What Causes Poor Acceleration with Shaking in a Car?

[McEmmanuel]

Poor combustion of the air-fuel mixture in the engine can lead to knocking and shaking when the mixture in the cylinder is too rich. Conversely, if the mixture is too lean, the vehicle may experience poor acceleration. If the issue is not related to the air-fuel mixture, it could be due to faults in the spark plugs, high-voltage wires, or ignition coils. Poor performance of the ignition system or inadequate spark plug firing can also cause the engine warning light to illuminate and result in shaking and insufficient power. Below is the classification method for automotive engine oil grades: 1. AB Series: Oil for gasoline and light-duty diesel engines. 2. C Series: Oil suitable for catalyst-equipped engines. 3. E Series: Oil for heavy-duty diesel engines.