N14 shuts down randomly

well, while my mechanic came by to help put my oil pump backbin i asked him about it. he said the old owner pulled the innards out to bypass, and probably added something so when the truck turns off by key, it also kills the ecm. sooo, what we did was put the innards back in from a new one i bought, and put the 12 volt thing on and added a wire.

i also noticed the wires to engine position sensor were terrible and bare. im sure they were touching or have been rubbing against each other. i seperated, cleaned, and put some liquid tape to cover them. going to get my steering pump in the morning and crank this thing up and see what happens.

 

when i had in the shop the first time this happened, he pulled those fuses and cleaned them. lasted a whole month before it did it again


so ur saying the ecm is powered from the cable on the starter? ill check that out in the morning. i checked the cables to the starter and they were tightened up good

 

and its down again..cut off on a load this morning. i unplugged the 2 fuses and replugged them from the starter. and unplugged/replugged the ambient air sensor (according to an online diagram).. and it turned on and got me home. funny thing is, everytime this happens, the volts read really low when im cranking it back up, then it goes up once it stays running.

not sure if any of the above has to with anything tho. i brought it back to the first shop i tried..see what he says

im running out of options..

 

i sure hope so...in the last month ive replaced..

oil and filter
fuel filter
one battery (others tested good)
alternator
intake air sensor
engine position sensor
power steering pump (unrelated)

leaving the shop now, his diagnostic computet is out for repair...going to another guy i know to scan it.

im wondering if it could be ambient air sensor? i read in another thread those things could cause shut off and loss of power ( mine feels like its been robbed of power the last 4 months or so)

 

both