Engine running lean – Kia Forte 2.0 2010

Car Forum Repair & Maintenance Engine running lean – Kia Forte 2.0 2010

  • sida
    Community Member
    November 14, 2021 at 9:17 pm

    I recently bought a Kia Forte 2010 2.0. 30 minutes after driving off from the seller, the check engine light came on.
    Code P2191: Lean at higher load bank 1.
    I replaced the upper O2 sensor, the map sensor and the PCV valve.
    I took a look at the sparkplugs, and they were all a little white.
    I have also tried looking for vacuum leaks, by holding a hand to the throttle body, which killed the engine – therefore I suspect no vacuum leaks?
    The engine does not misfire, it starts right up and runs smoothly – the only signs of it running lean is the lack of power and the CEL.

    If I get directly on to the highway within 10 miles, the CEL will not come on.
    If I drive around town for 10-15 miles it comes on, when the engine gets warm.
    If it is already warm and i drive around town the CEL will not come on.

    Maybe you can help determine what the cause could be?

    Best regards the frustrated amateur mechanic

    Brand: Kia
    Model: Forte
    Year: 2010
    Engine: 2.0

    November 16, 2021 at 12:23 am

    Lean mixtures on high loads are often due to fuel delivery issues like a bad fuel pump, line, or a clogged filter. Did you check the fuel pressure? If it was a long time ago you replaced the fuel filter, I would begin with that!

    old garage mechanic
    Community Member
    December 1, 2021 at 11:07 pm

    P2191,   You said you replaced the oxygen sensor,  check the fuel rail pressure.