What are the symptoms of severe carbon buildup in the intake manifold?

2 Answers
VanRicardo
07/25/25 7:58am
The symptoms of severe carbon buildup in the intake manifold include severe engine shaking, poor acceleration, and excessive fuel consumption. Formation of carbon deposits: After a vehicle has been used for a certain period, carbon buildup in the engine is inevitable. Initially, the carbon deposits are soft and muddy residues, but over time, they become hardened due to combustion, forming carbon deposits. If not cleaned and prevented in time, they can easily lead to traffic safety accidents. Therefore, it is important to promptly identify the carbon buildup condition of the vehicle and clean the engine. Prevention methods: During regular vehicle use and maintenance, it is essential to use high-quality gasoline. High-quality gasoline with good cleanliness produces fewer carbon deposits. Additionally, adding a high-quality cleaner to the gasoline can further prevent the formation of carbon layers. Regular cleaning of the intake system during vehicle use is also recommended.
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VanVanessa
08/10/25 6:44pm
Having driven for decades, the most obvious symptom of severe carbon buildup in the intake manifold is the car's lack of power. Even with the accelerator pedal floored, it feels like something is dragging the car, especially when climbing hills. Fuel consumption also skyrockets—a full tank of gas might only last a few hundred kilometers, which really hurts the wallet. At idle, you can hear the engine shaking badly, almost like it's coughing, and the car rocks back and forth uncomfortably at red lights. Cold starts can also be difficult, particularly in winter, requiring multiple key turns before the engine fires up. All these issues stem from carbon deposits clogging the intake pipes, restricting airflow and degrading the air-fuel mixture. It's recommended to regularly clean the intake system or avoid frequent city driving in heavy traffic. Taking the car on the highway more often can help clear out deposits, preventing costly engine repairs down the line.
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