What is the reason for the severe shaking of the Audi A6L when starting cold?
2 Answers
The reason for the severe shaking of the Audi A6L when starting cold is: excessive carbon deposits on the valves, which leads to insufficient air intake when the engine is cold, resulting in poor combustion in the cylinders and causing engine shaking and unstable idle speed. Taking the 2020 Audi A6L as an example, it belongs to the mid-to-large-sized car category, with body dimensions of: length 5038mm, width 1886mm, height 1475mm, wheelbase 3024mm, and fuel tank capacity 73l. The 2020 Audi A6L has a front suspension of five-link independent suspension and a rear suspension of five-link independent suspension. It is equipped with a 2.0l turbocharged engine, with a maximum horsepower of 190ps, maximum power of 140kw, maximum torque of 320nm, and is paired with a 7-speed dual-clutch transmission.
As an Audi A6L owner, I have experienced severe shaking during cold starts, which is usually caused by issues in the ignition system. For example, worn-out spark plugs or faulty ignition coils can lead to unstable ignition when the engine is cold, resulting in vehicle shaking. The fuel system is also a critical factor—clogged fuel injectors or insufficient fuel pump pressure can cause uneven air-fuel mixture, especially in low temperatures, making the problem more pronounced. Carbon buildup in the intake manifold or throttle body can disrupt airflow and worsen the shaking. A malfunctioning coolant temperature sensor may mislead the ECU, causing idle control failure. In summary, inspecting ignition components and the fuel injection system is the first step, and replacing parts or cleaning the throttle body when necessary can improve the situation. Regular maintenance, such as oil changes and using high-quality gasoline, can prevent such issues and ensure driving safety.
