FL -18
FUEL SYSTEM
(SYMPTOM 3) POOR STARTING WHEN HOT
Possible Cause
• The compensation of individual injector not adapted
• Drift of the rail pressure sensor not detected
• Electric EGR control valve blocked open
• Fuel pressure regulator valve contaminated,
stuck, jammed
• Rail pressure regulator valve contaminated,
stuck, jammed
• Air filter sealed
• Air ingress in the low pressure fuel circuit
• Fuel quality / presence of water
• Fuel return circuit of the pump sealed
• Sealed fuel filter
• Engine compression too low
• Intermittent fault connection
• Carbon deposit on the injector (sealed holes)
• Needle stuck (injection possible over a
certain pressure)
• Gasoline in fuel
• Bug software or hardware fault not detected
(SYMPTOM 4) UNSTABLE IDLING
Possible Cause
• Fuel return hose of injector cut
• The compensation of individual injector not adapted
• Drift of the rail pressure sensor not detected
• Harness resistance increased
• Air ingress in the low pressure fuel circuit
• Fuel quality / presence of water
• Sealed fuel filter
• Air filter sealed
• Fuel return hose of injector sealed
• High pressure leakage
• Glow system faulty
• Engine compression too low
• Bad flanging of the injector
• High pressure pump out of order
• Injector not adapted
• Carbon deposit on the injector (sealed holes)
• Needle stuck (injection possible over a
certain pressure)
• Injector jammed open
• Electric EGR control valve blocked open
(SYMPTOM 5) IDLE SPEED TOO HIGH OR TOO LOW
Possible Cause
• Drift of the engine coolant temperature
sensor not detected
• Incorrect state of the electrical pack devices
• Alternator or voltage regulator faulty
• Clutch not well set
• Bug software or hardware fault not detected
• Electric EGR control valve blocked open
• Throttle control actuator faulty
(SYMPTOM 6) BLUE, WHITE, OR BLACK SMOKES
Possible Cause
• The compensation of individual injector not adapted
• Drift of the engine coolant temperature
sensor not detected
• Drift of the rail pressure sensor not detected
• Electric EGR control valve blocked open
• Fuel pressure regulator valve contaminated,
stuck, jammed
• Rail pressure regulator valve contaminated,
stuck, jammed
• Oil level too high/too low
• Fuel quality / presence of water
• Catalytic converter sealed or damaged
• Air filter sealed
• Oil suction (engine racing)
• Glow system faulty
• Engine compression too low
• Bad flanging of the injector
• Injector washer not adapted, forgotten, doubled
• Injector not adapted
• Carbon deposit on the injector (sealed holes)
• Injector jammed open
• Gasoline in fuel