Haval h2 suddenly found that the car lacked power and felt heavy behind it. What happened?

1. Due to the blockage of the vent hole of the fuel tank cover, the fuel tank switch, fuel filter and the oil pipe between the fuel tank and carburetor are partially blocked, which can not meet the required oil supply, resulting in the mixture being too lean and the engine unable to work. Due to the long-term use of air filter, the air is insufficient, and the combustible mixture will be too rich, which will reduce the engine power. If gasoline with low octane number is used, it will be stored for too long, and the octane number will be too low due to volatilization deterioration, which will easily lead to knocking and reduce engine power. Carbon deposits in spark plugs and other parts will increase fuel consumption. There is water and air in the oil circuit, which will affect the smooth flow of fuel. Excessive carbon deposition in muffler will increase exhaust resistance.

2. Inappropriate ignition timing and premature ignition lead to premature combustion and detonation of combustible mixture. Due to the ignition system failure, the spark plug is broken or the spark plug is not firm.

3. Cylinder compression pressure: the piston, piston ring and cylinder are seriously worn, which leads to the increase of the fit clearance between the piston, piston ring and cylinder, and the deterioration of sealing performance, which leads to air leakage in the cylinder head and reduces the cylinder compression pressure. Due to poor sealing, the crankcase leaks air, resulting in reduced suction.

solution

1. Check whether the air filter is blocked and remove it if necessary.

2. Check the throttle opening. When the accelerator pedal is fully depressed, the throttle should be fully opened. Otherwise, adjust the cable or study the pedal position sensor and throttle position sensor.

3. Check whether the high-voltage line, spark plug and high-voltage spark are too weak.

4. Measure whether the fuel pressure is too low, and check the electric fuel pump, oil pressure regulator and gasoline filter if necessary.