Reasons for New Car Engine Vibration?
2 Answers
New car engine vibration can be attributed to the following reasons: 1. Intake manifold or various valve leaks. Leakage can cause abnormal engine air intake, resulting in either too rich or too lean air-fuel mixture, leading to irregular engine combustion and idle vibration. 2. Excessive carbon deposits on the throttle valve and intake passages. Too much carbon buildup and dirt on the throttle valve and surrounding intake passages change the cross-sectional area of the air passage, preventing the control unit from accurately regulating idle air intake. This results in improper air-fuel mixture and abnormal combustion. 3. Inaccurate air intake. The control unit receives incorrect signals from the air flow sensor and issues wrong commands, causing inaccurate idle air intake. The improper air-fuel mixture concentration leads to abnormal engine combustion, which is an indirect cause of unstable idle.
I just experienced this with my new car too. After consulting a technician, I learned several possible causes: the most common is spark plug or ignition coil issues, which can cause a cylinder to misfire, making the engine jerk; another is fuel system problems, like unstable fuel pump pressure or clogged injectors leading to uneven fuel delivery; carbon buildup is also common—don’t assume new cars are immune, as low-quality gasoline can quickly dirty the throttle body; another easily overlooked issue is engine mounts—poor installation or premature aging of the rubber parts can amplify vibrations; lastly, check the mass airflow sensor—if faulty, it directly affects air intake. New car shaking often relates to these components. Get to a dealership ASAP for a diagnostic scan to pinpoint the issue.
