What Causes Engine Shaking in a New Car?
2 Answers
Reasons for engine shaking in a new car: 1. Deterioration or loosening of engine mounts: Engine mounts are designed to reduce vibration and absorb shocks during engine operation, while also securing the engine in place. If the mounts become worn or loose, engine shaking becomes noticeably severe; 2. Engine misfire: The exhaust flow from the vehicle shows obvious intermittency, accompanied by severe shaking of the exhaust pipe, making the engine vibration clearly noticeable, sometimes with a sputtering sound; 3. Cold start: During a cold start, the engine's lubrication is less effective, and the engine oil has poor fluidity and is more viscous, leading to abnormal noises from mechanical friction. Additionally, low coolant temperature, overly rich air-fuel mixture, and incomplete combustion can cause the engine to shake.
The issue of engine shaking in new cars, I've just helped several friends solve it. The most common cause is ignition system failure, such as improper spark plug gap setting or internal short circuit in the ignition coil, leading to uneven cylinder ignition. Fuel system problems are also common; if a new car uses low-quality fuel or water mixes into the fuel tank, it can cause fuel injector clogging or poor fuel supply. Improperly fixed engine mounts from the factory can exacerbate shaking, and prolonged conditions like this will wear out parts. Sensor failures, such as incorrect throttle position signals or inaccurate oxygen sensor readings, make the ECU adjustments imprecise. Internal engine components may also shake due to lack of coordination during the break-in period. It's essential to promptly visit a 4S shop for a computer diagnosis to prevent minor issues from worsening and affecting fuel consumption and lifespan.
