What are the reasons for the engine malfunction indicator light being on and the car shaking?
2 Answers
The reasons for the engine malfunction indicator light being on and the car shaking are: 1. Poor gasoline quality leading to incomplete combustion of the air-fuel mixture in the cylinder, resulting in carbon deposits; 2. Excessive engine mileage causing weakened spark plug performance; 3. Vehicle mechanical aging or damage; 4. Sensor or computer board malfunction. Hazards of the engine malfunction light being on: 1. Deterioration in the quality of vehicle exhaust emissions, polluting the environment; 2. Increased combustion chamber temperature and accelerated wear, leading to engine damage; 3. Causing the engine to burn oil; 4. Increased engine noise, affecting driving and passenger comfort. The function of the engine: To convert the thermal energy of gasoline into mechanical energy by burning and expanding gas in a sealed cylinder, thereby pushing the piston to perform work.
As a veteran driver with twenty years of experience, I've encountered many instances where the engine warning light came on accompanied by shaking. The most common cause is an issue with the ignition system—either worn-out spark plugs or a faulty ignition coil—resulting in a cylinder misfire. Last time, replacing the spark plugs fixed the problem immediately. Another frequent issue is fuel system problems, such as clogged fuel injectors or an unstable fuel pump, causing the engine to 'gasp' due to insufficient fuel supply. If you've filled up with substandard gasoline at a gas station, impurities clogging the fuel lines can also cause this. Additionally, a faulty mass airflow sensor or throttle position sensor can lead to inaccurate air intake calculations by the ECU, making the engine shake like it's coughing. I remember one winter when this happened during a cold start—it turned out the oxygen sensor was frozen. Never ignore the engine warning light; get the trouble codes read immediately. Sometimes, a simple sensor replacement can solve the issue.
