Great Wall C30 engine sound is incorrect, what's the matter?

1, the air inlet is blocked or the oil circuit is not smooth.

2. The throttle is dirty.

3. The engine belt is loose.

4. The dynamic balance of the wheel or crankshaft flywheel is damaged.

5. There is no fuel injection in the cylinder of the engine; It also causes some cylinders not to do work; Cause jitter noise; Low power consumption.

Suggestion: After-sales maintenance, safety is the most important.