D03 ENGINE NOT RUNNING SMOOTHLY / (IRREGULAR OPERATION) - Alfa - 156 - eLearn

3233016 - D03 ENGINE NOT RUNNING SMOOTHLY / (IRREGULAR OPERATION)

The engine does not run smoothly in all conditions (load, speed, etc.).In particular, there are brief, but intense 'flat spots'

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
	Preliminarily check: condition of air filter correct fixing of battery earth	Continue to Step 1	Filter element dirty or damaged	Replace the filter element Op. 1048A14
		Continue to Step 1	Battery earth lead not correctly fixed	Restore correct fixing Op. 5530B22
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 E5030 PETROL ENGINE ELECTRONIC MANAGEMENT ).
2	ACCELERATOR CHECK	All OK	Problems met	Operation
1.6 TS 1.8 TS [d]	Check the accelerator cable. In particular, check the: condition of the cable correct sliding of the cable in the sheath correct fixing of the sheath	Continue to Step 3	Accelerator cable faulty	Renew the accelerator cable Op. 1068A30
2.5 V6	Check that the accelerator pedal potentiometer is correctly calibrated	Continue to Step 3	Potentiometer setting incorrect	Restore the operation of the potentiometer
3	CHECK ON INJECTORS	All OK	Problems met	Operation
	Using the diagnostic equipment (Examiner or other instruments) carry out the active diagnosis of the injectors	Continue to Step 4	Injector connections faulty	Restore the connection of the injectors with the control unit, ( See E5030 PETROL ENGINE ELECTRONIC MANAGEMENT )
		Continue to Step 4	Injectors faulty	Replace the injectors Op. 1056B70
4	CHECK ON FUEL PRESSURE	All OK	Problems met	Operation
	Check the fuel supply pressure Op. 0510C10	Continue to Step 5	Pressure not correct	Replace the fuel pump assembly Op. 1056B70
5	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'