i have a 2004 f-250 with 6.0 turbo. would bad batteries cause the ficm to mess up randomly. went it is hot, temp and truck i come to stop light and truck starts to feel like it misses. But this is random not all the time. my thought is the ficm is starting to go bad or dropping a injector which still goes back to ficm. what is your thoughts please. want it fixed before it gets cold please help.
brandon

 

Bad batteries if not addressed quickly can potentially destroy a FICM...

-Test the alternator
-If bad, replace

-Load test the batteries
-If bad replace

-You may end up replacing both, be prepared...

-Test FICM control module for 45-48 Volts using this procedure: https://www.ford-trucks.com/forums/8...procedure.html

 

both the batteries and alternator have been replaced. alternator low speed charge was bad and ruined my batteries.

 

you may have cooked the ficm,it needs a steady 48.3 volts or it can cook the injectors. good luck.voltage is very important on these 6.0's. they are like a pretty women.lots of p-m.and not much return.