If the compression pressure of a cylinder of a diesel engine is normal, the maximum explosion pressure decreases and the exhaust temperature increases, how to adjust it correctly? Why?

1, air and diesel need insufficient oxygen, and combustion is insufficient. The remaining fuel is discharged into the exhaust pipe and ignited at high temperature, so the exhaust temperature rises.

2. If it is a mechanical fuel injection pump, the atomization at the fuel nozzle is not good.

3. The supply of diesel oil is small.

4. The valve opening time is a little earlier.