Re: FJ losing power while in 4WD with rear diff locked...
So i got stuck a couple nights ago with a friend on this muddy trail and something like this happened to me. I felt like i had my pedal to the metal but I wasn't even attempting to move. I switched off the A-trac and sure enough i was able to fling some mud. I'm not 100% sure how a-trac works but i do know it "senses" slippage on one tire or another and removes power from that tire and transfers to the other. Usually these types of systems only effect the abs but this seemed to have control over the power to engine possibly transmission as well (ecm im assuming).
If you dont have a-trac, try switching off the Traction control by holding the button for 5 secs until the light pops on your dash before going into 4-lo.
Last edited by FJDooM; 02-07-2017 at 09:24 PM.