Troyphy truck

[luvmyxj]

yes, fords have a profile ignition pickup sensor in the dizzy, fords version of a crank sensor
if i stick a 12+jumper into the + side of the injector as long as the eec completes the circuit with the ground that should run the engine, right?

[mr.mindless]

Double check wiring schematic but that’s certainly what I’d expect…

[luvmyxj]

giving this thing one more go b4 i either pull the drivetrain and swap in chevy 5.3 or salvage whats of value and scrap the rest. What ive just noticed is according to this  https://www.startmycar.com/us/ford/f-250/info/fusebox/1995 under dash fuse no. 13 has electronic engine control tied to it, would that have anything to do with the ecu functioning properly?

[mr.mindless]

By the name, very much so

Could be source of power or switched power. I’ll have to reread to see what the problem is

[luvmyxj]

By the name, very much so

Could be source of power or switched power. I’ll have to reread to see what the problem is

No power to the injectors. Engine will run on starting fluid

[M4wdFab]

ford does lots of weird things, im still surprised you have spark which means the PCM is happy with crank and distributor signals / wants to start.


really only leaves mechanically stuck injectors from aged fuel, or no constant +12 power to the injectors (PCM switches ground).  the +12v should be tracable and just go to a main relay or fused power- i would start with that.  if you dont have constant power to all those pink wires on the injectors when your ignition is on it just wont start.   

[luvmyxj]

injectors are brand new.
im not getting power to maxi fuse 22 which is ignition, so ive hot wired that with 12+ and all the relays go clicky ckicky
ive also jumpered the nss switch
grounds are all reading good
with my multimeter set at 200ohms im getting 14.8 at the injector plug
i have no voltage on the red wire of the injector plug
engine will still start and run on starting fluid

[luvmyxj]

underhood diagram

[dubt]

So looking at the diagram do you have power going into the pcm relay,And then back out then it clicks on. I just had this kinda issue on a 4 wheeler and it was a bad relay it would click but not stay closed.

[luvmyxj]

when i plug my jumper wire in, which is black top right ,pcm relay will click then 3 seconds later click again, does the same with 3 other spare relays

[mr.mindless]

have you bypassed the PCM relay to see if that provides expected hot side power to the injectors? I'd definitely do that with a fused lead. if it's a relay issue/ignition issue as it seems to be, giving fused 30A power to the output of "EEC OR PCM RELAY" should work around that.

I can't imagine what would make it click back off after hotwiring fuse 55 unless that black wire goes somewhere else other than straight to ground.

Are you missing some ground wires anywhere for the relay box?
Everything highlighted on that diagram looks pretty dead simple. running on ether means the ECM is getting juice.


Harder to tell if white and tan are switching ground as it cranks trying to fire the injectors, easier to just give the red side juice and see if fuel pump lights up and then injectors pulse

[luvmyxj]

So are you saying to jumper 30 to 87 of the relay ,or give 87 12v. Do I even have the relay terminology correct?

[M4wdFab]

unplug the pcm

turn you "ignition" on or whatever you would do before a crank attempt.


do you have +12 at ECM pins 1, 57, 37, 22 between ground?  if not, fix that should fire if injectors are not mechanically stuck. 

[luvmyxj]

All pins suggested have 12+
Checked continuity from injector plug back to 48pin engine plug ,was good. If I wanted to check continuity from fuse box to injector 12+, where would I start?

[luvmyxj]

Pcm pinout for reference