The fuel rail pressure is wrong because the gasoline pressure is high or low. Check the oil pressure value and estimate that there is a problem with the gasoline pump or the pressure relief valve.

Due to poor fuel, the fuel injector does not work well, causing serious carbon deposits in the cylinder; accelerated wear of the cylinder barrel and piston ring, resulting in unstable idle speed, increased fuel consumption, weak acceleration, difficulty in starting, and excessive emissions. In severe cases, the injection nozzle will be completely blocked,and damage the engine. Therefore, it is necessary to clean the fuel injection nozzle regularly. Long-term non-cleaning or frequent cleaning of the nozzle will cause bad effects.

The performance of fuel injectors plays a fundamental role in the power of each engine. Due to poor fuel, the fuel injector does not work well, causing serious carbon deposits in the cylinder.

Accelerated wear of the cylinder and piston ring causes unstable idle speed, increased fuel consumption, weak acceleration, difficulty in starting, and excessive emissions. In severe cases, the fuel injection nozzle will be completely blocked and the engine will be damaged. Therefore, it is necessary to clean the fuel injection nozzle regularly. Long-term non-cleaning or frequent cleaning of the nozzle will cause bad effects.

As for the cleaning time, it should be determined according to the condition of the car and the quality of the fuel added at ordinary times, generally speaking. If the vehicle is in good condition and the fuel quality is good, it can be extended to about 40,000 to 60,000 km.