Just in case someone wants to know what finally happens.
Problem solved, It was located in the Intake Air System, a misplaced air filter was causing the noise that we finally heard in the dash. Very strange, but the noise disappear.
Two very young guys were required to find the origin of the noise, my friend and me :beerchug: . One pressing the throttle and the another searching where the noise was coming, finally under the hood and not under the dash.
A noise coming from the air intake system give him a clue, we only opened the air cleaner cover and reinstall the Air Cleaner (filter) with care and that was all.
It tooks us only five minutes and a ride in the highway to make sure that everything was ok.
Well, the guys at the Ford service dealer have something to learn, teamwork !!!
Happy New Year !!!!!!!!
:party2: