big thanks for this thread!!
truck started running rough and missing really bad, spitting and sputtering when cold, and no power. after warmed up, it ran better but still had a noticeable miss, and hesitation during acceleration and cruising.
I have the 7 pin ficm, so i followed the directions on this thread and the 4pin directions.
found 52v with key on, 52v while cranking, and 25v when running
so time to dig into the ficm.
i removed the 2 screws for the overflow bottle, but did not remove it completely, i found enough room without having too.
split the case and inspected, at first glance couldnt see anything wrong. got the heat gun out to heat up the amber gel around the screws. 5 seconds on low with the heat gun was enough to remove it. sure enough as i peeled some of the gel off one of the resistors came with it!!
so i continued on. first i re soldered the resistor that fell off on, then added more solder to the other the 3, the i also added more solder to the backside of the board as mentioned in the repair procedure.
lightly rubbed the 7 holes the pins go through, and slapped the case back together.
re tested and 52v across the board!!
bolted everything back together and up the street for a test run!! running like brand new!!
took me maybe 2 hrs for the hole procedure! thank you thank you thank you!!
SO in fixing this, my only questions are:
what causes the ficm to go bad, and how long does this repair usually last?