What causes engine shaking in a cold Volkswagen Passat?
1 Answers
During cold starts, the car shakes because the combustion in the cylinders is inefficient, resulting in insufficient power output. Below are detailed explanations regarding the cold engine shaking in the Passat: 1. Insufficient engine temperature: Both fuel and lubricant temperatures are too low, requiring additional fuel injection during cold starts to meet power demands. 2. Increased spark plug gap: Prolonged use can cause the spark plug's ignition gap to widen, reducing ignition energy and subsequently affecting power output, leading to car shaking. 3. Aging ignition coils: Deterioration or leakage in the spark plug's high-voltage wires can decrease ignition energy.