NO.19 EXHAUST SMOKE [LF]
B3E010318881W21
19
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EXHAUST SMOKE
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DESCRIPTION |
Blue, black, or white smoke from exhaust system
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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 restriction
• Intake-air system is collapsed or restricted.
• Fuel return line is restricted.
• Excessive fuel pressure
• Improper engine compression
• Injector fuel leakage
• Ignition system malfunction
The following troubleshooting flow chart contains fuel system diagnosis and repair procedures. Read following warnings before performing fuel system services:
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Diagnostic procedure
STEP
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INSPECTION
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RESULTS
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ACTION
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1
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What color is smoke coming from the exhaust system?
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Blue
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Burning oil is indicated.
Go to the next step.
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White
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Water in combustion is indicated.
Go to Step 3.
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Black
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Rich fuel mixture is indicated.
Go to Step 4.
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2
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Remove and shake the PCV valve.
Does the PCV valve rattle?
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Yes
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Inspect for the following:
• Damaged valve guide, stems or valve seals
• Blocked oil drain passage in cylinder head
• Piston ring is not seated, seized or worn.
• Damaged cylinder bore
If other drivability symptoms are present, return to diagnostic index to service any additional symptoms.
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No
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Replace the PCV valve.
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3
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Does the cooling system hold pressure?
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Yes
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Inspect for the following:
• Cylinder head gasket leakage
• Intake manifold gasket leakage
• Cracked or porous engine block
If other drivability symptoms are present, return to diagnostic index to service any additional symptoms.
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No
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Inspect for cause.
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4
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Inspect for the following:
• Air cleaner restriction
• Collapsed or restricted intake-air system
• Restricted fuel return line
Are all items normal?
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Yes
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Go to the next step.
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No
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Service if necessary.
Repeat Step 4.
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5
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Connect the WDS or equivalent to the DLC-2.
Retrieve any continuous memory, KOEO and KOER DTCs using WDS or equivalent.
Are there any DTCs displayed?
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Yes
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DTC is displayed:
Go to the appropriate DTC inspection.
(See DTC TABLE [LF].)
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No
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No DTC is displayed:
Go to the next step.
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6
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Install fuel pressure gauge between the fuel pipe and fuel distributor.
Start the engine and idle it.
Measure fuel line pressure during idle.
Is fuel line pressure correct during idle?
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Yes
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Go to the next step.
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No
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Low:
Inspect the fuel line for clogging.
• If there is no malfunction, replace the fuel pump unit.
High:
Replace the fuel pump unit.
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7
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Is strong blue spark visible at each disconnected high-tension lead while cranking the engine?
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Yes
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Inspect spark plugs and CMP sensor.
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No
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Inspect following:
• High-tension leads
• Ignition coil and connector
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8
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Verify test results.
• If normal, return to diagnostic index to service any additional symptoms.
• If malfunction remains, inspect related Service information perform repair or diagnosis.
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