Engine not running smoothly / (losing power)

Make: Fiat
Model: Grande Punto Factory Service Manual
Year: 2005–2012
Section: Engine › Engine not running smoothly / (losing power)

‹ Prev Engine not running smoothly / (hesistant)Next › Engine not running smoothly / (irregular operation)

Fault diagnosisEngine not running smoothly / (losing power)

ENGINE NOT RUNNING SMOOTHLY / (LOSING POWER)

1.2 8v, 1.4 8v

Prolonged performance reductions occur under constant load and speed conditions.

0	PRELIMINARY CHECKS	All OK	Problems encountered	Operation
		Test results
	First, check: status of spark plugs and leads; condition of the air filter; the condition of the air intake circuit; no obstructions at the catalyzer	Move on to Step 1	Spark plugs dirty or damaged	Replace the spark plugs Op. 5510D10 SPARK PLUGS - R+R
			Spark plug leads damaged	Replace spark plug leads
			Air intake circuit faulty	Eliminate the fault
			Catalytic converter obstructed	Replace the exhaust manifold Op. 1072C16 EXHAUST MANIFOLD WITH CATALYTIC CONVERTER - R.R.
1	CHECK USING DIAGNOSTIC EQUIPMENT	All OK	Problems encountered	Operation
	Connect the Examiner diagnostic equipment to the diagnostic socket. Check: that there are no faults in the engine management control unit; parameter plausibility	Move on to Step 2	Error detected in the control unit	Continue following the instructions for the diagnostic equipment
		Move on to Step 2	Parameter not consistent	Continue following the instructions for the diagnostic equipment
2	ROAD TEST USING DIAGNOSTIC EQUIPMENT	All OK	Problems encountered	Operation
	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 3	The sudden onset of errors in the control unit is detected	Continue following the instructions for the diagnostic equipment
		Move on to Step 3	Parameters not consistent	Continue following the instructions for the diagnostic equipment
3	FUEL PRESSURE ROAD TEST	All OK	Problems encountered	Operation
	Carry out a road test and check the fuel supply pressure Op. 0510C10 FUEL SYSTEM - CHECK DELIVERY PRESSURE under the conditions in which the fault occurs	Move on to Step 4	Fuel pressure too low: pipes obstructed	Eliminate the constrictions
			Fuel pressure too low: valve obstructed	Replace the fuel cap Op. 1040A40 PLUG FOR FUEL FILLER PIPE - R + R
			Fuel pressure too low: regulator blocked	Replace the petrol pump Op. 1040A70 SUBMERGED PUMP ASSEMBLY COMPLETE WITH LEVEL GAUGE CONTROL - R + R
			Fuel pressure too low: pump defective	Replace the petrol pump Op. 1040A70 SUBMERGED PUMP ASSEMBLY COMPLETE WITH LEVEL GAUGE CONTROL - R + R
			Fuel pressure too low: filter blocked	Replace the petrol pump Op. 1040A70 SUBMERGED PUMP ASSEMBLY COMPLETE WITH LEVEL GAUGE CONTROL - R + R
4	CHECK ON CORRECT OPERATION	All OK	Problems encountered	Operation
	Check that the fault is no longer present		The fault persists: control unit defective	Replace the control unit Op. 1056B82 INJECTION/IGNITION SYSTEM E.C.U. (ONE) - R + R

‹ Prev Engine not running smoothly / (hesistant)Next › Engine not running smoothly / (irregular operation)

Parts & tools for this job For 2005 Fiat Grande Punto

Links open Amazon search results in a new tab. As an Amazon Associate I earn from qualifying purchases.