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1. stepping on the accelerator, it was found that the acceleration was not obvious, and there was a lack of power. The engine had hysterical voices. The most likely time is when the engine is hot or cold, or when it is short of oil. Of course, a small displacement engine may be accelerating too fast. Here I only talk about general displacement, such as 1. More than 5. The causes of such defects can be divided into: air filter, spark plug, ignition line, gasoline, gasoline filter, vaporizer, oil pump and so on. Check whether the air filter is dirty. The spark plug is old. It needs to be replaced. The ignition coil is broken and the gasoline is not clean, for example, there is water in the oil way. And check the oil pump and the carburetor (if there is a car).