Engine does not produce best performance

Make: Lancia
Model: Ypsilon Factory Service Manual
Year: 2003–2011
Section: Engine › Engine does not produce best performance

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Fault diagnosisEngine does not produce best performance

ENGINE DOES NOT PRODUCE BEST PERFORMANCE

1.2 8v

Under all conditions

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
	Preliminarily check: the state of the spark plugs and leads; full accelerator pedal travel the condition of air filter the condition of the air intake circuit; absence of obstructions in the catalytic converter	Continue to Step 1	Spark plugs dirty or damaged	Replace the spark plugs Op. 5510D10
			Cables damaged	Replace spark plug leads Op. 5510D14
			Insufficient accelerator pedal travel	Restore pedal travel
			Air intake circuit fault	Eliminate the problem
			Catalyzer obstructed	Replace the exhaust manifold Op. 1072C16
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; parameter plausibiilty	Continue to Step 2	'Supply system' error detected	See table Z50
			Another error dectected in the control unit	Continue following the instructions for the diagnostic equipment.
			Inconsistent parameter	Continue following the instructions for the diagnostic equipment.
2	ROAD TEST WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Road test the vehicle, reproducing the conditions in which the fault arises, keeping the diagnostic equipment connected. Check: that there are no faults in the engine management control unit; parameter plausibiilty	Continue to Step 3	'Supply system' error detected	See table Z50
			Sudden occurrence of another error detected	Continue following the instructions for the diagnostic equipment.
			Parameters inconsistent	Continue following the instructions for the diagnostic equipment.
3	FUEL PRESSURE ROAD TEST	All OK	Problems met	Operation
	Road test the vehicle and check the fuel supply pressure Op. 0510C10in the conditions that lead to the anomaly	Continue to Step 4	Insufficient fuel pressure: pipes obstructed	Remove restrictions
			Insufficient fuel pressure: valve obstructed	Replace the tank cap
			Insufficient fuel pressure: regulator out of calibration	Replace the pump assembly
			Low fuel pressure: defective pump	Replace the pump assembly
			Low fuel pressure: clogged filter	Replace the pump assembly
4	CHECK ON TIMING	All OK	Problems met	Operation
	Check that the timing is correct	Continue to Step 5	Timing not correct	Restore the correct timing
5	CHECK ON CYLINDER COMPRESSION	All OK	Problems met	Operation
	Carry out the cylinder compression test Op. 0510A10	Continue to Step 8	Cylinder compression insufficient	Continue to Step 6
6	CHECKING VALVE CLEARANCE	All OK	Problems met	Operation
	Check the valve tappet clearance	Continue to Step 7	Clearance not correct	Restore correct clearance
7	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 8	Insufficient valve seal	Overhaul the cylinder head
		Continue to Step 8	Cylinders/piston rings worn	Repair the leak
8	CHECK ON CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis	Fault persists: control unit faulty	Replace control unit ( Op. 1056B82)

1.2 16v

Under all conditions

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
	Preliminarily check: the state of the spark plugs and leads; full accelerator pedal travel the condition of air filter the condition of the air intake circuit; absence of obstructions in the catalytic converter	Continue to Step 1	Spark plugs dirty or damaged	Replace the spark plugs Op. 5510D10
			Cables damaged	Replace spark plug leads Op. 5510D14
			Insufficient accelerator pedal travel	Restore pedal travel
			Air intake circuit fault	Eliminate the problem
			Catalyzer obstructed	Replace the exhaust manifold Op. 1072C16
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; parameter plausibiilty	Continue to Step 2	'Supply system' error detected	See table Z50
			Another error dectected in the control unit	Continue following the instructions for the diagnostic equipment.
			Inconsistent parameter	Continue following the instructions for the diagnostic equipment.
2	ROAD TEST WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Road test the vehicle, reproducing the conditions in which the fault arises, keeping the diagnostic equipment connected. Check: that there are no faults in the engine management control unit; parameter plausibiilty	Continue to Step 3	'Supply system' error detected	See table Z50
			Sudden occurrence of another error detected	Continue following the instructions for the diagnostic equipment.
			Parameters inconsistent	Continue following the instructions for the diagnostic equipment.
3	FUEL PRESSURE ROAD TEST	All OK	Problems met	Operation
	Road test the vehicle and check the fuel supply pressure Op. 0510C10in the conditions that lead to the anomaly	Continue to Step 4	Insufficient fuel pressure: pipes obstructed	Remove restrictions
			Insufficient fuel pressure: valve obstructed	Replace the tank cap
			Insufficient fuel pressure: regulator out of calibration	Replace the pump assembly
			Low fuel pressure: defective pump	Replace the pump assembly
			Low fuel pressure: clogged filter	Replace the pump assembly
4	CHECK ON TIMING	All OK	Problems met	Operation
	Check that the timing is correct	Continue to Step 5	Timing not correct	Restore the correct timing
5	CHECK ON CYLINDER COMPRESSION	All OK	Problems met	Operation
	Carry out the cylinder compression test Op. 0510A10	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
		Continue to Step 7	Cylinders/piston rings worn	Repair the leak
7	CHECK ON CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis	Fault persists: control unit faulty	Replace control unit ( Op. 1056B82)

1.4 16v

Under all conditions

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
	Preliminarily check: the state of the spark plugs and leads; full accelerator pedal travel the condition of air filter the condition of the air intake circuit; absence of obstructions in the catalytic converter	Continue to Step 1	Spark plugs dirty or damaged	Replace the spark plugs Op. 5510D10
			Cables damaged	Replace spark plug leads Op. 5510D14
			Insufficient accelerator pedal travel	Restore pedal travel
			Air intake circuit fault	Eliminate the problem
			Catalyzer obstructed	Replace the exhaust manifold Op. 1072C16
1	CHECKING WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Connect the Examiner diagnostic equipment to the diagnostic socket. Check: that there are no faults in the engine management control unit; plausibility of all the parameters	Continue to Step 2	'Supply system' error detected	See table Z50
			Another error dectected in the control unit	Continue following the instructions for the diagnostic equipment
			Inconsistent parameter	Continue following the instructions for the diagnostic equipment
2	CHECKING WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Road test the vehicle, reproducing the conditions in which the fault arises, keeping the diagnostic equipment connected. Check: that there are no faults in the engine management control unit; plausibility of all the parameters	Continue to Step 3	'Supply system' error detected	See table Z50
			Sudden occurrence of another error detected	Continue following the instructions for the diagnostic equipment
			Parameters inconsistent	Continue following the instructions for the diagnostic equipment
3	FUEL PRESSURE ROAD TEST	All OK	Problems met	Operation
	Road test the vehicle and check the fuel supply pressure Op. 0510C10in the conditions that lead to the anomaly	Continue to Step 4	Insufficient fuel pressure: pipes obstructed	Remove restrictions
			Insufficient fuel pressure: valve obstructed	Replace the tank cap
			Insufficient fuel pressure: regulator out of calibration	Replace the pump assembly
			Low fuel pressure: defective pump	Replace the pump assembly
			Low fuel pressure: clogged filter	Replace the pump assembly
4	CHECK ON TIMING	All OK	Problems met	Operation
	Check that the timing is correct	Continue to Step 5	Timing not correct	Restore the correct timing
5	CHECK ON CYLINDER COMPRESSION	All OK	Problems met	Operation
	Carry out the cylinder compression test Op. 0510A10	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
		Continue to Step 7	Cylinders/piston rings worn	Repair the leak
7	CHECK ON CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis	Fault persists: control unit faulty	Replace control unit Op. 1056B82

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