Is a Short-Term Fuel Trim of 99.2% Normal?

[StCassidy]

Whether a short-term fuel trim of 99.2% is normal mainly depends on whether the sum of long-term and short-term trim values exceeds 5%. If it exceeds 5%, it is considered abnormal. Here are specific details about engine short-term fuel trim: 1. Influencing Factors: Factors affecting the fuel trim coefficient include engine misfire, poor exhaust, low fuel pump pressure, or clogged fuel injectors. Inspection can start from these aspects. 2. Troubleshooting: You can check whether the injectors are clogged, whether the spark plugs are eroded, the quality of gasoline, whether the air flow meter is faulty, and whether the fuel filter has not been replaced for a long time.