The D25TCIF 1 engine vibrates when it is inflated, making a lot of noise.

The reason of engine noise jitter is that the throttle valve is too dirty or the injector has too much carbon deposit.

When there is too much carbon deposit in the engine, the gasoline sprayed by the fuel injection head will be absorbed by a large amount of carbon deposit during cold start, which leads to too thin mixture during cold start, difficult start, and thin and thick combustible mixture of the engine, which leads to idling jitter after cold start. Too much oil will produce greater unnecessary resistance to crankshaft work, which will further affect power output and increase fuel consumption. The amount of engine oil entering the combustion chamber will greatly increase, which will also increase the carbon deposition in the combustion chamber, increase the resistance of piston movement and reduce the power of the engine. Secondly, if there is too much oil, it will increase the mixing resistance of the crankshaft connecting rod and the noise will also increase.