Abnormal noise of Beetle engine

The solution of Beetle engine noise: 1. There is too much carbon deposit in the engine, the fuel is not fully burned in the engine, or the paraffin colloid substances that can not be completely burned in gasoline remain in the nozzle, throttle, oil pipe, spark plug and other parts, forming carbon deposit under the action of high temperature; 2. The most common cause of automobile jitter is that the throttle valve is too dirty or the fuel nozzle has too much carbon deposit, because the fuel adsorbed on the carbon deposit after landing is sucked into the cylinder by the engine for combustion, and the combustible mixture of the engine is thin and thick, which leads to idling jitter after cold start; 3. If it is not handled in time, it will also cause the phenomenon of power decline, lack of speed increase and obvious increase in fuel consumption. In severe cases, the cylinder may be pulled and the engine may be scrapped; 4. Solution: It is also possible to clean the oil circuit, refuel the engine oil and add some fuel cleaning agents.