^ how were you able to loosen the crank bolt with an electric impact gun?? mine does 300ft/lbs and I could never get mine off (along with a number of different 1mzs that I've changed the TB on), mostly because there's no way to keep the crank from moving so the majority of the torque bleeds away
well, my 1mz-fe crank pulley bolt came loose, after 10 to 15 seconds of impact, this is not the 12V cheap impact gun, this dewalt does 2700 impact per minutes. and from my naked eyes, my crank pulley was not spining/turning or shaking, or like you describe as torque bleeds away.
the first time i used it on axle nut, the nut won't come loose, because the brake rotor has some free play, and absorb all the impact and now i found when i loose the axle nut, i either leave the tire on ground, or have some one step on the brake pedel hard to hold the axle, or stick a big screw driver on caliper to jam the rotor/axle from spining.
like i said, the crank bolt didn't come off in the 1st second or two, it took about 10 to 15 seconds of hard impact pounding
by doing the math, 2700 strike per minutes, or 45 strikes per second,
15 seconds X 45 strike/second = 675 times to come loose.
and by the way, i didn't use any liquid wrench, wd40 or PB oil on the bolt.
i just took out the electric impact gun, put a 22mm socket on it, and pull the trigger.