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drill out the brass inserts from the TPS, and mount it back onto the throttle body, with washers on the screws to keep it in place, will slide off without washers. then turn the tps until .7V is read on a multimeter on the signal wire back to the pcm at idle. however, if your TPS sends approx .65V at idle back to the pcm, dont bother with the mod, it's not a significant enough increase for the butt dyno. my tps is still unmodified, and reads like .67V at idle.
the mod is supposed to correct the output voltage if it's lower than .7v, no higher than that.
I have heard guys that don't even have to mod theirs like fox672, but mine was sitting at 1.1v and I still have to adjust it more to get .7 or under, anybody else have this extreme or is it just me?
supposedly it also corrects back once you mod it so from what i've read in the past after a few weeks its not worth it and goes right back to how it was. :/