Zoltan, is this a Temp II sensor?  Cold idle is also a iffy one, while
is true the iSV is the device, It can't really offset a bad Temp II. And
just to say so, I recently purchase a Temp to that worked perfectly ,
but was about 30 ohms off and gave me a overly rich cold start.

I found this by dunking several I have in hot and cold water and timing
the the change to stable and noting final begin and ending values.

Mark