What Causes the BYD DM-i Engine to Shake?

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DM-i engine shaking can be caused by severe engine carbon buildup, ignition system failure, or unstable oil pressure, as detailed below. Severe Engine Carbon Buildup: The most common cause of car shaking is a dirty throttle body or excessive carbon deposits in the fuel injectors. When there is too much carbon buildup inside the engine, the gasoline sprayed by the cold-start injector is largely absorbed by the carbon deposits, resulting in an overly lean air-fuel mixture during cold starts and making it difficult to start. Ignition System Failure: Check the condition of the spark plugs, high-voltage wires, and ignition coils. Poor performance of the ignition system or spark plugs can also lead to such issues. Unstable Oil Pressure: If you have already cleaned the engine carbon deposits, cleaned the throttle body, and replaced the spark plugs but still notice the car shaking at idle, you can check whether the fuel supply pressure and intake pressure sensor are functioning normally. Abnormal fuel pump pressure or incorrect readings and poor performance of the intake pressure sensor can both cause the car to shake.