What is the general range for short-term fuel trim?
1 Answers
Short-term fuel trim values generally range between -5.2% and -8.6%. Below are detailed explanations: 1. How short-term fuel trim works: Short-term fuel trim is a real-time adjustment of fuel injection quantity based on the oxygen sensor's feedback regarding the air-fuel mixture's richness or leanness in previous working cycles. Through continuous short-term fuel trim adjustments, the mixture's concentration is maintained as close as possible to the theoretical air-fuel ratio. 2. Factors affecting the fuel trim coefficient: Factors influencing the fuel trim coefficient include engine misfires, exhaust flow restrictions, low fuel pump pressure, or clogged fuel injectors. These areas should be inspected. If the combined value of long-term and short-term fuel trim exceeds 5%, it may indicate issues such as clogged injectors, eroded spark plugs, poor fuel quality, faulty mass air flow sensors, or overdue fuel filter replacement.