Long Therm Fuel Trim -21

Discussion in 'Hyundai' started by UberJager, Apr 24, 2020.

  1. UberJager

    UberJager Member

    My car has been constantly rising ltft for the last two months. 5 months ago while the value ltft -7, today rose to -21 s.The car's afr setting appears to be 15.5: 1. Ecu manages to keep it in balance. But this situation scares me. What could be the problem in your opinion?

    xcel likes this.
  2. BillLin

    BillLin PV solar, geothermal HVAC, hybrids and electrics

    Hi, I have no idea, but one google search result suggests:

    What causes a high long term fuel trim? ... Here the PCM/ECM is basing fuel delivery on feedback from the engine's mass airflow (MAF) or manifold absolute pressure (MAP) sensor. Any air leak that occurs AFTER these sensors is a leak that's allowing UNMETERED air into the engine.Jul 21, 2018

    Long term fuel trim — Ricks Free Auto Repair Advice Ricks Free ...
    xcel and UberJager like this.

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