| Malfunction | Cause and solution |
| The speed is set incorrectly | When the engine is warm, check the idle speed and adjust it |
| Heavy gas pedal travel | The throttle linkage is not installed correctly |
| Loose hose between fuel pump and fuel filter | Secure the hose connection point with a clamp |
| The fuel pump support plate is torn (rear mount) | Check the plate for cracks and breaks, replace it if necessary |
| Air in the fuel system | Remove air from the fuel system |
| The fuel supply system is faulty | The fuel filter is dirty. The fuel outlet and supply lines are dirty, bent or narrowed at the joints |
| The injectors are faulty | Check the injectors, thermal insulation under the injectors |
| The feed start is set incorrectly | Check the feed start setting |
| The fuel pump is faulty | Install a new pump to check |
| The engine has mechanical defects | Check engine mount. Check valve clearance. Check compression ratio. |
| The hollow bolts of the fuel pump inlet and outlet pipes are mixed up | The hollow bolt of the outlet pipe is marked on the hex head with the inscription "OUT" |
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