22 · Diagnostics

Excessive exhaust fumes

Make: Alfa Romeo
Model: 147 Factory Service Manual
Year: 2000–2004
Section: Emissions › Excessive exhaust fumes

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Fault diagnosisExcessive exhaust fumes

EXCESSIVE EXHAUST FUMES

1.9 JTD 8V

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
	Preliminarily check: the engine oil level the condition of the air filter	Continue to Step 1	Oil level too high	Top up the engine oil level
		Continue to Step 1	Filter element dirty or damaged	Replace the filter element Op. 1048A14
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 following the instructions for the diagnostic equipment
		Continue to Step 2	Lack of dialogue with the control unit	Restore the connection between engine management control unit and diagnostic connector See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT
2	CHECKING BLOW-BY CIRCUIT	All OK	Problems met	Operation
	Check the condition of the blow-by gases intake circuit. In particular, check that there are no obstructions in the separator or in the pipes	Continue to Step 3	Fault in the pipe from separator to intake	Restore the correct operation of the circuit: if necessary, replace the pipes
		Continue to Step 3	Fault in separator (rocker cover)	Restore the correct operation of the circuit; if necessary replace the rocker cover
3	CHECKING AIR CIRCUIT	All OK	Problems met	Operation
	Check the condition and the seal of the air supply circuit: in particular, make sure that there is no oil in the pipes	Continue to Step 4	Circuit component damaged	Replace the damaged component
		Continue to Step 4	Oil in air intake pipes	Clean the pipes (check where the oil is coming from)
4	CHECK E.G.R. OPERATION	All OK	Problems met	Operation
	Carry out active diagnosis of the drive solenoid and dismantle the valve assembly to check correct operation	Continue to Step 5	Solenoid valve faulty	Check wiring continuity See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT
			Solenoid valve faulty	Replace the solenoid valve Op. 1080C74
			Fault in valve assembly	Replace the valve assembly Op. 1080C74
5	CHECK ON CYLINDER COMPRESSION	All OK	Problems met	Operation
	Carry out the cylinder compression test	Continue to Step 7	Cylinder compression insufficient	Continue to Step 6
6	CHECK ON CAUSE OF INSUFFICIENT COMPRESSION	All OK	Problems met	Operation
	Carry out R.R. on head to check the valve seal Check the condition of the cylinders/piston rings	Continue to Step 7	Insufficient valve seal	Overhaul the cylinder head Op. 1016E10
		Continue to Step 7	Wear on cylinders/piston rings outside tolerance	Restore the correct clearances
7	CORRECT OPERATION CHECK	All OK	Problems met	Operation
	Check that the fault is no longer present		Fault persists	Search for the fault starting from another symptom'

3.2 V6

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
	Preliminarily check: the engine oil level the condition of the air filter	Continue to Step 1	Oil level too high	Top up the engine oil level
		Continue to Step 1	Filter element dirty or damaged	Replace the filter element Op. 1048A14
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 following the instructions for the diagnostic equipment
		Continue to Step 2	unreliable parameters	Continue following the instructions for the diagnostic equipment
2	CHECKING BLOW-BY CIRCUIT	All OK	Problems met	Operation
	Check the condition of the blow-by gases intake circuit. In particular, check that there are no obstructions in the separator or in the pipes	Continue to Step 3	Fault in the pipe from separator to intake	Restore the correct operation of the circuit: if necessary, replace the pipes
		Continue to Step 3	Fault in separator (rocker cover)	Restore the correct operation of the circuit; if necessary replace the rocker cover
3	CHECKING AIR CIRCUIT	All OK	Problems met	Operation
	Check the condition and the seal of the air supply circuit: in particular, make sure that there is no oil in the pipes	Continue to Step 4	Circuit component damaged	Replace the damaged component
4	CHECK E.G.R. OPERATION	All OK	Problems met	Operation
	Carry out active diagnosis of the drive solenoid and dismantle the valve assembly to check correct operation	Continue to Step 7	Actuator not working	Continue to Step 5
5	EGR ELECTRICAL CIRCUIT CHECK	All OK	Problems met	Operation
	Check continuity/insulation of connections between engine control unit and EGR solenoid See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT	Continue to Step 6	Electrical connection fault	Restore the connections See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT
6	EGR ASSEMBLY OPERATION CHECK	All OK	Problems met	Operation
	Detach actuator from vehicle and dismantle the valve unit to check correct operation.	Continue to Step 9	Valve blocked open	Eliminate the cause of the blockage and replace the actuator if necessary
		Continue to Step 9	Valve free, solenoid defective	Replace actuatorOp. 1080C26
7	CHECK ON CYLINDER COMPRESSION	All OK	Problems met	Operation
	Carry out the cylinder compression test	Continue to Step 9	Cylinder compression insufficient	Continue to Step 8
8	CHECK ON CAUSE OF INSUFFICIENT COMPRESSION	All OK	Problems met	Operation
	Carry out R.R. on head to check the valve seal Check the condition of the cylinders/piston rings	Continue to Step 9	Insufficient valve seal	Overhaul the cylinder head Op. 1016E10
		Continue to Step 9	Wear on cylinders/piston rings outside tolerance	Restore the correct clearances
9	CHECK ON CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis

‹ Prev Black exhaust fumes Next › Excessive fuel consumption

Parts & tools for this job For 2000 Alfa Romeo 147

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