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Could be a number of things. Ford's usually go through the computer to adjust the idle in order to compensate for a vacuum leak. Is the check engine light on and if so what trouble code(s) are you getting. I would start in order to repair the problem (With codes or not) by cleaning the throttle plae. The one that opens and closes in the throttle bpdy. Don't forget to disconnect the battery so the throttle position sensor works on learning a new idle. This is a commen problem for Ford products due to the gas with all the products in it that you buy no days. They leave a carbon build up and the throttle plate doesn't close all the way but the idle was set by the computer without all the carbon build up and that's all the computer knows. Hope this help and if you can get the trouble codes you can reply here or email me directly with them...
It depends if the system is RVC/regulated voltage control. If so, there are about six modes of operation. One is, "fuel economy mode". In that mode, the targeted generator out-put is 13 volts and battery state of charge is greater than 80%. There are two other conditions.
Is there a battery discharge problem? Does the instrument cluster give charging system message or warning lamp?
Any charging system trouble codes? My info on your charging system is limited.
CODE 43 IS ELECTRONIC SPARK CONTROL -.KNOCK SENSOR.LOOKS LIKE ALTERNATOR NOT PUTTING OUT ENOUGH VOLTS TO CHARGE BATTERY.YOU NEED 13.5 TO 14.5 VOLTS.CHECK ALTERNATOR FUSE AND ELECTRICAL WIRES.MAKE SURE BELTS NOT SLIPPING.IF ALL IS GOOD.REMOVE ALTERNATOR.LET AUTO ZONE CHECK IT.TO MAKE SURE.TURN OFF RADIO BEFORE MOVING BATTERY CABLES.SO YOU WONT LOSE RADIO CODE.YOUR CAR IS NOT GOING TO RUN RIGHT IF THE ECM DONT RECEIVE 12 VOLTS OR 13 VOLTS.