Is it necessary to clean the throttle for in-cylinder direct injection engine?

No matter what kind of fuel engine, it is necessary to clean the throttle regularly, generally 20,000-40,000 kilometers. The normal throttle opening should be 3%, and the throttle opening will increase with the increase of sludge carbon deposition. When the throttle opening reaches above 7%, it needs to be cleaned. If it is not cleaned, the idle speed will be unstable.