Mazda CX-9 Grand Touring 2009 Manual page 1366

DIAGNOSTIC PROCEDURE
NO.19 EXHAUST SMOKE (MZI-3.7) DIAGNOSTIC PROCEDURE
STEP INSPECTION
What color is smoke coming from
1
the exhaust system?
Remove and shake the PCV
2 valve.
Does the PCV valve rattle?
Does the cooling system hold
3
pressure?
Inspect for the following:
Air cleaner restriction
2008 Mazda CX-9 Grand Touring
2008 ENGINE Symptom Troubleshooting (MZI-3.7) - Mazda CX-9
CAUTION:
Disconnecting/connecting quick release connector without cleaning it
may 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.
RESULTS
Blue
White
Black
Yes
No
Yes
No
Yes
ACTION
Burning oil is indicated.
Go to the next step.
Water in combustion is indicated.
Go to Step 3.
Rich fuel mixture is indicated.
Go to Step 4.
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 driveability symptoms are present, return to
diagnostic index to service any additional
symptoms.
Replace the PCV valve.
Inspect for the following:
Cylinder head gasket leakage
Intake manifold gasket leakage
Cracked or porous engine block
If other driveability symptoms are present, return to
diagnostic index to service any additional
symptoms.
Inspect for cause.
Go to the next step.