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  1. paulzak

    Why would new 3FE fuel pump improve gas milage

    Wondering if anyone knows why a new fuel pump might improve gas milage... by a lot? My '92 FJ80 3FE has been getting 8 mpg for a long time. I replaced the aging fuel pump and sock and now I get 12mpg. I'm not complaining but I can't see how this could logically happen. The truck has 260k miles...
  2. paulzak

    '92 3FE FJ80 Cruise Control unusual fix

    After experiencing regular cruise control failure to engage I seem to have stumbled onto an easy fix. CC would turn on, dash light came on, but it immediately failed when trying to engage. So I removed the CC actuator and opened it up to have a look. It was beautiful inside. No evidence of water...
  3. paulzak

    Drive flange hits spindle. '92 FJ80

    Odd problem. Did a quick search but didn't get any hits. I replaced the birfields some time ago with the replacement taller drive flanges. I've gotten considerable buggering of the spindle lead threads due to interference with the drive flange. I cleaned them up and have placed 3 paper gaskets...
  4. paulzak

    210 ohms O2 Heater '92 FJ80 throwing code21. Is this a recogized failure mode?

    Started getting code 21. CEL comes on when cold, but goes out at freeway speed. I measured the primary O2 sensor heater resistance (@ the separated connector) and get 210 ohms. FSM says it should be in the 4 to 6 ohm range. Is this how these suckers fail? I'd have expected an open before an...
  5. paulzak

    Heat from rear heater even with working ctl valve off.

    Does anyone know why I may be getting significant heat from the rear heater (rear fan switch on) even with the dash temp control cold and no heat coming from the front? I have checked the valve and the control cable. Seems odd since the control should shut flow to the front and rear...
  6. paulzak

    Momentary loss of oil pressure on short stop

    Has anyone experienced a momentary loss of oil pressure on a really short stop ('92 FJ80 3FE)? I did today. Never happened before .1/3 qt low on oil. Are there windage baffles in the pan? I'm guessing the pickup is in the rear. ( I can easily check the FSM for that.) Only reason I know is...
  7. paulzak

    Fix 4 Exhaust Pipe Banging on Rear X-Member

    Forgive me if this is obvious or has been suggested before but I haven't run across it. For whatever reason, the spacing between the exhaust pipe and my '92 FJ80 rear cross member was tight enough to bang when driven on my 3/4 mi gravel driveway. After confirming that the mounting cushions...
  8. paulzak

    Doing fuel strainer at 230k. Should I just replied pump at same time?

    Given that getting to the fuel sock to replace it is a little bit of a nusance, do the gurus have any thoughts on replacing the pump preventatively? A Denso is about a hundred bucks on Amazon with the sick so it's not out of the question money wise. I don't have any reason to replace the pump...
  9. paulzak

    Chasing vs Tapping Block Threads

    Hi all. I'm in the middle of re-installing my cylinder head after a blown head gasket and a head refresh and have a question. After clearing the threads in two bolt holes, I've decided that the tap is too agressive and will revert to less violent ways to clear the rest of the threads . Have any...
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