Preliminarily check the malfunctions recorded in the memory of the engine management system.
Cause | Elimination Method |
Difficulty starting the engine or the engine does not start at all | |
Diesel engine preheating system not working | Check and, if necessary, repair the diesel engine preheating system. |
Fuel cut-off valve not opening | Check the fuel cut-off valve of the engine control device, as well as the anti-theft system. |
Defect in the fuel supply system | Check the fuel supply system to the engine. |
Fuel lines leaking, blocked inside or deformed | Clean and, if necessary, replace the fuel supply lines. |
Fuel filter dirty | Replace fuel filter. |
In winter, there is water or ice in the fuel filter | Warm up the car in a heated garage. |
Clogged fuel tank vent or dirty fuel filter located in the fuel tank | Clean the fuel tank ventilation system or fuel filter. |
Incorrectly adjusted fuel injection timing | Check and, if necessary, adjust the fuel injection timing. |
Faulty fuel injectors | Check the functionality of the fuel injectors. |
Faulty high pressure fuel pump | Replace high pressure fuel pump. |
The engine only runs at idle | |
Loose fuel hoses on high pressure fuel pump or fuel filter | Attach fuel hoses properly. |
Incorrectly connected supply and return fuel hoses on the high pressure fuel pump | Check that the fuel hoses are connected correctly. |
Increased fuel consumption | |
Fuel filter dirty | Replace fuel filter. |
Leaky fuel system | Check fuel system for leaks. |
Dirty fuel return line | Clean the fuel return line. |
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