What are the impacts of severe engine shaking in a car?

[LeRemington]

Severe engine shaking in a car can lead to excessively lean or rich air-fuel mixture, incomplete combustion of the mixture in the cylinders, and imbalance in power output among cylinders. Below is an introduction to the engine: Definition: An engine is a machine that converts other forms of energy into mechanical energy. Classification: Internal combustion engines, external combustion engines (such as Stirling engines, steam engines, etc.), jet engines, electric motors, etc. Composition: The engine block assembly mainly consists of components such as the cylinder block, cylinder liner, cylinder head, and cylinder gasket. Causes of severe engine shaking include: Severe engine carbon buildup, ignition system issues, aging engine components, and unstable oil pressure.

[ColtonRose]

Last time I was on a business trip driving on the highway, I encountered severe engine shaking, and the car body was vibrating like sitting on a massage chair. This issue should not be taken lightly. Not only did the steering wheel shake so much that my hands went numb, but over time, the parts would suffer. The exhaust manifold even cracked on the way. The mechanic said the shaking could cause metal fatigue in the mounting brackets, loosen connecting bolts leading to oil leaks, and crack exhaust pipe gaskets. The most critical part is the damage to the engine itself. Long-term imbalance can lead to crankshaft bearing wear and piston ring seal failure, with repairs often costing over ten thousand. Sudden engine stalling at high speed is even more dangerous. It scared me so much that I now regularly check the engine mounts and spark plugs.

[LouisDella]

My old car had been shaking for three months without attention, and when it was finally opened up, the sight was horrifying. The violent engine vibrations caused cracks and air leaks in the intake pipe, messing up the air-fuel mixture and completely frying the oxygen sensor. The plastic parts under the steering wheel had their clips shaken loose, producing rattling noises like a fast clapper. The most painful part was the transmission suffering collateral damage—the output shaft's shaking accelerated gear wear, making gear shifts feel like a kick in the rear. The mechanic said this issue was like letting a cold turn into pneumonia; replacing the engine mounts early could have fixed it for just a few dozen bucks, but in the end, it cost me over 4,000 to replace the flywheel.

[StJeffrey]

If the engine shakes like it's dancing, it's likely misfiring. If any one of the four cylinders isn't working properly, it can throw the entire crankshaft off balance. Common causes include a burnt ignition coil or carbon buildup on the spark plugs. Long-term misfiring can cause serious damage: unburned gasoline can flood the exhaust pipe, poisoning and disabling the catalytic converter; the oil pan bolt can vibrate loose, causing oil leaks; the electronic throttle connector can shake loose, leading to sudden fuel cutoff. Once, my friend's turbocharged car kept shaking until the wastegate got stuck, causing turbo pressure to spike—nearly blowing the intercooler apart.