Posts Tagged: high fuel pressure issues

What Does Negative Fuel Trim Mean? Expert Diagnosis Guide

Negative Fuel Trim: What It Means, What Causes It, and How to Fix It Fast Quick Summary A negative fuel trim <-10% means the engine computer is subtracting fuel because the engine is running too rich. Running rich can be caused by too much fuel or insufficient air entering the combustion process. The most common causes of negative fuel trim include: • Leaking fuel injectors • High fuel pressure • Faulty sensors • Restricted airflow, • Evaporative system issues. Fixing negative fuel trim requires identifying why the engine is rich … Read More