How to Solve the Shaking Issue When Starting a Cold Volkswagen Sagitar?
1 Answers
Severe shaking during cold starts of the Volkswagen Sagitar is generally related to the fuel injection system, ignition system, and idle control system. Below are relevant explanations about cold starts: 1. The primary cause of cold start shaking is low temperature. The engine's internal temperature is insufficient, so more fuel should be injected during cold starts to meet power requirements. 2. The larger the spark plug gap, the smaller the ignition energy. At low temperatures, fuel atomization is poor, requiring higher ignition energy. Over time, the spark plug's ignition gap tends to widen, leading to reduced ignition energy, which affects power performance and causes the car to shake. Additionally, aging ignition coils, high-voltage wires of spark plugs, or electrical leakage can also result in decreased ignition energy. 3. Inaccurate air-fuel mixture ratio occurs in both open-loop and closed-loop controls. If the car's computer makes an incorrect judgment, errors in controlling the air-fuel mixture and ignition timing through the actuators may reduce the car's power output, causing shaking. 4. Carbon deposits. Excessive carbon buildup on the valves and intake manifold can make cold starts difficult, as carbon deposits can absorb an appropriate amount of fuel, leading to ECU judgment errors.
