D04 ENGINE NOT RUNNING SMOOTHLY - Alfa - 156 - eLearn

3233017 - D04 ENGINE NOT RUNNING SMOOTHLY

The engine does not run smoothly in all conditions (load, speed, etc.). This problem is accompanied by noise and vibrations coming from the engine.

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
	Preliminarily check: the seal of the fuel pipes and connectors the condition of the air intake circuit	Continue to Step 1	Fuel pipes damaged	Renew or replace the pipes (see Assembly 1040B)
		Continue to Step 1	Air intake circuit component damaged	Replace the component (see Assembly 1048A)
1	CHECKING WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Connect the diagnostic equipment (Examiner or other instruments) to the diagnostic socket check that there are no faults in the engine management control unit the plausibility of all the parameters.	Continue to Step 2	An error is detected in the control unit	Continue according to the instructions for the diagnostic equipment
		Continue to Step 2	Lack of dialogue with the control unit	Restore the connection between the engine management control unit and the diagnostic connector ( See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT ).
2	CHECK ON FUEL FILTER	All OK	Problems met	Operation
	Check the condition and cleanliness of the fuel filter:	Continue to Step 3	Filter dirty	Replace the filter element Op. 1044B20 Restore the condition of the filter, the pipes and the heater device
	Check the condition and cleanliness of the fuel filter:	Continue to Step 3	Filter faulty or damaged	Replace the filter Op. 1044B10
3	LOW PRESSURE CHECK	All OK	Problems met	Operation
	Check the fuel supply circuit, low pressure side: if necessary, use the diagnostic equipment (Examiner) to measure the pressure values	Continue to Step 4	Pressure not correct: fuel filter faulty	Replace the fuel filter Op. 1044B10
			Pressure not correct: electric pump faulty	Replace the electric pump Op. 1040A70
			Pressure not correct: low pressure pipes faulty	Replace the low pressure pipes (see Assembly 1060F)
4	HIGH PRESSURE CHECK	All OK	Problems met	Operation
	Check the fuel supply circuit, high pressure side: for example, using the diagnostic equipment (Examiner) to measure the pressure values	Continue to Step 5	Pressure not correct: pressure pump faulty	Replace the pressure pump Op. 1060E10
			Pressure not correct: manifold faulty	Replace the manifold Op. 1060F30
			Pressure not correct: injectors faulty	Replace the injectors Op. 1060F10
			Pressure not correct: high pressure pipes faulty	Replace the high pressure pipes (see Asembly 1060F)
5	CHECK ON CYLINDER COMPRESSION	All OK	Problems met	Operation
	Carry out the cylinder compression test Op. 0510A10	Continue to Step 6	Compression values not correct	Restore the correct cylinder compression, for example, checking the seal of the injectors Op. 1060F10 and the cylinders (see OVERHAULING ENGINE, Subassembly 1004)
6	VALVE CLEARANCE CHECK	All OK	Problems met	Operation
	Check that the valve tappet clearance is correct. Op. 1036H14	Continue to Step 7	Clearance not correct	Restore the correct valve clearance. Op. 1036H18
7	CHECK ON CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis	Fault persists	Search for the fault starting from another symptom'