Optima idles high after Throttle Position sensor replacement.
I replaced the throttle position sensor on my 2005 KIA Optima about a month ago after reading a trouble code. Since I replaced it the engine now idles at 1100 RPM at first start and, after I drive around and then put the vehicle back in park, the engine idles anywhere from 1500 to 2000 RPM. I read online that this has happened to others that have replaced the TPS and it was suggested that they adjust the throttle by loosening the screws and turning the sensor in its mounting point. The screw holes are not elongated to allow such an action. I removed the sensor and checked to make sure that the flanges rested in the correct position and then screwed the sensor back in place. I still have the same end result. I did replace the old sensor back on to the motor to see if there was any change and found none so I swapped the new sensor back in to place. I have changed nothing else on the motor besides the TPS.
i don't know if that fits to KIA as well, but a lot of parts have to be recognized by the ECU, because they are connected via CAN-BUS. If your old "known" part gets broken, the ECU swappes into a failsafe mode, that allows you to reach the next KIA service with any part that fits. There, a new TPS is installed and the ECU is hooked up to a computer with KIA Software. This way the ECU learns to know this new TPS, and everything will work normal again.
For all those having this problem of high idle.......... all you have to do is swap the IAC and TPS connectors (they will fit into each others socket) . Thats right.......on my 2.5 v6 some dumbazz who did a plug and wire change swapped the conectors after finishing the job and also broke the no. 3 injector wire when the intake was removed. I purchased this car used (700.00) and determined all these things after troubleshooting numerous engine code issues. These were just the tip of the iceburg. I couldnt believe the half azz work some mechanics are capable of and worse of all it was to a woman..........