Engine does not produce best performance

Make: Fiat
Model: Multipla Factory Service Manual
Year: 1998–2010
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

1.6 16v

The engine runs smoothly at medium-low speeds, but does not reach iits usual maximum performance (both in terms of speed and acceleration)

1.6 16v · BIPOWER

The engine runs smoothly at medium-low speeds, but does not produce its normal maximum performance (both in terms of speed and acceleration)

NOTE: After system components have been replaced the self-adjustment parameters must be zeroed in order to restore the values originally set in the factory to the control unit maps

1.6 16v

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
1	CHECKING WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
2	CHECK ON FUEL PRESSURE	All OK	Problems met	Operation
3	CHECK ON TIMING	All OK	Problems met	Operation
4	CHECK KNOCK SENSOR	All OK	Problems met	Operation
9	CHECK ON CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis	Fault persists

1.9 JTD 8V

The engine runs smoothly at medium-low speeds, but does not reach iits usual maximum performance (both in terms of speed and acceleration)

1.6 16v · BIPOWER

0	PRELIMINARY CHECKS	All OK	Problems encountered	Operation
		Results of the tests
1	CHECK USING DIAGNOSTIC EQUIPMENT	All OK	Problems encountered	Operation
	Connect the diagnostic test equipment (Examiner or other instruments) to the tester input. Check the following at the METHANE engine management control unit, in the errors ambient that there are no faults in the methane management control unit	Move on to Step 2 1	Error detected in the control unit	Continue following the instructions for the diagnostic equipment
2	CHECK ACCELERATOR	All OK	Problems encountered	Operation
	Check that the accelerator cable is working properly: in particular check cable condition; cable slides properly in sheath sheath correctly fastened	Move on to Step 3 1	Accelerator cable fault	Repair accelerator cable
3	CHECK METHANE PRESSURE	All OK	Problems encountered	Operation
4	CHECK HIGH PRESSURE CIRCUIT SEAL	All OK	Problems encountered	Operation
5	INJECTOR SEAL CHECK	All OK	Problems encountered	Operation
6	TIMING CHECK	All OK	Problems encountered	Operation
7	CYLINDER COMPRESSION CHECK	All OK	Problems encountered	Operation
8	CHECK CAUSE OF INSUFFICIENT CYLINDER COMPRESSION	All OK	Problems encountered	Operation

1.9 JTD 8V

1	CHECK WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
		Results of the tests
2	CHECK ON FUEL FILTER	All OK	Problems met	Operation
3	CHECKING AIR CIRCUIT	All OK	Problems met	Operation
4	CHECK ON BRAKE PEDAL SWITCH	All OK	Problems met	Operation
5	CHECK ON TURBOCHARGER	All OK	Problems met	Operation
	Check the operation of the turbocharger check the condition of the impeller shaft end float check the supercharging pressure	Continue to Step 6	Turbocharger faulty	Replace turbocharger Op. 1064A10
6	CHECK ON RETURN LOW PRESSURE	All OK	Problems met	Operation
7	LOW SUPPLY PRESSUR CHECK	All OK	Problems met	Operation
8	INJECTOR LEAKAGETEST	All OK	Problems met	Operation
9	HIGH PRESSURE CHECK	All OK	Problems met	Operation
10	EXHAUST PIPE CHECK	All OK	Problems met	Operation

1.6 16v · GPOWER

The engine runs smoothly at medium-low speeds, but does not reach iits usual maximum performance (both in terms of speed and acceleration)

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
	Preliminarily check: The state of the spark plugs and leads The condition of the air intake circuit For a possible obstruction of the catalyzer and other exhaust pipes For any obstacles to the complete accelerator pedal travel	Continue to Step 1	Spark plugs worn	Replace the spark plugs
			Spark plug leads worn or damaged	Replace the spark plug leads Op. 5510D14
			Air intake circuit fault	Eliminate the problem, if necessary replacing the filter element Op. 1048A14
			Catalyzer/exhaust pipes obstructed	Restore the operation of the exhaust pipe
			Accelerator cable faulty	Restore the operation of the accelerator cable
1	CHECKING WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Connect the Examiner diagnostic equipment to the diagnostic connector and check the following at the LPG engine management control unit: in errors ambient that there are no faults in the LPG engine management control unit In parameters ambient 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 control unit and the diagnostic connector
2	ACCELERATOR CHECK	All OK	Problems met	Operation
	Check that the accelerator cable is working properly in particular, check: Condition of the cable Correct sliding of the cable in the sheath Correct fastening of the sheath	Continue to Step 3	Accelerator cable faulty	Renew the accelerator cable
3	LPG PRESSURE CHECK	All OK	Problems met	Operation
	Using the Examiner diagnostic equipment connected to the diagnostic connector, check the following at the LPG engine management control unit: in parameters ambient that the LPG pressure is correct by carrying out See Test 1057BA LPG pressure check	Continue to Step 4	Pressure not correct LPG injectors defective	Replace the LPG injectors
			Pressure not correct LPG pressure regulator not correctly adjusted	Replace the LPG pressure regulator Op. 1043B42
			Pressure not correct LPG pressure sensor defective	Replace the LPG pressure regulator Op. 1043B42
			Pressure not correct LPG system leaking	Eliminate the leaks
			Pressure not correct LPG pump defective	Replace the LPG pump Op. 1043A57
			Pressure not correct LPG pump control unit defective	Replace the LPG pump management control unit Op. 1043A54
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 engine timing
5	CHECK ON CYLINDER COMPRESSION	All OK	Problems met	Operation
	Carry out the cylinder compression test Op. 0510A10	Continue to Step 7		Continue to Step 6
6	CHECK ON CAUSE OF INSUFFICIENT CYLINDER 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

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Parts & tools for this job For 1998 Fiat Multipla

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