaning ? can't see it i'l have a go at that when i get home car will be nice n warm then ?