How often should fuel injectors and throttle bodies be cleaned?

[GabrielFitz]

Fuel injectors are generally cleaned every 2 years or 60,000 kilometers; throttle bodies are typically cleaned approximately every 20,000 kilometers. The following are the impacts of not cleaning fuel injectors and throttle bodies: 1. Slightly dirty: There is no effect on the vehicle, no fault symptoms, and it can be left uncleaned while still functioning normally. 2. Moderately dirty: May cause abnormal noises during engine operation, and failure to clean can lead to increased fuel consumption, reduced power, and worsened comfort. 3. Very dirty: Can result in the vehicle having no idle speed, stalling as soon as the accelerator is released, making normal driving impossible. At this point, cleaning is mandatory. The extent of dirtiness can be detected by checking the throttle opening at idle with a computer. Without a computer, the throttle intake hose can be opened to visually inspect the level of dirt, and a slightly experienced maintenance technician can also determine the degree of dirtiness.