Table of contents: The engine does not start or starts…🠇 The engine runs jerkily at idle and…🠇 Too high fuel consumption 🠇
Before troubleshooting, the following conditions must be met.
Incorrect actions when starting the engine must be excluded. There should be fuel in the tank, the fuel system pressure and compression are normal, the battery is charged, and the starter rotates with sufficient speed. Contact a workshop to read the codes registered by the self-diagnostic system.
Caution! If high-pressure fuel lines are removed, their joints must first be cleaned using a cold-cleaning agent.
The engine does not start or starts poorly
The fuel supply is insufficient. The fuel supply system is faulty
Check if fuel is supplied:
- a) fuel hoses are pinched, clogged, leaky, porous, or have a loose fit
Clean the fuel lines.
- b) the fuel filter is clogged
Replace the fuel filter.
- c) in winter. The fuel in the filter or pipes has frozen or thickened
park your car in a heated garage. Check the condition of the fuel filter heater
- d) the fuel tank ventilation is clogged, the mesh filter in the tank is dirty
Clean the ventilation and filter mesh.
The injectors are faulty
Check the injectors by loosening the high pressure fuel line union nuts one at a time and ensure the cylinders are operating.
The engine runs jerkily at idle and when starting off
Poor connection of fuel hoses to the injection pump or fuel filter
Replace the fuel hoses, secure them with clamps, tighten the hollow bolts.
The fuel supply and return lines are reversed
Check the fuel line connections.
The fuel supply is insufficient. The fuel supply system is faulty
Check if fuel is supplied:
- a) fuel hoses are pinched, clogged, leaky, porous, or have a loose fit
Clean the fuel lines.
- b) the fuel filter is clogged
Replace the fuel filter.
- c) in winter. The fuel in the filter or pipes has frozen or thickened. Check the condition of the fuel filter heater K. Park the car in a heated garage.
- d) the fuel tank ventilation is clogged, the mesh filter in the tank is dirty.
Clean the ventilation and filter mesh.
The injectors are faulty
Check the injectors by loosening the high pressure fuel line union nuts one at a time and ensure the cylinders are operating.
Too high fuel consumption
The air filter is dirty
Replace the air filter element.
The fuel system is leaking
Perform a visual inspection of all fuel lines (supply, outlet and main).
The fuel return line is clogged
Blow out the outlet pipe from the high-pressure fuel pump to the fuel tank.
Increased idle speed or maximum allowable speed
Check. Print out the codes of the faults registered by the self-diagnostic system.
The engine has mechanical damage
Check the compression or overhaul the engine. Remove dents from the exhaust system.
The injectors are faulty
Check the injectors by loosening the high pressure fuel line union nuts one at a time and ensure the cylinders are operating.