What Causes Car Shaking and Engine Warning Light to Illuminate?

[OGabrielle]

The reason for car shaking and engine warning light illuminating is incomplete combustion of the air-fuel mixture in the engine. When the mixture in the cylinders is too rich, symptoms such as engine knocking and shaking occur. When the mixture is too lean, the car may experience poor acceleration. Here are the specific explanations: 1. Substandard fuel: Using gasoline with a low octane rating can easily cause engine knocking. Although the ECU can detect engine knocking through the knock sensor and eliminate it by delaying ignition timing, if it exceeds the ECU's processing limit, knocking will still occur. In this case, the engine will shake violently, transmitting noticeable vibrations to the car body, and the engine fault indicator light will also illuminate. 2. Ignition system failure: Malfunctions in the spark plugs, high-voltage wires, or ignition coils can also cause the engine warning light to illuminate, along with symptoms like car shaking and insufficient power.