P0171 KIA -

Question

i have a 1998 Kia Sportage with the code P0171 the car idles fine but when i give it gas it wants to stall out i have replace the Mass air flow sensor, spark plugs, fuel pump, and filter, checked the fuel system prssure and nothing fixes the problem it has no power what else is there?

Answer 1

Check for a possible vacuum leak. Unmetered air can also cause this code. With the vehicle running, spray some carb cleaner along the intake and any vacuum lines and see if the idle speed increases. If it does, then you have a vacuum leak. Also, check and make sure the catalytic converter is not plugged up. The exhaust back pressure coming back into the engine can also cause the lean mixture and a lack of power.