Golf 4l washing throttle valve

Hello, dear users, the reply to the question 1 is: after cleaning, I see that your car emits carbon deposits, which are a little dark gray, and are the substances left in the three-way catalytic converter and muffler after cleaning the engine. The vehicle can clean up the carbon deposit after driving for a period of time. The answer to question 2 is: Obviously, the loud noise of the muffler may also be caused by carbon deposition. The answer to question 3 is: after cleaning the throttle and nozzle, it may not be able to save fuel for the vehicle. Sometimes just after cleaning the throttle nozzle, the vehicle will need some oil in a short time. Cleaning the throttle and nozzle is mainly to solve the fault of the vehicle. I hope the above answers are helpful to you, thank you!

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