Jetta's idle speed is unstable

Because the structure of carbon deposit is similar to sponge, when the valve forms carbon deposit, a part of the fuel injected into the cylinder will be adsorbed every time, which will dilute the concentration of the mixed gas that really enters the cylinder, leading to poor engine work, difficulty in starting the cold car, or parking. You'd better check whether the carbon deposit in the engine is serious, and you'd better disassemble it. Because the cleaning effect of disassembly-free cleaning on kilometers will be reduced. Because the carbon deposit has the function of adsorbing gasoline, when the car is hot, the carbon deposit will soften and the adsorption will decrease, so the car will not be damaged. If carbon deposition is serious, the values of air flow meter and oxygen sensor will be very high, and it is necessary to observe whether the data flow is within the normal range after cleaning.

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