Engine cranks normally but won't start
- Empty fuel tank
- Starting procedure is incorrect
- Clogged fuel filter
- The fuel contains paraffin and resins (manifests itself in cold weather)
- Shut-off solenoid wiring disconnected or solenoid itself defective
- Faulty preheater
- The fast idle cable is broken or the temperature sensor is faulty
- Injection timing incorrectly adjusted (injection pump)
- Faulty injection pump
- Bad compression (see chapter 1A)
Rough idle engine
- Idle speed incorrectly adjusted
- Faulty injector (nozzles)
The engine does not develop the required power
- Clogged fuel filter
- Clogged air filter
- Fuel contains air or water
- Injection timing incorrectly adjusted (injection pump)
- Faulty injector (nozzles)
Excess fuel consumption
- fuel leak
- Clogged air filter
- Faulty injector (nozzles)
- Injection timing incorrectly adjusted (injection pump)
Knocking when engine is running
- Faulty injector (nozzles) (sticky needle)
- Injection timing incorrectly adjusted (injection pump)
- Excessive carbon buildup in the engine