NO.19 EXHAUST SMOKE [MZI-3.7]
NO.19 EXHAUST SMOKE (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES
(See
PCM REMOVAL/INSTALLATION [MZI-3.7]
.)
19
EXHAUST SMOKE
DESCRIPTION
Blue, black, or white smoke from exhaust system
POSSIBLE
CAUSE
Blue smoke (Burning oil):
z
PCV valve malfunction
z
Engine internal oil leakage
White smoke (Water in combustion):
z
Cooling system malfunction (coolant loss)
z
Engine internal coolant leakage
Black smoke (Rich fuel mixture):
z
Air cleaner restriction
z
Intake-air system is collapsed or restricted.
z
Fuel return line is restricted.
z
Excessive fuel pressure
z
Improper engine compression
z
Injector fuel leakage
z
Ignition system malfunction
WARNING:
The following troubleshooting flow chart contains fuel system diagnosis and
repair procedures. Read following warnings before servicing fuel system:
z
Fuel vapor is hazardous. It can easily ignite, causing serious injury
and damage. Always keep sparks and flames away from fuel.
z
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] .)
2008 Mazda CX-9 Grand Touring
2008 ENGINE Symptom Troubleshooting (MZI-3.7) - Mazda CX-9
Microsoft
Sunday, November 15, 2009 10:10:05 AM
Page 74
© 2005 Mitchell Repair Information Company, LLC.
