What Causes Engine Shaking During the Break-in Period of a New Car?
2 Answers
During the break-in period of a new car, engine shaking can be caused by several factors: incorrect installation of the engine's rubber mounts, leading to distortion; excessive carbon buildup on the spark plugs, resulting in engine vibration; or the accumulation of deposits in the fuel system. Additionally, failure to perform timely maintenance, such as oil changes, during the break-in period can contribute to this issue. Extended Information: Solutions for Engine Shaking: 1. Clean Carbon Deposits Promptly: If the throttle body or fuel injectors are malfunctioning—such as a dirty throttle body or excessive carbon buildup on the injectors—gasoline may be absorbed by the deposits, making the vehicle hard to start. Regular cleaning of carbon deposits is essential to avoid unnecessary wear. 2. Inspect the Condition of Spark Plugs: Faulty spark plugs can disrupt the ignition system. Check for excessive carbon buildup and replace them if necessary. 3. Verify Fuel Pressure: Unstable fuel pump pressure can also cause engine shaking. Inspect the fuel pressure and replace any faulty components promptly.
I've been driving for over 20 years. It's quite normal for a newly purchased car's engine to shake during the break-in period, mainly because the parts haven't fully broken in yet. New components inside the engine like piston rings and cylinder walls need time to adapt, and uneven friction can cause increased shaking. If the fuel quality is poor or contains impurities, or if the air filter is dirty and restricts airflow, it can easily make the engine struggle. The shaking is more noticeable during cold starts because the oil hasn't warmed up enough to provide proper lubrication. New drivers who frequently brake or accelerate sharply can also contribute to the problem. My advice is not to worry too much; it usually improves after driving a few hundred kilometers, and maintaining moderate speeds helps with the break-in process. Regularly checking the engine oil and filters is crucial—it prevents minor issues from becoming major problems and extends the engine's lifespan. Remember, a new car is like a baby that needs gentle treatment; don't let the engine suffer.
