What is the Appropriate Range for Long-Term Fuel Trim?
1 Answers
Generally, it is normal for the long-term fuel trim to be between -23% and +16%, but variations across different vehicle models are also common. About the automotive fuel delivery system: The proper operation of a car's engine relies on the fuel delivery system, which is crucial for the engine. During engine operation, the ECU controls the fuel injection duration of the injectors, thereby regulating the fuel injection volume. The fuel delivery system consists of components such as the fuel pump, fuel injectors, and associated piping. Some direct-injection engines also include a high-pressure fuel pump. Direct-injection engines require significantly higher injection pressure, hence the need for a dedicated high-pressure fuel pump. The high-pressure fuel pump is usually visible when the engine hood is opened, while the fuel pump is located inside the fuel tank. Port fuel injection engines typically have only one fuel pump. Issues with the fuel delivery system can severely impact the engine's normal operation. About vehicle data streams: Specialized diagnostic tools can read the vehicle's data stream, helping to identify problematic components. To access the data stream, an OBD interface is required, which is generally located beneath the steering wheel on the driver's side in most vehicles. Some vehicles may have less accessible OBD interfaces; if difficult to locate, consulting the owner's manual is advisable. During regular vehicle use, ensure the OBD interface does not come into contact with water.
