| Malfunction | Reason/Action |
| Unstable speed | Check and adjust idle speed on a warm engine |
| Difficulty moving the gas pedal | Adjust |
| The fuel line between the injection pump and the fuel filter is loose | Secure the clamps |
| The pressure pump retaining plate is cracked | Check. Replace |
| Poor fuel supply | Dirty fuel filter. The fuel injection and return pipelines are dirty, bent or pinched at the connection points |
| Faulty injectors | Check. Faulty injector insulators |
| The timing of the fuel supply is adjusted | Adjust |
| Injection pump faulty | Replace |
| Mechanical engine problems | Check the engine. Compression. |
| Heavy knocking in the engine | Dirt in the fuel system. Replace injectors. Blow the fuel lines |
| Insulators and copper sealing gaskets are installed incorrectly. | Insulators and injector holders burned out. Injector holders are over-tightened. Replace faulty parts. Install correctly |
| The glow rod of the glow plug is broken. Burnt. | Replace a faulty glow plug |
| Air in the fuel system | Check the tightness of the connections, pull with a force of 70 Nm. Install the fuel lines and tighten the nuts to 25 Nm. |
Idling malfunctions
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