The reasons for engine noise are: 1. The engine makes a whistling sound, which sounds like steam or air coming out of the engine. Typically, after hearing this noise, the engine will quickly lose power. Possible reasons: The engine is overheating, check the cooling system. The exhaust system may be clogged or the vacuum tube may be leaking or broken. 2. When accelerating, the engine will make a whirring sound, or it will also appear when deceleration. Possible reasons: lack of power steering oil, possible damage to the generator bearings, problems with the power steering pump and water pump, which will produce similar noises. 3. When the engine is idling, it makes a clicking sound, as if something is hitting metal. You may not hear it when you accelerate or drive. Possible reasons: This may be caused by the cylinder valve, which may bebe changed by adjusting the tap. Lack of engine oil can also cause similar problems and engine oil pressure is relatively low. Check the engine oil pressure. 4. The motor makes the sound of a pencil hitting the table, and the sound increases as the motor speed increases. Possible reasons: There is dirt inside the engine. It is recommended to replace the engine oil, engine filter and clean the engine. Others may be a valve problem. 5. There may be no problem while driving, but there may be a clicking sound when accelerating. Possible reasons: It is recommended to check the ignition device. The engine may overheat, the engine may have carbon deposits, and the oil quality may be poor. If you have a problem with your car, ask the auto guru. Professional technicians from 4S stores can solve the problem within 10minutes.
The oxygen sensor is damaged, replace the oxygen sensor.
The engine oxygen sensor is damaged. If the on-board computer fails to obtain the value, the amount of fuel injection into the engine will be abnormal, resulting in high and slow engine speed. after replacing the generator at 09 Lefeng, 80 miles at 3000 rpm. The oxygen sensor can be replaced.
The way to maintain the oxygen sensor is to not use low quality gasoline. Poor quality gasoline contains a lot of heavy metals, which can easily cause poisoning and oxygen sensor failure after use.