Ok-here is some very interesting data on readings from my TPS. Some time ago, my original TPS went bad and I replaced it with a NAPA version. Today I took some readings on the throttle position percentage on my OBD2 scanner. This is on a 2003 Wrangler Rubicon 4.0L manual.
At idle position, the TPS signal is indicating 12.5% open. At WOT position, my TPS signal is reading 74.5%. Thats right, the closed idle is sending a 12.5% open, and at WOT it is sending a 3/4 open reading!!
I loosened the two mounting screws on the TPS and removed it from the throttle body. At full closed position, it will send a 0% open and at full WOT position it will send a 100% reading! Either this thing is calibrated all haywire or the ECU must have some BIG corrective adaptive memory capacity. I can't believe these readings aren't causing some power and performance loss. The TPS is an important input signal for the ECU and these numbers just don't seem right.
I am going to pick up an OEM Mopar TPS tomorrow and compare some readings. Does anyone have any data or readings from their TPS???? What say you?