What Causes Engine Shaking and Abnormal Noises?
3 Answers
Car engine shaking with abnormal noises can be caused by: dirty throttle body; faulty spark plugs; non-working engine cylinders; aging rubber components inside the engine mounts and transmission mounts. Below is additional information: Introduction to Car Engines: A car engine is the device that provides power to the vehicle, determining its performance, fuel efficiency, stability, and environmental friendliness. Engine maintenance methods include: regular oil and oil filter changes; periodic cleaning of the fuel system, car radiator, and crankcase. Types of Car Engines: Car engines are categorized into diesel engines, gasoline engines, electric vehicle motors, and hybrid motors.
Engine shaking and abnormal noises are common issues I've frequently helped friends with. The most likely culprits are ignition system problems—excessively worn spark plugs or faulty ignition coils can cause individual cylinders to misfire, leading to shaking. Fuel delivery issues are another major cause; clogged fuel injectors or a dirty fuel filter can create uneven air-fuel mixture, exacerbating vibrations. For mechanical problems, damaged engine mounts (rubber isolators) will eliminate vibration damping, making the car shake severely. Regarding abnormal noises: high-pitched squealing often indicates loose belts or seized water pump bearings, while dull metallic sounds warn of impending bearing failure. Neglecting repairs may lead to connecting rod deformation or even complete engine failure—costly repairs. Immediate action: turn off the AC to reduce load, inspect spark plug condition and belt tension. If uncertain, arrange for towing to a repair shop for comprehensive diagnostics.
I also experienced engine shaking and strange noises when driving my old car before, and looking back, it was quite distressing. Most likely, it was due to carbon buildup clogging the throttle, causing uneven air intake and resulting in shaking. Or it could be that the belt tensioner was worn and loose, making a terrifying screeching sound while running. Another time, the engine mount bolts were loose, and the vibration was so obvious I could feel it myself. When driving long-term, you need to pay attention to these small warning signs—don’t ignore them. Insufficient fuel supply from the fuel pump can make the engine struggle to breathe, and frequent shaking just wastes fuel money. To address it, you can first check the belt tension—if it feels loose or has cracks, it’s a sign it needs replacement. Developing a habit of cleaning carbon deposits during regular maintenance can prevent issues. If the shaking gets severe, quickly seek help from an experienced mechanic to avoid breaking down on the highway.
