B16 ENGINE STARTS WITH DIFFICULTY' - Alfa - 166 - eLearn

3308586 - B16 ENGINE STARTS WITH DIFFICULTY'

The engine, especially when cold, starts with difficulty only after repeated attempts. When the key is turned, the instruments light up, the starter motor turns, but the engine has trouble starting.

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
	Turn the ignition on and check that the i.e. failure warning light comes on for about 4 seconds and then goes out	Continue to Step 1	The i.e. warning light comes on and remains on	See table K50 I.E. FAILURE WARNING LIGHT ON
		Continue to Step 1	The i.e. failure warning light does not come on	See table K53 I.E. FAILURE WARNING LIGHT OFF
1	CHECKING AIR CIRCUIT	All OK	Problems met	Operation
	Check, in order: the condition of the air filter the condition and seal of the air supply circuit	Continue to Step 2	Filter dirty or partially blocked	Replace air filter Op. 1048A14
		Continue to Step 2	Circuit component damaged	Replace component (See Assembly 1048A)
2	CHECKING WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Connect diagnostic equipment (Examiner or other instruments) to the diagnostic socket. Verify: that there are no faults in the engine management control unit the plausibility of all the parameters	Continue to Step 3	An error is detected in the control unit	Continue following the instructions for the diagnostic equipment
		Continue to Step 3	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 )
3	FUEL FILTER CHECK	All OK	Problems met	Operation
	Check the operation of the fuel filter	Continue to Step 4	Presence of water, petrol, paraffin or dirt detected	Clean tank and pipes and replace filter element Op. 1044B20
4	CHECK ON DIESEL FILTER HEATER	All OK	Problems met	Operation
	Check the operation of the diesel heater on the filter: See Test 1044DA Check fuel heater power supply	Continue to Step 5	Fuel pre-heating not working	Replace the fuel heater Op. 1044D10
5	CHECK RETURN LOW PRESSURE	All OK	Problems met	Operation
	Check the pressure between the twin manifold and the return pipe to the tank: See Test 1060A Check low pressure fuel circuit	Continue to Step 6	Pressure over 1 bar: the return circuit to the tank is clogged	Remove any blockages in the return pipe or the cage for the low pressure pump immersed in the tank
6	CHECK ON DELIVERY LOW PRESSURE	All OK	Problems met	Operation
	Check filter between diesel filter and 'radialjet' high pressure pump See Test 1060B Check low pressure fuel circuit	Continue to Step 7	Leaks in circuit	Eliminate fuel leaks from pipes/low pressure circuit connections
			Pressure under 1.8 bar or difference in pressure between Test B and Test A less than 1 bar	Replace valve on diesel filter mounting Op. 1044B16 Replace the fuel pump Op. 1040A70
			Pressure over 3.5 bar	Replace valve on diesel filter mounting Op. 1044B16
7	INJECTOR LEAK TEST	All OK	Problems met	Operation
	Check whether diesel is leaking from the injectors: See Test 1060C Check high pressure fuel circuit	Continue to Step 8	One or more injectors leaking	Replace injector(s) Op. 1060F10
8	HIGH PRESSURE CHECK	All OK	Problems met	Operation
	Check diesel pressure parameter measured with diagnostic instrument: See Test 1060D Check high pressure fuel circuit	Continue to Step 9	Pressure reading less than 150 bar at over 200 engine rpm	Replace high pressure pump Op. 1060E10
			Pressure reading less than 150 bar at under 200 engine rpm	Replace battery Op. 5530B10 and repeat See Test 1060D Check high pressure fuel circuit
			Leaks in circuit	Eliminate fuel leaks from high pressure circuit pipes/connectors
9	CHECKING VALVE CLEARANCES	All OK	Problems met	Operation
	Check that the valve tappet clearance is correct. Op. 1036H14	Continue to Step 10	Clearance not correct	Restore the correct valve clearance. Op. 1036H18
10	CHECKING CYLINDER COMPRESSION	All OK	Problems met	Operation
	Carry out the cylinder compression test Op. 0510A10	Continue to Step 11	Compression values not correct	Restore the correct cylinder compression, for example checking the seal of the cylinders (see OVERHAULING ENGINE, Subassembly 1004)
11	HECK 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'