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


19	Exhaust smoke
DESCRIPTION	• Blue, black, or white smoke from 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. (See BEFORE SERVICE PRECAUTION [AJ (3.0L Duratec)].) (See AFTER SERVICE PRECAUTION [AJ (3.0L Duratec)].)


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 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.
2	• Remove and shake PCV valve. • Does PCV valve rattle?	No	Replace PCV valve.
3	• Does cooling system hold pressure?	Yes	Inspect for 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.
3	• Does cooling system hold pressure?	No	Inspect for cause.
4	• Inspect for following: - Air cleaner restriction - Collapsed or restricted intake-air system - Restricted fuel return line • Are all items okay?	Yes	Go to the next step.
4		No	Service as necessary. Repeat Step 4.
5	• Connect WDS or equivalent to DLC-2. • Turn ignition switch on. • Retrieve any DTC. • Is "PASSED" displayed?	Yes	No DTC displayed: • Go to the next step.
5		No	DTC displayed: • Go to 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? (See FUEL LINE PRESSURE INSPECTION [AJ (3.0L Duratec)].)	Yes	Go to the next step.
6		No	Zero or low: Inspect clogged fuel line. • If normal, replace the fuel pump unit. (See FUEL PUMP UNIT REMOVAL/INSTALLATION [AJ (3.0L Duratec)].) High: Replace the fuel pump unit. (See FUEL PUMP UNIT REMOVAL/INSTALLATION [AJ (3.0L Duratec)],)
7	• Perform the spark test. (See Spark Test.) • Is strong blue spark visible at each cylinder?	Yes	Inspect sparks plug s and CMP sensor. (See SPARK PLUG INSPECTION [L3, AJ (3.0L Duratec)]) (See CAMSHAFT POSITION (CMP) SENSOR INSPECTION [AJ (3.0L Duratec)].)
7		No	Repair or replace malfunctioning part according to spark test result.
8	• Verify test results. - If okay, return to 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 PCM.