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I have installed a rebuilt 2.4 into a 2003 Optima
From the time I turned the key on the Check engine light has been on & the idle was up and down if any idle at all I got it to idle warm by moving the throttle cable back & forth On the test drive the trans shifted prefect Stopped & topped the tank off with gas take off down the street & the trans won't shift or if it does it is around 4-5000 RPM
I scanned it & got P0123 as the only code the ECM would release of 2stored
P0123 also was stored in the enhanced memory
I changed the TPS with no change & the only other thing being the wiring
Thank's ahead Bob
 

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1999 Kia Sephia, 2016 Kia Optima SXL, 2019 Kia Soul Plus
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I have installed a rebuilt 2.4 into a 2003 Optima
From the time I turned the key on the Check engine light has been on & the idle was up and down if any idle at all I got it to idle warm by moving the throttle cable back & forth On the test drive the trans shifted prefect Stopped & topped the tank off with gas take off down the street & the trans won't shift or if it does it is around 4-5000 RPM
I scanned it & got P0123 as the only code the ECM would release of 2stored
P0123 also was stored in the enhanced memory
I changed the TPS with no change & the only other thing being the wiring
Thank's ahead Bob
Where did you get the TPS from? You should check the wiring for short to ground, open in harness or ground, provided the TPS is a good part. You might also clean the throttle body as a preventative measure.
 
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