NO.19 EXHAUST SMOKE [L8, LF, L5]
id010346803900
19 |
EXHAUST SMOKE |
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DESCRIPTION
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Blue, black, or white smoke from exhaust system
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POSSIBLE CAUSE
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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
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Diagnostic procedure
STEP |
INSPECTION |
RESULTS |
ACTION |
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1
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What color is the 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 the 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 the cylinder head
• Piston ring is not seated, seized or worn.
• Damaged cylinder bore
If other drivability symptoms are present, return to the 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 M-MDS to the DLC-2.
Switch the ignition to ON (Engine off).
Retrieve any DTCs.
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 [L8, LF, L5].)
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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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Inspect the fuel line pressure.
Is the fuel line pressure correct?
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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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Perform the spark test.
Is a strong blue spark visible at each cylinder?
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Yes
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Inspect the CMP sensor.
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No
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Repair or replace the malfunctioning part according to spark test result.
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8
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• Verify test results.
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