What to Do About Carbon Deposits in Sedans?

[OMichael]

Methods for cleaning carbon deposits in vehicles: 1. The engine needs to be disassembled, and then cleaning agents, ultrasonic methods, etc., are used to completely and thoroughly remove carbon deposits from the components. 2. Intravenous cleaning for cars: Hang a bottle-shaped tool above the engine, pour the cleaning agent into the bottle tool, and then introduce it into the engine through a conduit. 3. Machine cleaning: Inject the cleaning agent into a machine, then use the machine to pressurize it into the combustion chamber, allowing the cleaning agent to react with and dissolve the carbon deposits, and then extract the waste liquid. Below is a related introduction to carbon deposits: Vehicle carbon deposits refer to a coking-like substance produced by unsaturated olefins and gums in fuel under high-temperature conditions during engine operation.

[AbigailFitz]

My previous car had carbon buildup issues, often making it difficult to start, reducing power, and noticeably increasing fuel consumption while driving. This is mainly caused by carbon deposits accumulating in the engine's intake system or fuel injectors. I believe prevention is more important than treatment. You can reduce carbon buildup by regularly changing high-quality engine oil and air filters; using fuel additives is a practical method—it cleans the fuel injectors and throttle body, and I felt much more stable idling after using it. Avoid prolonged low-speed driving or idling in daily driving, and take time on weekends to drive at high speeds to rev up the engine, helping burn off some deposits. If symptoms are severe, such as engine shaking, it's time to visit a professional repair shop for cleaning. They use walnut shell blasting or chemical treatments, which are safe and reliable. In short, developing good habits is key—don’t save small money only to spend big on repairs later.

[VonGage]

Carbon deposits typically accumulate in the throttle body, fuel injectors, and intake manifold. When clogged, they can negatively impact engine performance and fuel efficiency. The primary solution is cleaning: you can use specialized fuel additives poured into the gas tank for routine maintenance, which is simple and quick. For severe buildup, professional cleaning methods like walnut shell blasting or intake manifold cleaning are recommended, typically performed every 20,000 kilometers. Prevention is equally important - always use quality fuel and avoid substandard gasoline, while checking air filters for blockages during regular maintenance. Driving habits matter too - maintain smooth acceleration and avoid frequent stop-start cycles. Cost-wise, DIY additives cost around tens of RMB, while professional cleaning may run several hundred RMB but delivers more thorough results. Don't delay treatment - addressing carbon buildup promptly can extend engine life and improve fuel economy.

[AlexanderDella]

A simple and practical DIY method to deal with carbon deposits is to use a fuel cleaner. Purchase a bottle of fuel system cleaner, such as a well-known brand of injector cleaner, pour it into the fuel tank, and fill up with gas—it’s available at supermarkets or auto repair shops, convenient and affordable. Occasionally drive at high speeds on the highway, revving the engine above 3,000 RPM to help burn off deposits. You can also replace the air filter yourself to prevent dust buildup. If you notice slow starts or weak power, promptly use an additive to remedy the issue. Don’t worry about complexity—these steps will help maintain smooth vehicle performance without spending much money or time on major repairs.