I have a kia sportage 2001 that loses power when it gets hot. We have checked exhust back pressure - checked ok. engine vaccum, ok. check MAF and TPS, ok. Checked timing, ok. Cjecked vaccum, ok. Check and cleaned ground from battery and ecm. Intermittenly 02 sesnsors go lean, checked wiring and sensors, ok. Changed ecm, no change. We have changed the coils & spark plugs, the fuel pump and fuel filter. All of the fuses have been checked.

SOURCE: 2000 kia sportage trouble code po171 once in

I have 2005 Kia Sportage with a check engine light. No other symptoms. I was told by Kia and Local mechanic that it is the fuel injectors. Error Code states that Fuel injectors are running lean. Put Master airflow- no change. Ran engine test with propane to run rich and trim never changed from 15. Car runs great. Kia dealer said that this is because we use Ethel in gas that it effects the alumium fuel rail delivery to the injectors and that it is necessary to change all of them .Kia Dealer wants $1,000.00 deposit to place order 6 fuel injectors from Kia. (Has anyone heard of that?)Also put fuel injector cleaner in tank.Does anyone have any suggestions before I spend over $1,000.00 to replace all 6 injectors or possible idea of what could be wrong?