What are the reasons for the EPC light coming on and the car shaking?
2 Answers
epc light coming on and the car shaking are caused by: 1. Intake system failure, such as leaks or blockages; 2. Dirty throttle body with excessive carbon deposits; 3. Use of substandard fuel; 4. Abnormal cylinder pressure and poor working conditions; 5. Valve failure, sticking or carbon deposits; 6. ECU failure; 7. Sporadic faults or false alarms. The EPC corresponds to the electronic throttle, which is an important control component of the car engine, ensuring precise control of the throttle opening. If any of the above reasons occur, the electronic throttle cannot accurately adjust the throttle opening, leading to a decrease in engine power and resulting in car shaking.
I've experienced the EPC light coming on with engine shaking – most likely a dirty throttle body! Last time my car suddenly vibrated like a massage chair, and inspection revealed the throttle was clogged like a sewer pipe, with excessive carbon buildup restricting airflow. Worn spark plugs can also cause this – when electrodes erode, ignition becomes inconsistent. Don't forget to check the intake system; aging rubber hoses may develop vacuum leaks, disrupting the air-fuel mixture. Interestingly, even a faulty brake light switch (though rare) can trigger EPC illumination and cause jerking. The worst-case scenario is wiring issues – a loose sensor connector can send erratic signals. Address this promptly, as continued driving may damage the catalytic converter.
