![]() This adjustment is called fuel trim and can be read using a scan tool. STFT and LTFT is within the spec at idle (+5 to -5%) but as soon as I put it in gear and start moving the LTFT drops to around -12 to -22%. That's been consistent and filling up doesn't seem to change it. What causes a high long term fuel trim? In this example we’ll examine the possible causes of a +13% long term fuel trim.Long term fuel trim at idle 2% and long term fuel trim 2 was -18%.
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