What are the pros and cons of engine carbon cleaning?

[Beth]

"Carbon cleaning" is also known as the chemical carbon removal method, commonly referred to as "fuel injector cleaning." It uses chemical reactions to alter the molecular structure of substances like gum deposits in carbon buildup, thereby achieving cleaning. Carbon buildup accumulates over time and can generally be prevented with timely engine maintenance. Below are the pros and cons of engine carbon cleaning: Pros of engine carbon cleaning: It can promptly resolve issues such as difficulty starting the engine, reduced engine power, and easy valve burn-out. Carbon cleaning is essential for maintaining engine cleanliness. Cons of engine carbon cleaning: The drawbacks of engine carbon cleaning may include increased engine noise, higher fuel consumption, and the relatively high cost of the procedure when performed at a 4S dealership.

[BriellaLynn]

As an ordinary driver with over a decade of experience, I remember when my car had difficulty starting and shook violently at idle, so I took it to a repair shop for an engine carbon cleaning service (commonly called "drip cleaning" in China). The whole process was quick, completed in less than half an hour, costing around 200 yuan. After the cleaning, throttle response noticeably improved, acceleration became smoother, fuel consumption decreased slightly, and the driving experience was much more comfortable. However, the problem is that the effects only lasted three to four months before carbon buildup issues resurfaced. I've heard that frequent cleaning on older cars might corrode sensors or components, especially with poor-quality cleaning agents, potentially harming the engine in the long run. I think this method is useful in emergencies to avoid sudden failures caused by performance degradation, but with regular maintenance—like changing air filters periodically and using fuel additives—you can delay the need for drip cleaning. Overall, it's a supplementary measure, not a primary solution.

[JaylaLynn]

I'm a car enthusiast who loves studying vehicle maintenance in my free time. The benefit of an engine carbon cleaning ("drip method") is that it quickly removes intake tract carbon deposits, improves fuel mixture, enhances power output and exhaust emissions, makes engine sounds smoother during driving, and is relatively affordable at just a couple hundred yuan. However, there are several drawbacks: if the wrong type of cleaner is used or the procedure isn't performed correctly, chemical residues may remain, potentially corroding sensors, fuel injectors, and other components; the cleaning process might remove protective lubrication films, accelerating internal engine wear; compared to modern walnut shell blasting cleaning, the drip method is less efficient and provides shorter-lasting results. My recommendation is to prioritize gentler maintenance approaches, such as adding detergent during oil changes. Avoid blindly opting for drip cleaning to prevent turning minor issues into major damages.

[LilyAnn]

From a cost perspective, the advantage of engine carbon cleaning ("drip cleaning") is its relatively low price, typically around 200 RMB, which is cheaper than major repairs. If it successfully removes carbon deposits and restores engine efficiency, it can be quite worthwhile—saving fuel and extending vehicle lifespan. The downside is potential wasted money; if the root issue isn't carbon buildup (e.g., spark plug wear or fuel pump failure), the treatment becomes ineffective. Moreover, cleaning effects may be short-lived, requiring repeat spending within months. Personally, I'd rather invest in prevention—using quality fuel/additives or getting free diagnostics to identify the real issue first.