Hey all, I did my digging on here as best I could between 3FE no start guides (this one, specifically) and a number of threads about various issues with no starts and stalls, but having tested a few things out I was hoping for some input as I worry it's a wiring or short problem at this point. Note: 1991 FJ80 with 3fe, american model, gas, automatic, and check engine light has been mostly continuously when driving for last several months apart from when reaching speeds above 60-70mph, strangely. I ignored this because I was experiencing no issues, hearing nothing unusual, and it would go off seemingly at random.. also I happy to choose ignorance.
Maybe some context will help the issue jump out to someone:
Two days ago cranked engine up no problem, even after sitting in the cold a week. Move it to let someone park behind me, turn engine off but realize I should back up slightly. Turn engine back on, shift to reverse, engine stalls out and dies almost instantly. This has only happened once before, while driving months ago, but I assumed it was a fluke or had been fixed by the some rewiring my mechanic did (he took it upon himself to do so and did not provide details, as I've been having electric trouble with this rig for years).
I attempt to turn back on after stall and it cranks endlessly. After so many power loss/battery issues, I was sure jumping it would work but it did not: cranking endlessly still.
Now, upon looking into this I recognize the importance of these facts:
when key is in ON position, I get no CEL light or charge lamp light, BUT I do have brake lights and dome lights, as well as A/T and seatbelt lights which indicates that maybe there's some issue with FL AM2 (I don't really know what this means apart from its place in the no start guide regarding the fusible link). Fusible link and EFI relay have both been replaced within the last six months, but I check my fusible link anyways, clean all contacts, and even swap out to a new spare just to see if it was faulty.. Nope! EFI relay contacts looked great too. So now I'm curious if it's my circuit operating relay? Or the ground? Or a short / break in a wire, maybe the AM2 considering I have brake lights and dome lights but no charge lamp? Maybe most likely is an issue with the Air Flow Meter and its delicate little hat but I haven't even learned where it is exactly, all I know if you can't mess with its two screws.
Here is where my understanding ends, and it was starting to rain to I gave up tinkering.
Sidenote: the top connector (mustard colored bit) of this white wire with red bands was unclipped from this little glass tube when I started poking around, what is this? The ground? The section I clipped back onto the tube was connected to the positive battery terminal with the fusible link.
Also, what in the hell is this red wire that's just sitting disconnected? Leading to the port in the back left of the engine bay. Please excuse my ignorance I am learning, but very slowly.
Maybe some context will help the issue jump out to someone:
Two days ago cranked engine up no problem, even after sitting in the cold a week. Move it to let someone park behind me, turn engine off but realize I should back up slightly. Turn engine back on, shift to reverse, engine stalls out and dies almost instantly. This has only happened once before, while driving months ago, but I assumed it was a fluke or had been fixed by the some rewiring my mechanic did (he took it upon himself to do so and did not provide details, as I've been having electric trouble with this rig for years).
I attempt to turn back on after stall and it cranks endlessly. After so many power loss/battery issues, I was sure jumping it would work but it did not: cranking endlessly still.
Now, upon looking into this I recognize the importance of these facts:
when key is in ON position, I get no CEL light or charge lamp light, BUT I do have brake lights and dome lights, as well as A/T and seatbelt lights which indicates that maybe there's some issue with FL AM2 (I don't really know what this means apart from its place in the no start guide regarding the fusible link). Fusible link and EFI relay have both been replaced within the last six months, but I check my fusible link anyways, clean all contacts, and even swap out to a new spare just to see if it was faulty.. Nope! EFI relay contacts looked great too. So now I'm curious if it's my circuit operating relay? Or the ground? Or a short / break in a wire, maybe the AM2 considering I have brake lights and dome lights but no charge lamp? Maybe most likely is an issue with the Air Flow Meter and its delicate little hat but I haven't even learned where it is exactly, all I know if you can't mess with its two screws.
Here is where my understanding ends, and it was starting to rain to I gave up tinkering.
Sidenote: the top connector (mustard colored bit) of this white wire with red bands was unclipped from this little glass tube when I started poking around, what is this? The ground? The section I clipped back onto the tube was connected to the positive battery terminal with the fusible link.
Also, what in the hell is this red wire that's just sitting disconnected? Leading to the port in the back left of the engine bay. Please excuse my ignorance I am learning, but very slowly.