Hello 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?
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 ...
