My 80 got towed home... (1 Viewer)

[Tower250]

So I've been driving my fzj80 for a few weeks now after rescuing it from a field sitting for a couple years. Has been running like a top for almost 1000 miles. Wednesday I was making the 30 mile drive to work and it felt like two different times it ran out of fuel for just a moment, like one cylinder missed. On my way home it shut off like I turned the key off. Cranks but will not fire at all. I changed the fuel pump last night, still no start. I crossed the B+ and Fp terminals and the fuel pump runs with the key on. Thats where I stopped last night. Any ideas where I should look next? Thanks in advance for any help, this forum has been a wealth of information for my project.

 

[ceylonfj40nut]

Check your fuel filter. Located under clamshell intake. Might be clogged. Also confirm fuel is getting to filter as well. Disconnect fuel filter banjo bolt and turn key to on without starting to see if fuel flows to the filter. Might get a tad messy. Perhaps have someone check. Fuel filter is not easy to get to.

 

[Landseer]

Emergency Troubleshooting Procedures - FAQ Item (Recommend Keeping Copy in Truck)

For updates or revisions, please PM me, nuclerlemon or semlin The below is a troubleshooting guide if your in the boonies to help isolate a non starting vehicle problem. This is a compilation from forum members, specifically RavenTai, KliersLC, Landtank and Beaowulf. This will not catch each...

forum.ih8mud.com

 

[retrofive]

Emergency Troubleshooting Procedures - FAQ Item (Recommend Keeping Copy in Truck)

For updates or revisions, please PM me, nuclerlemon or semlin The below is a troubleshooting guide if your in the boonies to help isolate a non starting vehicle problem. This is a compilation from forum members, specifically RavenTai, KliersLC, Landtank and Beaowulf. This will not catch each...

forum.ih8mud.com

Beat me to it.

Emergency Troubleshooting Procedures - FAQ Item (Recommend Keeping Copy in Truck)

For updates or revisions, please PM me, nuclerlemon or semlin The below is a troubleshooting guide if your in the boonies to help isolate a non starting vehicle problem. This is a compilation from forum members, specifically RavenTai, KliersLC, Landtank and Beaowulf. This will not catch each...

forum.ih8mud.com

 

[azngarage]

check the fusible link

 

[BILT4ME]

The fuel pump should NOT run with the key in the "RUN" position.

Is the CEL on with the key in the "RUN" position?

 

[Tower250]

The fuel pump should NOT run with the key in the "RUN" position.

Is the CEL on with the key in the "RUN" position?

Nope, now to find out why the ecu has no power.

 

[BILT4ME]

Nope, now to find out why the ecu has no power.

First place to look are the fusible links. Especially since it just "died". Also check all other fuses.

 

[Tower250]

Well, the fusible links test good, but I placed an order at wits end for spares anyway.
The 15 amp underhood efi tests with 12v present.
The 15amp in dash ecu-ig shows no v present.
Is there a way to check the 50amp underhood AMI relay? I'm assuming its upstream from ecu-ig?
I hate electrical...

 

[Tower250]

I've replaced the efi relay, and the 50 amp AMI, and still getting no power to the underdash ecu-ig terminal. I followed the above guide, plus tested the fusible links with a volt meter to each show current on supply side, checked all fuses multiple times, pulled the ecu, checked all connections, even opened the ecu to check for visible problems, smells, puffy resistors, and nothing. I'm down to swapping harnesses or sourcing another ecu?
Does anyone know where the ecu-ign fuse gets its power from? Thanks for any help. The above posted link was a wealth of information. Thank you.

 

[Landseer]

Looks like the ignition switch sits between the fusible link and the ECU-IG fuse

 

[Tower250]

Looks like the ignition switch sits between the fusible link and the ECU-IG fuse

This is the diagram I needed. Thank you so much sir!

 

[Kernal]

"opened the ecu to check for visible problems, smells, puffy resistors"

Which model year is your FZJ80 and what is the part number of your ECU?

 

[Tower250]

"opened the ecu to check for visible problems, smells, puffy resistors"

Which model year is your FZJ80 and what is the part number of your ECU?

1993.

 

[Tower250]

1993.

 

[Tower250]

 

[Tower250]

No idea the part number, sorry.

 

[Kernal]

Check post #13:

Most valuable parts on a 94?

So I picked up a 94 fzj 80 for back up of Beast Mode(my 93 locked LC). I got it mostly for a couple interior trim pieces and the rims for snow tires, and hopefully for a birf to replace my clicker (is there a way to check this without having a running engine?) Anyway, the exterior is pretty...

forum.ih8mud.com

 

[Tower250]

Check post #13:

Most valuable parts on a 94?

So I picked up a 94 fzj 80 for back up of Beast Mode(my 93 locked LC). I got it mostly for a couple interior trim pieces and the rims for snow tires, and hopefully for a birf to replace my clicker (is there a way to check this without having a running engine?) Anyway, the exterior is pretty...

forum.ih8mud.com

Thank you. This is why this sight is so awesome. So much info, if you know where to look. Thanks!!

 

[slow95z]

Some 93s had a bad ECU. They revised it later on. I have ecus if you need one.