Pull off the exhaust gas circulation throttle valve and deposit carbon.

Because there is an exhaust pipe in front of the throttle, the oil and gas discharged from the exhaust pipe combines with the trace dust at the air inlet, resulting in sludge similar to carbon deposition on the throttle plate. Generally, the throttle feels stuck or needs cleaning after driving for about 20,000 kilometers. In addition, the air filter element should be cleaned frequently to ensure a good air intake environment and reduce carbon deposition and sludge in the throttle.