Mazda CX-9 Grand Touring 2009 Manual page 1365

NO.19 EXHAUST SMOKE [MZI-3.7]
NO.19 EXHAUST SMOKE (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES
19 EXHAUST SMOKE
DESCRIPTION Blue, black, or white smoke from exhaust system
Blue smoke (Burning oil):
White smoke (Water in combustion):
Black smoke (Rich fuel mixture):
POSSIBLE
CAUSE
2008 Mazda CX-9 Grand Touring
2008 ENGINE Symptom Troubleshooting (MZI-3.7) - Mazda CX-9
(See PCM REMOVAL/INSTALLATION [MZI-3.7] .)
PCV valve malfunction
Engine internal oil leakage
Cooling system malfunction (coolant loss)
Engine internal coolant leakage
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
WARNING:
The following troubleshooting flow chart contains fuel system diagnosis and
repair procedures. Read 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 SERVICE
PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this
manual.
(See BEFORE SERVICE PRECAUTION [MZI-3.7] .)
(See AFTER SERVICE PRECAUTION [MZI-3.7] .)