What Causes Sudden Engine Vibration in a New Car?

[Avery]

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.

[DiCarter]

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.

[VanRicardo]

I've also experienced engine shaking in a new car before. The car would jerk while driving, which was quite annoying. It's mostly a simple issue, like spark plugs getting carbon deposits from using low-quality gasoline. When a cylinder misfires, it feels like the engine is dancing. In the fuel system, poor fuel quality can clog the injectors, causing inaccurate fuel spray and incomplete combustion, making the shaking worse. If the air filter is clogged with dust and can't intake air properly, the air-fuel mixture ratio gets messed up. Sometimes new car sensors can be overly sensitive - if the oxygen sensor or idle control motor acts up, it causes shaking. You can try restarting the engine to see if it helps, and check if the engine oil level is sufficient, as low oil pressure might also be the culprit. Remember that shaking in new cars usually isn't a major problem - don't rush to disassemble parts, just let the dealer handle it. If sudden shaking occurs while driving, slow down and turn on hazard lights first - safety comes first.

[Dean]

New car engine shaking, I guess it's a common fault point to check. Worn or carbon-fouled spark plugs can cause weak ignition, leading to insufficient power in a single cylinder and resulting in shaking. Insufficient fuel pressure or a faulty fuel pump can cause unstable fuel supply, leading to incomplete combustion. A dirty air flow meter can affect the intake air volume control, causing errors. Leaking vacuum hoses allow excess air to enter the engine, disrupting the air-fuel mixture and causing shaking. Simple checks: Listen for abnormal engine sounds during startup or observe if the tachometer jumps significantly. It's recommended to inspect the air filter for cleanliness and check the spark plug condition yourself. If unresolved, promptly seek repair to prevent chain issues. Shaking affects driving comfort; timely repairs can prevent engine damage.