Engine not running smoothly (not firing properly)

Make: Lancia
Model: Thesis Factory Service Manual
Year: 2002–2009
Section: Engine › Engine not running smoothly (not firing properly)

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Fault diagnosisEngine not running smoothly (not firing properly)

ENGINE NOT RUNNING SMOOTHLY (NOT FIRING PROPERLY)

2.4 JTD 10V

Prolonged performance reductions occur under constant load and speed conditions.

STEP	OPERATIONS TO BE CARRIED OUT	TEST RESULTS
0	PRELIMINARY CHECKS	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the following, in order: no leaks in fuel circuit; condition of the air intake circuit; no obstructions in the catalytic converter; no water in the diesel filter	Move on to Step	1. Leaks in fuel circuit	1. Remove water from diesel fuel
			2. Fault in the air intake circuit	2. Renew the air intake circuit
			3. Obstruction in the catalytic converter	3. Replace the catalytic converter
			4. Water in diesel filter	4. Clean the tank and replace the filter
1	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Connect the diagnostic equipment (Examiner or other instruments) to the diagnostic socket.Check: that there are no errors in the control unit; parameter plausibility	Move on to Step	1. Error detected in the control unit	1. Continue following the instructions for the diagnostic equipment
		Move on to Step	2. Parameters not plausible	2. Continue following the instructions for the diagnostic equipment
2	ROAD TEST USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Carry out a road test keeping the diagnostic equipment connected. Make sure that the conditions in which the problem occurs are reproduced Check: that there are no errors in the control unit; parameter plausibility	Move on to Step	1. The sudden onset of errors in the control unit is detected	1. Continue following the instructions for the diagnostic equipment
		Move on to Step	2. Parameters off the scale	2. Continue following the instructions for the diagnostic equipment
3	BRAKE PEDAL SWITCH CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the pedal switch is working properly (Wiring Diagram ) E5050 DIESEL ENGINE ELECTRONIC MANAGEMENT	Move on to Step	1. Brake pedal does not return	1. Eliminate the cause of the sticking
			2. Switch operation faulty	2. Replace the switch
			3. Wiring short circuited (intermittent)	3. Eliminate the cause of the problem (Wiring Diagram ) E5050 DIESEL ENGINE ELECTRONIC MANAGEMENT
4	CHECK ON CORRECT OPERATION	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the fault is no longer present

2.0 TB, 2.4 20V, 3.0 V6

Prolonged performance reductions occur under constant load and speed conditions.

STEP	OPERATIONS TO BE CARRIED OUT	TEST RESULTS
0	PRELIMINARY CHECKS	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	First, check: condition of the air filter; the condition of the air intake circuit;	Move on to Step	1. Filter blocked	1. Replace the filter element See in Op. 1048A14 air cleaner filtering element - replace.
		Move on to Step	2. Air intake circuit faulty	2. Eliminate the fault
1	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Connect the diagnostic test equipment (Examiner or other instruments) to the tester input.Check: that there are no faults in the engine management control unit; parameter plausibility	Move on to Step	1. "Fuel system" error detected	1. Continue following the instructions in Table Z050
			2. "Misfire" error detected	2. Continue following the instructions in Table Z053
			3. Another error detected in the control unit	3. Continue following the instructions for the diagnostic equipment
			4. Parameter not consistent	4. Continue following the instructions for the diagnostic equipment
2	ROAD TEST USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Carry out a road test reproducing the conditions in which the fault occurs, keeping the diagnostic equipment connected.Check: that there are no faults in the engine management control unit; parameter plausibility	Move on to Step	1. "Fuel system" error detected	1. Continue following the instructions in Table Z050
			2. "Misfire" error detected	2. Continue following the instructions in Table Z053
			3. The sudden onset of another error is detected	3. Continue following the instructions for the diagnostic equipment
			4. Parameters not consistent	4. Continue following the instructions for the diagnostic equipment
3	FUEL PRESSURE ROAD TEST	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Carry out a road test and check the fuel supply pressure < R1 > in the conditions in which the problem occurs See in Op. 0510C10 FUEL SYSTEM - Check DELIVERY PRESSURE	Move on to Step	1. Fuel pressure too low: pipes obstructed	1. Eliminate the constrictions, replace the pipes if necessary
		Move on to Step	2. Fuel pressure too low: pump defective	2. Replace the fuel pump assembly See in Op. 1040A70 SUBMERGED PUMP ASSEMBLY complete with level gauge - R.R.
4	CHECK ON CORRECT OPERATION	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the fault is no longer present		Fault persists control unit defective	Replace the control unit See in Op. 1056B82 Injection/ignition system CONTROL UNIT (one) - R.R.

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Parts & tools for this job For 2002 Lancia Thesis

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