What Causes Car Vibration at Speeds Above 130 km/h?

[VanKira]

At that speed range, the engine's vibration frequency becomes close to the natural frequencies of the drivetrain and vehicle body, triggering resonance. Potential causes include: worn/loose component connections, unbalanced driveshaft, incorrect wheel alignment, uneven tire pressure, or bent axle shafts. Detailed explanations: 1. Severe carbon buildup: Can clog spark plugs and valves, directly causing idle vibration. If acceleration deteriorates significantly with persistent shaking, consider engine decarbonization. 2. Unstable fuel mixture: First replace the fuel filter, as prolonged use may cause clogging. 3. Misfiring cylinders: Faulty ignition coils or spark plugs failing to ignite properly will cause noticeable vibration.