What Causes Sudden Engine Vibration in a New Car?
2 Answers
Reasons for sudden engine vibration in a new car: 1. Aging or loosening of engine mounts. Engine mounts are rubber blocks placed between the engine and the frame to reduce vibration and provide cushioning during engine operation, as well as to secure the engine. Once the engine mounts age or become loose, engine vibration becomes noticeably abnormal; 2. Engine misfire. The exhaust gas flow from the car shows obvious intermittency, the exhaust pipe shakes violently, and the engine vibration can be clearly felt; 3. Carbon buildup issues. Carbon deposits include cylinder carbon buildup, throttle carbon buildup, spark plug carbon buildup, and intake carbon buildup. When there is excessive carbon buildup inside the engine, the car's ignition energy decreases, intake efficiency drops, leading to engine vibration symptoms; 4. Cold start. During a cold start, the engine's lubrication is poor, the oil has low fluidity and is more viscous, resulting in mechanical wear noises. Additionally, during a cold start, the coolant temperature is low, the air-fuel mixture is rich, and incomplete combustion can cause engine vibration.
The new car's engine suddenly starts shaking, and I think it's worth discussing in detail. There are several common reasons for this. It could be an issue with the ignition system, such as carbon buildup on the spark plugs or aging ignition coils, causing a cylinder to misfire, making the engine shake like it's trembling. The fuel system is also prone to problems; insufficient fuel pump pressure or clogged fuel injectors can lead to uneven fuel spraying and incomplete combustion, resulting in shaking. On the air intake side, a dirty air filter or a malfunctioning air flow meter can restrict air intake, causing the air-fuel mixture to be too lean, which also induces shaking. Faulty sensors, like a crankshaft position sensor misreading the engine speed, can confuse the engine control unit. Engine mounts in new cars are usually fine, but if they weren't tightened properly during assembly, loose bolts can cause vibrations. If the cooling system shows abnormal water temperature, high temperatures might worsen the shaking. I recommend not driving around recklessly; instead, pull over immediately to check the dashboard warning lights and contact the dealership to scan for trouble codes. New cars come with warranties, so it's safer to let the experts handle it.
