What Causes Vehicle Shaking During Acceleration?
2 Answers
Common causes of vehicle shaking during acceleration: 1. Dirty throttle body or excessive carbon buildup in fuel injectors. When there's too much carbon deposit inside the engine, the gasoline sprayed by cold start injectors gets largely absorbed by the carbon deposits, resulting in an overly lean air-fuel mixture during cold starts and making ignition difficult. 2. Uneven pressure distribution between the driving and driven plates. Issues like uneven spring pressure in the clutch pressure plate, inconsistent adjustment of release levers, and/or uneven diaphragm spring fingers can cause asynchronous engagement timing, uneven pressure plate force distribution, or even plate tilting, leading to poor contact between driving and driven plates and resulting in clutch shudder. 3. Weakened damping springs. When the torsion damping springs in the clutch lose their elasticity, when the clutch pressure plate springs weaken, or when diaphragm springs develop cracks, all these can cause shaking during clutch engagement.
I've experienced body shaking during startup several times, which is usually due to clutch issues or loose engine mounts. If the clutch disc is worn or oil-contaminated, it will slip during startup, causing the body to wobble. If the engine mounts are aged, the engine will vibrate the body when starting. I usually enjoy tinkering with my car myself, first checking if the clutch pedal feels loose, then inspecting the engine mounts for cracks or gaps. Another common cause is unbalanced drive shafts or uneven tire pressure, especially more common in older cars. It's recommended to quickly check the mounts and clutch fluid level before each drive to reduce unexpected shaking. If the shaking persists, it's time to visit a professional shop – don't force driving it to avoid damaging other components.
