hey i just installed a new aftermarket LS3 throttle body that has been CNC ported. it also has a 30% thinner throttle shaft for more airflow. it has been installed for 2-3 weeks and i have gotten 2-3 p0121 engine codes. i've attached some screenshots since my datalog is too big. whoops lol one is a WOT run and then the other is when the car was idling while hot
my question is should the throttle % be fluctuating at WOT (never saw that issue with my GM tb)? the guy i bought it from thinks this is normal, but my LS3 is NA so there shouldn't be anything causing the blade to flutter airflow wise. i also think that the % it is open at the end where i am idling (was checking fan speeds to be sure they came on) is way too low @ 0.4%.
any ideas? is the throttle body bad? i will be installing my old tb for now.
edit: screenshots of a WOT run and hot idle with the GM TB have been added. logs are too large so i can't attach, but can email. i did also get two other engine codes and i think they were related to the TPS outputs but those came up only once
Last edited by xc_SS/RS; 03-29-2020 at 12:10 PM.
Reason: adding screenshots