NO.19 EXHAUST SMOKE


19	EXHAUST SMOKE
DESCRIPTION	Blue, black, or white smoke from the exhaust system
POSSIBLE CAUSE	Blue smoke (Burning oil): • Engine internal oil leakage (Oil seal, side seal, apex seal etc.) White smoke (Water in combustion): • Cooling system malfunction (coolant loss) • Engine internal coolant leakage Black smoke (Rich fuel mixture): • Air cleaner restriction • Intake-air system is collapsed or restricted. • Excessive fuel pressure • Improper engine compression – Engine internal malfunction – Abnormal engine oil condition (viscosity, deterioration) – Low oil pressure – Excessive fuel pressure – Air mixed in oil line – Metering oil pump malfunction • Leakage or clogging in oil pipe • Leakage or clogging in oil nozzle • Injector fuel leakage • Ignition system malfunction Warning The following troubleshooting flow chart contains fuel system diagnosis and repair procedures. Read the following warnings before servicing fuel system: • 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 REPAIR PROCEDURE" and "AFTER REPAIR PROCEDURE" described in this manual. (See BEFORE REPAIR PROCEDURE.) (See AFTER REPAIR PROCEDURE.) Caution • Disconnecting/connecting quick release connector without cleaning it may possibly cause damage to fuel pipe and quick release connector. Always clean quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign material.


STEP	INSPECTION	RESULTS	ACTION
1	What color is the smoke coming from the 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	Perform the metering oil pump control inspection. (See Metering Oil Pump Control Inspection.) Does the metering oil pump control properly?	Yes	Overhaul the engine and repair or replace the malfunctioning part.
2		No	Repair or replace the malfunctioning parts, according to the metering oil pump control inspection results.
3	Does the cooling system hold pressure?	Yes	Inspect for the following: • Gasket leakage • Intake manifold gasket leakage • Cracked or porous rotor housing If other drivability symptoms are present, return to the the diagnostic index to service any additional symptoms.
3	Does the cooling system hold pressure?	No	Inspect for cause.
4	Inspect for the following: • Air cleaner restriction • Collapsed or restricted intake-air system Are all the items normal?	Yes	Go to the next step.
4		No	Service if necessary. Repeat Step 4.
5	Connect the WDS or equivalent to the DLC-2. Retrieve any continuous memory, KOEO and KOER DTCs. Are there any DTCs displayed?	Yes	DTC is displayed: Go to the applicable DTC inspection. (See DTC TABLE.)
5		No	No DTC is displayed: Go to the next step.
6	Install the fuel pressure gauge to the fuel line quick release connector. Start the engine and run it at idle. Measure the fuel line pressure at idle. Is the fuel line pressure correct at idle? (See FUEL LINE PRESSURE INSPECTION.)	Yes	Go to the next step.
6		No	Zero or low: Inspect for clogged fuel line. If normal, replace the fuel pump unit. (See FUEL PUMP UNIT REMOVAL/INSTALLATION.) High: Replace the fuel pump unit. (See FUEL PUMP UNIT REMOVAL/INSTALLATION.)
7	Inspect the engine compression. (See COMPRESSION INSPECTION.) Is it normal?	Yes	Visually inspect for the exhaust system part.
7		No	Go to the next step.
8	Perform the metering oil pump control inspection. (See Metering Oil Pump Control Inspection.) Does the metering oil pump control operate properly?	Yes	Go to the next step.
8		No	Repair or replace the malfunctioning part according to the inspection results. After that overhaul or replace the engine. (See Engine Workshop Manual.)
9	Check the engine oil condition. Is the engine oil low viscosity and/or is there a gasoline odor?	Yes	Replace the engine oil. Inspect the ECT sensor and the related wiring harnesses. (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION.) After that overhaul or replace the engine. (See Engine Workshop Manual.)
9		No	Go to the next step.
10	Inspect the oil pressure. (See OIL PRESSURE INSPECTION.) Is the oil pressure within the specification?	Yes	Go to the next step.
10		No	Repair or replace the malfunctioning part according to the inspection results. After that overhaul or replace the engine. (See Engine Workshop Manual.)
11	Check the oil pipe between the metering oil pipe and the metering oil nozzle. Is there any air and/or clogging in the oil pipe?	Yes	Inspect and repair for leakage and/or clogging in the oil passage at engine. After that overhaul or replace the engine. (See Engine Workshop Manual.)
11		No	Overhaul or replace the engine. (See Engine Workshop Manual.)
12	Is a strong blue spark visible at each disconnected high-tension lead while cranking the engine?	Yes	Inspect the spark plugs and the eccentric shaft position sensor.
12		No	Inspect the following: • High-tension leads • Ignition coil and connector • Engine compression
13	Verify test results. • If normal, return to the diagnostic index to service any additional symptoms. • If the malfunction remains, inspect the related Service Information and perform the repair or diagnosis.