NO FORD TECHS HAVE STEPPED UP YET.IT GOES INTO OPEN LOOP AFTER IT STARTS WARMING

I would check the real temperature of the engine with a lazer pyrometer, that way you will know the actual engine temp to see if the coolant temp sensor is telling you the truth. If the coolant temp and engine temp agree and are too low, say around 150-160 degrees, then replace your thermostat so your can get your engine into closed loop. Until your engine goes into closed loop, the fuel trim not be active and its reading will not make any sense. Fuel trim is an adjustment that is made by the PCM to keep the engine fuel control within a tight spec window, so the engine never runs too lean or too rich. Some call this stoichiometric fuel control. The PCM will add or subtract from the millisecond injector 'on time' which adds to or subtracts from, the amount of fuel delivered to the engine.