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  1. jonheld

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

    You're describing the fuel pump logic from a 3FE. The 1FZ-FE uses slightly different logic. The ECU runs the show and has no cold start injector.
  2. jonheld

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

    B+ at the diagnostic connector comes from the 15 amp EFI MAIN fuse through the EFI MAIN relay. The ECU energizes the EFI MAIN relay.
  3. jonheld

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

    Understand that you are reading across coils in a stepper motor. Coils will open or short. It is extremely unlikely that they will slightly increase in resistance. I'd be willing to bet that the ISC is just fine. You can also test it with a 9 volt battery pretty easily. This is explained in the...
  4. jonheld

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

    How about starting with the basics before using the parts cannon. During a no-start are you getting spark? During a no-start are you getting fuel?
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