Posts Tagged: long term fuel trim

Long term fuel trim

July 21, 2018

What is long term fuel trim? This article deals with long term fuel trim. If you’d like to learn more about fuel trim in general, read this post Powertrain and engine control computers (PCM/ECM) employ a long term fuel trim delivery strategy that learns to self-adjust as driving conditions change and the engine wears. Once the engine is up to operating temperature, the PCM/ECM employ a short term fuel trim (STFT) strategy. But as the PCM/ECM begins to notice a pattern of adjustments, it stores those adjustments in a cell … Read More