did the usual clean out and stuff and no joy,a few years back it used to do the same intermitantly and i would disconnect it,then reconnect back up after a maybe a week and all would be well ,but something is telling the iscv that either the engine is under load or its still cold,and i know the temp sensor is ok,the valve should modulate in opperation and it never really stays in the same spot for long,but mine is full whack open,we need the ecu guru,s