Been getting all sorts of idle issues, and have been getting the P0122 code at random, replaced the TPS and Iacv parked the iacv using sas mode and set the tps voltage at .69v then a few days ago have been getting sort of idle hang wherein the rpms would get stuck at 1600-2000rpms. yesteday did the same thing idle got stuck at 1900 at idle on a fully warmed engine and foot off the gas. tuned off the engine and called it a day.
This Morning upon driving out of the driveway, cel comes on, got the obd scanner(not evoscan) checked it out and P0122 again, reset it and checked the live data while on idle and was surprised to see the tps voltage at .41V when im dead sure i never touched the TPS and last time I set it was at .69V, what could cause this fluctuation is it normal? the live data would show the TPS voltage swing from .41 to .69V and it isnt like going up and down, it stay at .41, then .50 then .69 then back again. and when its at .41 the idle would be steady at 900 but at .69 the idle would be around 1200. what could be wrong? sensor going bad? TB leak? Electrical problem? btw, i dont have a wideband to check my AFRs. Any input would be great. Thanks!

 

When you replaced the IACV, did you remove/replace the o-ring under it? Also, confirm you set the TPS IAW: https://www.evolutionm.net/forums/showthread.php?t=668190&styleid=28

 

Yes o-ring was replaced with the new one that came with the iacv.

 

Does the car stutter or buck under light load/part throttle?

 

P0122 is a TPS code, so I would check all the wiring and make sure screws on the TPS are snug. Check all wiring around it, and check out this thread https://www.evolutionm.net/forums/ev...tting-tps.html. Reset the battery for 15 minutes, then plug it in and it should be good man. If it is not a smooth transition when you're moving the the throttle open and close, it's probably bad bro.

 

No. the car feels fine at part throttle. the problem i have encountered is that at .69V the idle would rise to around 1800 rpms at idle coming from a stop or when im about to park the vehicle, and it will stay there never coming down, turn off the engine and drive it the next day and it will idle fine. and when i hooked it up on a an odb scanner i was surprised to see the voltage drop down to .40 and i didnt touch the tps at all. so it got me thinking if my TPS is going bad or that the current that supplies the TPS has an issue that is why the voltage fluctuates.

 

Up this thread. Canyone else chime in?

 

Did you voltage test the tps man? It wouldn't hurt if u had a friend and swap tps's just to be sure if anything changed-especially if you replaced the IACV in its entirety.

 

Isbyour maf working correctly

 

Maf is working properly. Im waiting for my tps to arrive.