What are the symptoms of carbon buildup in a car?

[BradyLee]

Symptoms of carbon buildup in a car include the following: 1. Difficulty starting the engine when cold, requiring multiple attempts, while it starts normally when warm. 2. Unstable engine idle speed, fluctuating between high and low. 3. Poor acceleration response when revving, with a noticeable sluggishness. 4. Reduced driving power, especially noticeable during overtaking, with slower acceleration and failure to reach the car's original power level. 5. Highly irritating and pungent exhaust emissions, significantly exceeding standards. 6. Noticeably increased fuel consumption compared to before. Carbon buildup reduces engine power, increases fuel consumption, and in severe cases, can cause valve sealing issues. Treatment methods include the following: 1. Carbon buildup in the intake tract can be cleaned during maintenance at a repair shop. 2. If not severe, driving at high speeds can also help remove carbon buildup, as the high-speed airflow can wash away carbon deposits in the intake tract. 3. Adding fuel additives, such as products like "fuel system cleaners," can help keep the fuel cleaner and also clean existing carbon deposits while slowing down their formation.