What are the reasons for severe carbon buildup in fuel injectors?
2 Answers
The reasons for severe carbon buildup in fuel injectors are: 1. Insufficient oxygen supply, which prevents complete combustion of the gas in the cylinder; 2. Frequent driving in congested road conditions, where fuel enters the combustion chamber but fails to burn completely. The fuel injector is located on the intake manifold of the direct-injection cylinder block, and its functions are: 1. To facilitate complete combustion; 2. To supply fuel to the engine. The working principle of a fuel injector is: When the electromagnetic coil is energized, it generates suction, lifting the needle valve and opening the injection hole. Fuel is sprayed at high speed through the annular gap between the needle valve head and the injection hole, forming a mist.
After driving for so many years, I've found that severe carbon buildup in fuel injectors mostly stems from fuel quality and driving habits. When I used cheap or low-quality gasoline, the impurities and moisture content were high, leading to residue and blockages during injection. Plus, since my workplace is close to home, I mostly drive short distances—turning off the engine before it fully warms up leaves unburned fuel that accumulates as carbon deposits. A mechanic told me this is also related to air intake; if the air filter is dirty, the air-fuel mixture becomes richer, making carbon buildup more likely. Later, I switched to higher-grade fuel from reputable gas stations and started taking weekly highway drives to rev the engine and flush out carbon deposits, which significantly alleviated the issue. Neglecting these details can cost a lot of time and money for fuel injector repairs.
