ECM questions, sensors, TPS and MAP (Page 5/5) PePe-LePu_For_2 APR 07, 05:37 PM quote Originally posted by fierobear: I haven't swapped them back yet. The Forumla has the GT ECM and vice versa. Formula is running well. My next step is to do the above mentioned shim, but I'd like to get some idea as to a good starting/idle TPS voltage so that I can shim the tang to that point. Ah, I didn’t read your post correctly the first time. I now understand.