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  1. jonheld

    3FE surging issue (solved)

    I read through all 3 of these documents and they seem to be generic information not specific to the 3FE, but more so for the 1FZ-FE. Many statements of "on some models" and mentions of knock sensors which the 3FE does not have. The only terminal on the 3FE ECU that is labeled NSW originates at...
  2. jonheld

    3FE surging issue (solved)

    Where are you getting this information from? According to the Toyota FSM and EWD, there is no input to the ECU from the NSS. The only connection related to the NSS is the starter circuit which comes from the ignition switch.
  3. jonheld

    3FE surging issue (solved)

    Check the intake plenum for cracks. Any unmetered air will play havoc with the ECU.
  4. jonheld

    3FE surging issue (solved)

    I enjoy these discussions. By unplugging the O2 sensors, your ECU that was designed in 1986 is in an open loop mode. It is now ignoring sensor inputs and running a preset set of parameters. Now I'm not saying that the issue is not the O2 sensors, but it very well may not be. Until you have...
  5. jonheld

    3FE surging issue (solved)

    I consider it exactly that. You found a probable cause. At this point you have "solved" nothing.
  6. jonheld

    3FE surging issue (solved)

    Unplugging O2 sensors and running with a constant CEL is not what I would consider "solved".
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