My old golden cup sea lion has been emitting black smoke recently, and the bigger the throttle, the more powerful it is. If the intake pressure sensor and oxygen sensor are replaced, this is not enoug

My old golden cup sea lion has been emitting black smoke recently, and the bigger the throttle, the more powerful it is. If the intake pressure sensor and oxygen sensor are replaced, this is not enough. Black smoke is mostly due to insufficient combustion, which leads to increased fuel consumption and decreased power performance.

1. Poor atomization of the injector,

2. Spark plugs, high-voltage lines,

3 Throttle body

4. Valve oil seal

There shouldn't be much problem with the valve, so you should change it.