Why does the engine make a clicking sound when starting?

[GabrielAnn]

The direct fuel injection system in the cylinder produces a clicking sound after starting, which is a normal phenomenon. This noise from the direct injection engine is unavoidable. 1. Pros and cons of the technology: Every technology has its advantages and disadvantages. The benefit of direct injection technology is that it improves engine power and reduces fuel consumption, while the downside is that it is noisy and prone to carbon deposits. 2. Effective measures: Many direct injection engines develop noticeable carbon deposits on the piston top and valves after driving 20,000 kilometers. It is recommended that owners of direct injection engines clean the carbon deposits every 20,000 kilometers. A good method for cleaning carbon deposits is the walnut shell blasting method.