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I fought that battle with my 87 245. tried everything that you tried. when I replaced the temp sensor, the problem was immediately solved. (of course, many things cause a high idle, but in this case the temp sensor seemed to be my problem.)
It is a Sat morning job. Might as well go ahead and remove the throttle body (again). If you reach over and down you can get a deep well socket (19mm?) on the unit and get it out fairly easily. Use 6 point deep well if you have it. Easy does it.
Be certain you understand how the connector snaps onto the unit before you try to remove it. Study your replacement unit and you can see how it snaps on there. Go slow and easy. You can't see in there for crap. When you put in the new unit, it may not be aligned exactly like the old one so you have to be able to line the connector up by feel.
Work on the car after it has been sitting all night. You want it cold. I also removed the bottom radiator hose and let about a gallon of coolant out, so removing the temp sensor wouldn't flood the engine compartment.
Hook everything back up, add back your coolant,and cross your fingers. After I did mine, I knew immediately that the problem was solved. perfect idle. There is a schematic in Bentley that shows the relationship between that unit and the entire fuel/idle system.
Dow Ford
1987 245 230,000
2001 XC70 160,000
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