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  1. jonheld

    FJ80.... Does a short circuit in an injector stops the whole engine?

    OP stated that the CEL was illuminated, which rules out the EFI relay.
  2. jonheld

    FJ80.... Does a short circuit in an injector stops the whole engine?

    Not on a 3FE. The +12 for the injectors is off the AM2 fusible link through the ignition switch.
  3. jonheld

    FJ80.... Does a short circuit in an injector stops the whole engine?

    Please remember that the ECU in your truck was designed in 1986. This is first generation fuel injection. Removing the connector on the AFM (not a MAF on this engine) won't throw a code. Not sure what you mean by a "Lamba" sensor. Buongiorno.
  4. jonheld

    FJ80.... Does a short circuit in an injector stops the whole engine?

    The ECU in the 3FE fires injectors in 2 banks of 3. If there was an issue with a single injector, it would likely take out the other 2 in that bank. However, I find that VERY UNLIKELY given your description of the problem. Work through the EFI diagnostic document and remember If the CHECK ENGINE...
  5. jonheld

    FJ80.... Does a short circuit in an injector stops the whole engine?

    I would suggest starting from the beginning. https://forum.ih8mud.com/resources/3fe-efi-diagnostics.89/
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