X01 EXCESSIVE FUEL CONSUMPTION - Alfa - 166 - eLearn

3308743 - X01 EXCESSIVE FUEL CONSUMPTION

The engine appears to be running smoothly, but the fuel consumption is higher than previously recorded during the life of the vehicle.

The consumption data in the vehicle technical documentation has been defined during the course of homologation tests in accordance with directive 93/116/CE. These tests simulate an urban cycle and an 'average' extra-urban cycle and therefore may not be indicative as consumption depends very much on the style of driving.

1	LEAKS CHECK	All OK	Problems met	Operation
		Results of the tests
	Visually check for fuel leaks from the tank, fuel filler, multi-function valve, etc.	Continue to Step 2	Leaks detected	Eliminate leaks and/or replace faulty components
2	FUEL FILTER CHECK	All OK	Problems met	Operation
	Check the operation of the fuel filter	Continue to Step 3	Presence of water, petrol, paraffin or dirt detected	Clean tank and pipes and replace filter element Op. 1044B20
3	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 Check the fuel supply circuit, low pressure side: if necessary, use the diagnostic equipment (Examiner) to measure the pressure values	Continue to Step 4	Air cleaner dirty or partially blocked	Replace air filter Op. 1048A14
		Continue to Step 4	Circuit component damaged	Replace component (See Assembly 1048A)
4	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 5	An error is detected in the control unit	Continue following the instructions for the diagnostic equipment
		Continue to Step 5	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
5	CHECK EXHAUST PIPE	All OK	Problems met	Operation
	Check for blockages in the exhaust pipe	Continue to Step 6	Exhaust pipe blocked	Replace the component involved
6	CHECKING VALVE CLEARANCES	All OK	Problems met	Operation
	Check that the valve tappet clearance is correct. Op. 1036H14	Continue to Step 7	Clearance not correct	Restore the correct valve clearance. Op. 1036H18
7	CHECKING TIMING	All OK	Problems met	Operation
	Check that the engine timing is correct Op. 0510A20	Continue to Step 8	Timing not correct	Restore the correct engine timing Op. 1032B14
8	CHECKING CYLINDER COMPRESSION	All OK	Problems met	Operation
	Carry out the cylinder compression test Op. 0510A10	Continue to Step 9	Compression values not correct	Restore the correct cylinder compression, for example, by checking the seal of the injectors Op. 1056B70 and cylinders (see OVERHAULING ENGINE, Subassembly 1004)
9	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'