What should I do if the car engine is roaring loudly?

Reasons for loud engine noise: 1, stepping on the accelerator, it is found that the acceleration is not obvious, the power is insufficient, and the engine has hysterical sound. The most likely time is when the engine is hot, cold or short of oil. The causes of such problems can be divided into air filter, spark plug, ignition wire, gasoline, gasoline filter, gasifier, oil pump and other problems. 2. When driving, the acceleration is normal, and the ignition may be normal. However, if driving at a constant speed, it is found that the engine speed is too high, but the speed still seems to be unable to be lifted. Try to check the coolant. If the oil pressure is too high or too low, check the oil pressure gauge. It is also possible that there is a problem with the ignition time setting, which will also cause such symptoms. As for the others, it may be an internal problem of the engine, such as EGR valve blockage. The engine hisses, just like steam or air coming out of the engine. Generally, after hearing this sound, the engine will lose power quickly. Possible problem, engine overheating, check the cooling system. The exhaust system is blocked, and the vacuum tube leaks or breaks. 4. The engine will whir when accelerating, or it will appear when decelerating. In short, as the speed changes, the volume will also change. Possible cause: the power steering oil is insufficient and filled with oil. The generator bearing may be damaged. When there is a problem with the power steering pump and water pump, it will also produce similar noise.