22 · Diagnostics

Excessive oil consumption

Make: Fiat
Model: Idea Factory Service Manual
Year: 2003–2012
Section: Consumption /leaks/ wear › Excessive oil consumption

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Fault diagnosisExcessive oil consumption

EXCESSIVE OIL CONSUMPTION

The engine is running smoothly, but the oil consumption is higher than previously recorded during the life of the vehicle.

High consumption during the first few thousand kilometres is considered normal.

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
	Check: that the level of the engine oil is not high that there are no local leaks that there is no engine oil in the coolant that the end of the exhaust pipe is not dirty with oil that there are no blueish exhaust fumes	Continue to Step 1	Fluid level not correct	Restore the correct level
			Localised engine oil leaks	Eliminate localised leak
			Oil in the cooling circuit	Continue to Step 1
			Exhaust tail pipe dirty with oil	Continue to Step 2
			that there are no blue exhaust fumes	Continue to Step 2
1	CHECKING CYLINDER HEAD	All OK	Problems met	Operation
	Remove the cylinder head. That that the following are absent: Wear on valve stem with excessive clearance between the valve stem and valve guide and between the valve stem and oil seals oily deposits on the valves; defects in the cylinder block/crankcase surface; defects in the cylinder head gasket;	Continue to Step 2	Excessive clearance between the valve stem and valve guide and between the valve stem and oil seal	Replace the damaged/worn components
			Presence of oily dross on the valves	Overhaul the cylinder head
			Cylinder block/crankcase plane defective	Reface the cylinder block/crankcase
			Cylinder head gasket fault	Check planarity of Cylinder head/Crankcase mating surfaces and replace the cylinder head gasket
2	ENGINE OIL PENETRATION CHECK	All OK	Problems met	Operation
	Check the piston seals, in particular: that they are not broken or damaged that the actual rings are correctly fitted that there is no seizing or sticking in the grooves	Continue to Step 3	Piston seals damaged or seized	Replace pistons, pins and seals
		Continue to Step 3	Piston seals not correctly fitted	Fit the seals correctly
3	CYLINDER LINER/BORE CHECK	All OK	Problems met	Operation
	Check the cylinder liners/bores. In particular: absence of scoring/vitrification Linear dimensions, particularly the lack of ovality/taper/wear Correct piston - liner installation clearance	Continue to Step 4	Liners with scoring and/or vitrification	Grind the cylinder liners/bores
			Dimensions out of tolerance: presence of ovality/taper/wear	Grind the cylinder liners/bores
			Fitting clearance incorrect	Replace the pistons, pins and seals, respecting the fitting clearances
4	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 2003 Fiat Idea

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