NO.19 EXHAUST SMOKE[AJ (3.0L Duratec)]

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19
Exhaust smoke
DESCRIPTION
•  Blue, black, or white smoke from the exhaust system
POSSIBLE CAUSE
Blue smoke (Burning oil):
•  PCV valve malfunction
•  Engine internal oil leakage
White smoke (Water in combustion):
•  Cooling system malfunction (coolant loss)
•  Engine internal coolant leakage
Black smoke (Rich fuel mixture):
•  Air cleaner is restricted.
•  Intake-air system collapsed or restricted.
•  Fuel return line is restricted.
•  Excessive fuel pressure
•  Improper engine compression
•  Injector fuel leakage
•  Ignition system malfunction
Warning
•  The following troubleshooting flow chart contains the fuel system diagnosis and repair procedures. Read the following warnings before performing the fuel system services:
―  Fuel vapor is hazardous. It can easily ignite, causing serious injury and damage. Always keep sparks and flames away from fuel.
―  Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injuries or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete “BEFORE SERVICE PRECAUTION” and “AFTER SERVICE PRECAUTION” described in this manual.

Diagnostic procedure

STEP

INSPECTION

RESULTS

ACTION
1
•  What color is smoke coming from exhaust system?
Blue
Burning oil is indicated.
Go to the next step.
White
Water in combustion is indicated.
Go to Step 3.
Black
Rich fuel mixture is indicated.
Go to Step 4.
2
•  Remove and shake PCV valve.
•  Does PCV valve rattle?
Yes
Inspect for the following:
•  Damaged valve guide, stems or valve seals
•  Blocked oil drain passage in cylinder head
•  Piston rings are not seated, seized or worn.
•  Damaged cylinder bore
―  If other drivability symptoms are present, return to diagnostic index to service any additional symptoms.
No
Replace the PCV valve.
3
•  Does cooling system hold pressure?
Yes
Inspect for the following:
•  Cylinder head gasket leakage
•  Intake manifold gasket leakage
•  Engine block cracks or porosity
―  If other drivability symptoms are present, return to diagnostic index to service any additional symptoms.
No
Inspect for cause.
4
•  Inspect for the following:
―  Air cleaner restriction
―  Collapsed or restricted intake-air system
―  Restricted fuel return line
•  Are all items normal?
Yes
Go to the next step.
No
Service if necessary.
Repeat Step 4.
5
•  Connect the M-MDS to the DLC–2.
•  Turn ignition switch on.
•  Retrieve any DTCs.
•  Is “PASSED” displayed?
Yes
No DTC displayed:
•  Go to the next step.
No
DTC displayed:
•  Go to the appropriate DTC test.
6
•  Install the fuel pressure gauge to fuel line.
•  Start the engine run it at idle.
•  Measure the fuel line pressure at idle.
•  Is the fuel line pressure correct?
Yes
Go to the next step.
No
Zero or low:
Inspect the clogged fuel line.
•  If normal, replace the fuel pump unit.
High:
Replace the fuel pump unit.
(See FUEL PUMP UNIT REMOVAL/INSTALLATION[AJ (3.0L Duratec)].)
7
•  Perform the spark test.
•  Is the strong blue spark visible at each cylinder?
Yes
Inspect the sparks plug s and CMP sensor.
(See SPARK PLUG INSPECTION[AJ (3.0L Duratec)].)
(See CAMSHAFT POSITION (CMP) SENSOR INSPECTION[AJ (3.0L Duratec)].)
No
Repair or replace the malfunctioning part according to the spark test result.
8
•  Verify the test results.
―  If normal, return to the diagnostic index to service any additional symptoms.
―  If malfunction remains, inspect related Service Information and perform repair or diagnosis.
•  If vehicle is repaired, troubleshooting completed.
•  If vehicle is not repaired or additional diagnostic information is not available, replace the PCM.