What are the reasons for the engine yellow light coming on and lack of power when accelerating?
1 Answers
The reasons for the engine yellow light coming on and lack of power when accelerating include the following aspects: 1. Poor fuel quality: Using low-quality gasoline from non-standard gas stations can cause insufficient combustion of the air-fuel mixture during engine operation, triggering the engine fault light. This does not affect driving safety but may harm the engine to some extent. 2. Oxygen sensor failure: Modern cars are equipped with two oxygen sensors, one before and one after the three-way catalytic converter. The front oxygen sensor detects the air-fuel ratio under different engine conditions, and the ECU adjusts fuel injection and ignition timing based on this signal. The rear sensor mainly monitors the performance of the catalytic converter. Damage or loose connections in the oxygen sensor can cause the mixture to be too lean or too rich, leading to the fault light. 3. Airflow sensor failure: The airflow sensor measures the intake air volume and converts it into an electrical signal sent to the ECU, which determines the optimal fuel injection amount. If the sensor or its circuit fails, the ECU cannot receive correct intake data, disrupting fuel control and causing improper engine operation. 4. Spark plug carbon buildup: Carbon deposits on spark plugs can cause poor engine performance, including difficulty starting, unstable idle, poor acceleration, backfiring, excessive emissions, and increased fuel consumption. 5. Engine knocking: Symptoms include weak acceleration, excessive engine noise, and, in severe cases, knocking sounds. 6. Engine misfire: A misfiring engine leads to increased fuel consumption, black smoke, weak acceleration, severe vibration, louder engine noise, and frequent stalling. Misfires are often caused by issues in the ignition or fuel supply systems, such as spark plug carbon buildup or a faulty high-pressure fuel pump.
