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  1. Nbndallastx

    ‘93 FZ80 Engine shuts down randomly only after it’s warmed up…

    It’s been a few months and just wanted to confirm that the new OEM sending unit had solved all my random shut off issues to date! the culprit was the electrical connections in the sending unit…first the ground but also there was corrosion on the leads inside the epoxy - I tried to reseal but...
  2. Nbndallastx

    ‘93 FZ80 Engine shuts down randomly only after it’s warmed up…

    really weird...i disconnected the fuseable links to inspect them...they looked great (they're brand new a month old)...put everything back together and it fired right up? maybe a bad connection and when i messed around with the wires it sorted stuff out...anyways, we'll see how the rest of...
  3. Nbndallastx

    ‘93 FZ80 Engine shuts down randomly only after it’s warmed up…

    well just tested +B and now not getting 12V with the key on🤦🏻‍♂️ CEL is lighting up, so not an ERI Relay issue🤔 Thoughts? going through the fuses currently...
  4. Nbndallastx

    ‘93 FZ80 Engine shuts down randomly only after it’s warmed up…

    1.5week update… So for the last 11days I’ve been driving the fzj80 to San Antonio which is almost 200miles round trip each day from Austin…so since the repair we’ve done over 2000miles no issues until yesterday! Yesterday morning it was 60ish degrees at 6am and the pump wasn’t getting power...
  5. Nbndallastx

    ‘93 FZ80 Engine shuts down randomly only after it’s warmed up…

    Just wanted to update the group here, for ppl who aren’t on IG, day #5 no engine shut downs since the fix! 3 of the 5 days were +200 miles round trip commutes to San Antonio- no issues 🙌🏽
  6. Nbndallastx

    ‘93 FZ80 Engine shuts down randomly only after it’s warmed up…

    So true and thx! Glad to have my 80 back!!
  7. Nbndallastx

    ‘93 FZ80 Engine shuts down randomly only after it’s warmed up…

    Ok - 3rd day of test drives and running the 80 hard…no forced shutdowns, since the fix🙌🏽 This was the issue, after 5wks of troubleshooting…PO had rigged a janky metal screw for ground within the fuel sending unit! It had rusted so bad that it had intermittent ground and would cutout…also the...
  8. Nbndallastx

    ‘93 FZ80 Engine shuts down randomly only after it’s warmed up…

    Sorry for the crickets this week…I was out of town for work all week but huge developments on the solve - we worked on it this afternoon, no shutdowns this evening…still need to test drive over this wknd to confirm…trying not get too excited🤞! More to come…
  9. Nbndallastx

    ‘93 FZ80 Engine shuts down randomly only after it’s warmed up…

    I’m very green with electrical and learning too! So when hardwired (+B to FP)…is it safe to say those connectors and the pump work to an extent…then something happens (ie. maybe a short due too heat) that kills the pump…causing the rig to shutdown…then once I restart the car it takes a few...
  10. Nbndallastx

    ‘93 FZ80 Engine shuts down randomly only after it’s warmed up…

    Ok I think we’re narrowing in on what’s going on…maybe🤞🏽 So for context the shut downs are very sporadic and hard to troubleshoot… but the hotter it is the more frequent they occur today was high of 97 in ATX So we decided to get back to basics and try to confirm spark and fuel again - we had...
  11. Nbndallastx

    ‘93 FZ80 Engine shuts down randomly only after it’s warmed up…

    Thought I would upload the video of my rig 100ish feet from the summit…my engine shut down and I heard this bubbling coming from the tank. Then pooped the hood and pulled the line from the tank to the CC…drove back to texas with it vented thru my fender…didn’t happen again 🤷🏻‍♂️
  12. Nbndallastx

    ‘93 FZ80 Engine shuts down randomly only after it’s warmed up…

    Sorry I should’ve been more specific…I installed new battery clamps that you bolt to the battery. Yes CEL bulb is working - it lights up during ignition and goes off, even pulled pulled TPS plug while running and CEL popped immediately, plugged back in and it went away. Update new COR...
  13. Nbndallastx

    ‘93 FZ80 Engine shuts down randomly only after it’s warmed up…

    yes, but that negates the 2yrs i had the rig in ATX without these issues, before heading to CO...so i wouldn't think altitude is a factor. Reminder i drove +1000miles back to texas without issues plus a few days once i returned
  14. Nbndallastx

    ‘93 FZ80 Engine shuts down randomly only after it’s warmed up…

    you think it could be a bad connection or deep cycle battery messing with old fzj80 electrical system?
  15. Nbndallastx

    ‘93 FZ80 Engine shuts down randomly only after it’s warmed up…

    As I’m waiting for a new COR relay and IAC thought I would retrace my steps directly after our +2500 mile trip to CO/NM where I didn’t have this issue🤔 After I got back to ATX, I changed the below items within 5days of being back: - Charcoal canister and associated vacuum lines that led into...
  16. Nbndallastx

    ‘93 FZ80 Engine shuts down randomly only after it’s warmed up…

    So did the full range testing with the IAC, it did fine and moved a bit, plus I heard it clicking after shutdown. Ive tested multiple times and only one pair of terminals fail out of spec S1-S3 at 42ish ohms…I’m not sure if it matters given it’s a step motor but the FSM says it’s out of spec so...
  17. Nbndallastx

    ‘93 FZ80 Engine shuts down randomly only after it’s warmed up…

    I checked my EFI main relay it was round and my COR relay was a black box…and terminals were different🤷🏻‍♂️
  18. Nbndallastx

    ‘93 FZ80 Engine shuts down randomly only after it’s warmed up…

    Jumping +B and FP bypasses the circuit opening relay and the fuel pump relay. Did you verify 12V at +B when you did the jump? +B originates at the ECU and powers quite a few other things. It's all in the EWD which you can find in the resources section if you don't already have it. Confirming I...
  19. Nbndallastx

    ‘93 FZ80 Engine shuts down randomly only after it’s warmed up…

    No didn’t verify 12V at B+ but will do this today👍 As for verifying spark and fuel….yes we did after NS but I’ve noticed the longer we have the hood open and setting stuff up to check it always restarts first time (if that makes sense)…if I try to restart after NS right away it’ll crank and...
  20. Nbndallastx

    ‘93 FZ80 Engine shuts down randomly only after it’s warmed up…

    Sorry forgot to answer your question - it does at idle after a few minutes and randomly when driving
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