Symptom: Diesel Knock During Acceleration; Symptom: Irregular Running Of Engine; Symptom: Reduced Power At All Engine Speeds; Symptom: Reduced Power Above A Certain Engine Speed - DAF CF65 Series Service Manual

4
series

SYMPTOM: DIESEL KNOCK DURING ACCELERATION

Possible cause
Poor fuel quality
Air in fuel system
Injector defective
Possible cause
Poor fuel quality
Air in fuel system
Fuel fine filter/coarse filter clogged
Injector(s) mechanically defective or clogged
Injector defective
High-pressure pump or fuel lift pump delivery too
low

SYMPTOM: REDUCED POWER AT ALL ENGINE SPEEDS

Possible cause
Poor fuel quality
Fuel fine filter/coarse filter clogged
Injector(s) mechanically defective or clogged
Mechanical defect of accelerator pedal sensor
High-pressure pump or fuel lift pump delivery too
low

SYMPTOM: REDUCED POWER ABOVE A CERTAIN ENGINE SPEED

Possible cause
Fuel fine filter/coarse filter partially clogged
Injector(s) mechanically defective or clogged
Air leak in inlet system
©
200416

SYMPTOM: IRREGULAR RUNNING OF ENGINE

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CE engine fuel system
Remedy
Drain fuel, flush fuel system, replace the fuel filters
and fill fuel tank with fuel
Check for drawing in of air:
- via the suction pipe
Check the injectors
Remedy
Drain fuel, flush fuel system, replace the fuel filters
and fill fuel tank with fuel
Check for drawing in of air:
- via the suction pipe
Replace fuel fine filter and clean the system
Replace the injectors
Check the injectors
Check:
- the high-pressure pump
- the fuel lift pump
Remedy
Drain fuel, flush fuel system, replace the fuel filters
and fill fuel tank with fuel
Replace fuel fine filter and clean the system
Replace the injectors
Check:
- mechanical connection of sensor/accelerator
pedal
- accelerator pedal sensor
Check:
- the high-pressure pump
- the fuel lift pump
Remedy
Replace fuel fine filter and clean the system
Replace the injectors
Pressure-test the inlet system
DIAGNOSTICS
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1