Engine starts with difficulty''
- Make
- Alfa Romeo
- Model
- GT Factory Service Manual
- Year
- 2003–2010
- Section
- Starting › Engine starts with difficulty''
ENGINE STARTS WITH DIFFICULTY''
The engine, particularly when cold, starts with difficulty and only after repeated attempts. When the key is turned the instruments light up as normal, the starter motor turns, but the engine is difficult to start.
| Results of the tests | ||||
| 0 | PRELIMINARY CHECKS | All OK | Problems encountered | Operation |
|---|---|---|---|---|
First, check:
| Move on to Step 1 | Spark plugs worn | Replace the spark plugs [ Op. | |
| Leads damaged | Replace the leads | |||
| Air intake circuit component damaged | Repair or replace the damaged component | |||
| Exhaust blocked | Repair or replace the damaged component | |||
| Air filter blocked | Replace the filter element | |||
| 1 | INTAKE AND EXHAUST SYSTEM LEAKAGE TEST | All OK | Problems encountered | Operation |
Check the intake and exhaust system for leaks by carrying out Test 1072OA | Move on to Step 2 | Air leaks to the intake circuit | Restore seal | |
| 2 | CHECK USING DIAGNOSTIC EQUIPMENT | All OK | Problems encountered | Operation |
Connect the diagnostic equipment (Examiner or other instruments) to the diagnostic socket. Check
| Move on to Step 3 | Error detected in the control unit | Continue following the instructions for the diagnostic equipment | |
| Parameters not plausible | Continue following the instructions for the diagnostic equipment | |||
| 3 | PETROL VAPOUR RECOVERY SYSTEM CHECK | All OK | Problems encountered | Operation |
| Check that the petrol vapour recovery system is working properly | Move on to Step 4 | Air leaks | Restore the correct seal | |
| Engine oil vapour intake pipe broken | Replace the pipe Op. 1080D14 PIPE FROM ENGINE OIL VAPOUR SEPARATOR TO INTAKE - R + R | |||
| Pipe from filter to intermediate coupling broken | Replace the pipe Op. 1080E61 FUEL VAPOUR PIPE FROM VAPOUR FILTER TO INTERMEDIATE COUPLING - R.R. | |||
| Pipe from intermediate coupling to solenoid valve broken | Replace the pipe Op. 1080E63 FUEL VAPOR HOSE BETWEEN RIGID PIPE AND CUT OFF SOLENOID R R | |||
| 4 | SUPPLY PRESSURE CHECK | All OK | Problems encountered | Operation |
Check that the fuel supply pressure is correct by carrying out Test 1056BY | Move on to Step 5 | Fuel pressure too low: pipe obstructed | Eliminate the obstructions, if necessary, replace the pipe Op. 1040B30 TUBAZIONE DI MANDATA COMBUSTIBILE (UNICA) - S.R. | |
| Fuel pressure too low: pump faulty | Replace the fuel pump assembly Op. 1040A70 SUBMERGED PUMP ASSEMBLY COMPLETE WITH LEVEL GUAGE CONTROL - R + R | |||
| 5 | INJECTOR SEAL CHECK | All OK | Problems encountered | Operation |
Check correct injector seal by carrying out Test 1056BZ | Move on to Step 6 | Injectors defective | Replace the injectors | |
| 6 | TIMING CHECK | All OK | Problems encountered | Operation |
| Check that the valve gear timing is correct | Move on to Step 7 | Valve gear timing not correct | Op. 1032B10 TOOTHED TIMING BELT - R + R FOR TIMING ADJUSTMENT OR REPLACEMENT | |
| 7 | CYLINDER COMPRESSION CHECK | All OK | Problems encountered | Operation |
Carry out the cylinder compression check Op. 0510A10 CYLINDER COMPRESSION - CHECK FOR LOOSE SPARK PLUGS OR INJECTORS | Move on to Step 8 | Cylinder compression insufficient | Move on to Step 6 | |
| 8 | CHECK ON CAUSE OF INSUFFICIENT COMPRESSION | All OK | Problems encountered | Operation |
| Move on to Step 9 | Valve seal insufficient | Overhaul the head | |
| Cylinders/piston rings worn | Restore the seal | |||
| 9 | CHECK ON CORRECT OPERATION | All OK | Problems encountered | Operation |
| Check that the fault is no longer present | End of diagnosis | Fault persists: control unit defective | Replace the control unit Op. 1056B82 CENTRALINA (UNICA) DELL''IMPIANTO INIEZIONE/ACCENSIONE - S.R. | |
| Results of the tests | ||||
| 0 | PRELIMINARY CHECKS | All OK | Problems encountered | Operation |
|---|---|---|---|---|
Check the following, in order:
| Move on to Step 1 1 | air intake circuit component | Repair or replace the damaged component | |
| Filter blocked | replace the air filter Op. | |||
| Leaks from the diesel pipes | Adjust pipe tightness to correct setting and replace if necessary. | |||
| Water, petrol, paraffin or dirt found to be present | Clean the tank and pipes and replace the diesel filter cartridge Op. | |||
| obstruction in the exhaust system | Replace the damaged system component | |||
| 1 | CHECK USING DIAGNOSTIC EQUIPMENT | All OK | Problems encountered | Operation |
Connect the diagnostic equipment (Examiner or other instruments) to the diagnostic socket. Check:
| Move on to Step 2 1 | Error detected in the control unit | Continue following the instructions for the diagnostic equipment | |
| Parameters not plausible | Continue following the instructions for the diagnostic equipment | |||
| 2 | HIGH PRESSURE CHECK | All OK | Problems encountered | Operation |
With the diagnostic equipment connected to the diagnostic socket. Check as described in the Test See Test 1060D ELECTRONIC DIESEL INJECTION CONTROL that the diesel pressure parameter is correct | Move on to Step 10 1 | Pressure not correct | Move on to Step 3 1 | |
| 3 | LOW RETURN PRESSURE CHECK | All OK | Problems encountered | Operation |
Check as described in the Test See Test 1060A LOW RETURN FUEL PRESSURE CIRCUIT CHECK that the pressure in the return pipe to the tank is less than 1 bar | Move on to Step 4 1 | Pressure above the maximum limit: return pipe to the tank obstructed | Repair the pipe, if necessary, replace it | |
| 4 | LOW SUPPLY PRESSURE CHECK | All OK | Problems encountered | Operation |
Check as described in the Test See Test 1060B LOW FUEL PRESSURE SUPPLY CIRCUIT CHECK check that the diesel pressure between the filter and the pressure pump is between 2 and 3 bar | Move on to Step 10 1 | Pressure below the minimum limit or above the maximum limit | Move on to Step 5 1 | |
| 5 | LOW SUPPLY PRESSURE CHECK | All OK | Problems encountered | Operation |
Clse the return pipe downstream of the low pressure regulator valve, in the fuel filter cover, using the special tool, and carry out the Test again See Test 1060B LOW FUEL PRESSURE SUPPLY CIRCUIT CHECK with the pipe closed, checking that the filter outlet pressure remains below 2 bar | Move on to Step 6 1 | Pressure rises to 5 bar: pressure regulator valve on filter mounting incorrectly adjusted | Replace the diesel filter cover | |
| 6 | LOW SUPPLY PRESSURE CHECK | All OK | Problems encountered | Operation |
| Check that the difference in pressure upstream and downstream of the filter is less than 1 bar | Move on to Step 7 1 | Difference in pressure more than 1 bar | Replace the diesel filter cartridge Op. | |
| 7 | LOW SUPPLY PRESSURE CHECK | All OK | Problems encountered | Operation |
| Check that the supply pump pressure at the filter inlet is more than 2.2 bar | Move on to Step 10 1 | Pressure below 2 bar | Move on to Step 8 1 | |
| 8 | LOW SUPPLY PRESSURE CHECK | All OK | Problems encountered | Operation |
| Measure the difference in pressure between the electrical pump outlet and the filter inlet checking that it is less than 0.3 bar | Move on to Step 9 1 | Difference in pressure more than 0.3 bar | Replace the pipe | |
| 9 | LOW SUPPLY PRESSURE CHECK | All OK | Problems encountered | Operation |
| Check, as described in, that the pump supply voltage is equal to 12 volt and that the current absorbed is between 2 and 10 Ampere | Move on to Step 10 1 | Voltage < 12 volt | Check electrical wiring See | |
| Current > 10 Amps: pump defective | Replace the fuel pump assembly Op. Op. 1040A70 SUBMERGED PUMP ASSEMBLY COMPLETE WITH LEVEL GUAGE CONTROL - R + R | |||
| Current < 2 Amps: pump obstructed | Replace the fuel pump assembly Op. Op. 1040A70 SUBMERGED PUMP ASSEMBLY COMPLETE WITH LEVEL GUAGE CONTROL - R + R and clean the fuel tank | |||
| 10 | CHECK CORRECT OPERATION | All OK | Problems encountered | Operation |
| Replace the DRV high pressure regulator and check that the fault is no longer present | End of diagnosis | Fault persists | Move on to Step 11 1 | |
| 11 | CHECK CORRECT OPERATION | All OK | Problems encountered | Operation |
| Replace the high pressure pump and check that the fault is no longer present | End of diagnosis | Fault persists | Move on to Step 12 1 | |
| 12 | CYLINDER COMPRESSION CHECK | All OK | Problems encountered | Operation |
| Carry out the cylinder compression check | Move on to Step 14 1 | Cylinder compression insufficient | Move on to Step 13 1 | |
| 13 | CHECK ON CAUSE OF INSUFFICIENT COMPRESSION | All OK | Problems encountered | Operation |
- R/R head [PR_1016C10] for valve leakage test
| Move on to Step 14 1 | Valve seal insufficient | Overhaul the cylinder head Op. | |
| Cylinders/piston rings worn | Restore the seal | |||
| 14 | CHECK ON CORRECT OPERATION | All OK | Problems encountered | Operation |
| Check that the fault is no longer present | End of diagnosis | Fault persists: control unit defective | Replace the engine management control unit Op. | |
The engine, particularly when cold, starts with difficulty and only after repeated attempts. When the key is turned the instruments light up as normal, the starter motor turns, but the engine is difficult to start.
| Results of the tests | ||||
| 0 | PRELIMINARY CHECKS | All OK | Problems encountered | Operation |
|---|---|---|---|---|
First, check:
The condition of the air intake circuit Remove the spark plugs and check their state and that the electrode gap is correct | Move on to Step 1 1 | Air intake circuit component damaged | Repair or replace the damaged component | |
| Air filter blocked | Replace the filter Op. | |||
| Spark plugs damaged | Replace the spark plugs Op. | |||
| Spark plugs wet | Dry the spark plugs Move on to Step 1 1 | |||
| 1 | CHECK USING DIAGNOSTIC EQUIPMENT | All OK | Problems encountered | Operation |
Connect the diagnostic equipment (Examiner or other instruments) to the diagnostic socket. Check:
| Move on to Step 2 1 | Error detected in the control unit | Proceed as instructed by the diagnostic tester | |
| Parameters not plausible | Proceed as instructed by the diagnostic tester | |||
| Pressure measured differs greatly from setting | Proceed with checking the low pressure circuit, high pressure pump, pressure regulator, wiring, control unit | |||
| 2 | LOW SUPPLY PRESSURE CIRCUIT CHECK | All OK | Problems encountered | Operation |
Check that the fuel pressure is correct Op. | Move on to Step 3 1 | Fuel pressure too low: supply pipe obstructed | Eliminate the obstructions, if necessary, replace the pipe | |
| Fuel pressure too low: pump defective | Replace the pump assembly Op. Op. 1040A70 SUBMERGED PUMP ASSEMBLY COMPLETE WITH LEVEL GUAGE CONTROL - R + R | |||
| 3 | TIMING CHECK | All OK | Problems encountered | Operation |
Check that the valve gear timing is correct Op. | Move on to Step 4 1 | Valve gear timing not correct | Restore the correct valve gear timing Op. Op. 1032B10 TOOTHED TIMING BELT - R + R FOR TIMING ADJUSTMENT OR REPLACEMENT | |
| 4 | CYLINDER COMPRESSION CHECK | All OK | Problems encountered | Operation |
Carry out the cylinder compression check Op. Op. 0510A10 CYLINDER COMPRESSION - CHECK FOR LOOSE SPARK PLUGS OR INJECTORS | Move on to Step 6 1 | Cylinder compression insufficient | Move on to Step 5 1 | |
| 5 | CHECK ON CAUSE OF INSUFFICIENT COMPRESSION | All OK | Problems encountered | Operation |
- R/R head [PR_1016C10] for valve leakage test
| Move on to Step 6 1 | Valve seal insufficient | Overhaul the cylinder head Op. | |
| Cylinders/piston rings worn | Restore the seal | |||
| Cylinder head/cylinder block-crankcase matching faulty | Restore correct matching | |||
| 6 | CHECK ON CORRECT OPERATION | All OK | Problems encountered | Operation |
| Check that the fault is no longer present | End of diagnosis | Fault persists: control unit defective | Replace the engine management control unit Op. 1056F82 | |
The engine, particularly when cold, starts with difficulty and only after repeated attempts. When the key is turned the instruments light up as normal, the starter motor turns, but the engine is difficult to start.
| Results of the tests | ||||
| 0 | PRELIMINARY CHECKS | All OK | Problems encountered | Operation |
|---|---|---|---|---|
First, check:
| Move on to Step 1 1 | Air intake circuit component damaged | Repair or replace the damaged component | |
| Air filter blocked | Replace the filter Op. | |||
| 1 | CHECK USING DIAGNOSTIC EQUIPMENT | All OK | Problems encountered | Operation |
Connect the diagnostic equipment (Examiner or other instruments) to the diagnostic socket. Check:
| Move on to Step 2 1 | Error detected in the control unit | Proceed as instructed by the diagnostic tester | |
| Parameters not plausible | Proceed as instructed by the diagnostic tester | |||
| 2 | CHECK USING DIAGNOSTIC EQUIPMENT | All OK | Problems encountered | Operation |
| Carry out the active diagnosis for the canister solenoid valve | Move on to Step 3 1 | Solenoid valve faulty | Replace the solenoid valve Op. 1080E24 | |
| 3 | PETROL VAPOUR RECOVERY SYSTEM CHECK | All OK | Problems encountered | Operation |
| Check the seal of the petrol vapour recovery system | Move on to Step 4 1 | Air leaks | Restore the correct seal | |
| Pipes connected to the supply broken | Replace the pipes Op. 1080E48 | |||
| 4 | SUPPLY PRESSURE CHECK | All OK | Problems encountered | Operation |
Check that the fuel pressure is correct Op. | Move on to Step 5 1 | Fuel pressure too low: supply pipe obstructed | Eliminate the obstructions, if necessary, replace the pipe | |
| Fuel pressure too low: pump defective | Replace the pump assembly (see Op. Op. 1040A70 SUBMERGED PUMP ASSEMBLY COMPLETE WITH LEVEL GUAGE CONTROL - R + R | |||
| 5 | TIMING CHECK | All OK | Problems encountered | Operation |
Check that the valve gear timing is correct Op. | Move on to Step 6 1 | Valve gear timing not correct | Restore the correct valve gear timing Op. Op. 1032B10 TOOTHED TIMING BELT - R + R FOR TIMING ADJUSTMENT OR REPLACEMENT | |
| 6 | CYLINDER COMPRESSION CHECK | All OK | Problems encountered | Operation |
Carry out the cylinder compression check Op. Op. 0510A10 CYLINDER COMPRESSION - CHECK FOR LOOSE SPARK PLUGS OR INJECTORS | Move on to Step 8 1 | Cylinder compression insufficient | Move on to Step 7 1 | |
| 7 | CHECK ON CAUSE OF INSUFFICIENT COMPRESSION | All OK | Problems encountered | Operation |
R/R heads Op. 1016D11 to check the valve seal. Check condition of cylinders/piston rings | Move on to Step 8 1 | Valve seal insufficient | Overhaul the cylinder heads Op. | |
| Cylinders/piston rings worn | Restore the seal | |||
| 8 | CHECK ON CORRECT OPERATION | All OK | Problems encountered | Operation |
| Check that the fault is no longer present | End of diagnosis | Fault persists: control unit defective | Replace the control unit Op. 1056B82 | |
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