Mazda CX-9 Grand Touring 2009 Manual page 1383

DIAGNOSTIC PROCEDURE
NO.29 SPARK PLUG CONDITION (MZI-3.7) DIAGNOSTIC PROCEDURE
STEP INSPECTION
Remove all the spark plugs.
1 Inspect spark plug condition.
Is spark plug condition normal?
Are the spark plug wet/covered
2
with carbon by the engine oil?
Inspect the spark plug for the
following:
3
Cracked insulator
Heat range
Air gap
Worn electrode
2008 Mazda CX-9 Grand Touring
2008 ENGINE Symptom Troubleshooting (MZI-3.7) - Mazda CX-9
and repair procedures. Read the following warnings before servicing the 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] .)
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
Yes
No
Yes
No
Yes
No
ACTION
Troubleshooting completed.
Specific plug is wet or covered with carbon:
Go to the next step.
Specific plug looks grayish white:
Go to Step 7.
All plugs are wet or covered with carbon:
Go to Step 9.
All plugs look grayish white:
Go to Step 15.
Inspect all areas related to oil, working up and
down.
Go to the next step.
Go to the next step.
Replace the spark plug.
(See SPARK PLUG
REMOVAL/INSTALLATION [MZI-3.7] .)