DIAGNOSTIC PROCEDURE
NO.29 SPARK PLUG CONDITION (MZI-3.7) DIAGNOSTIC PROCEDURE
and repair procedures. Read the following warnings before servicing the 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] .)
CAUTION:
z
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.
STEP
INSPECTION
RESULTS
ACTION
1
Remove all the spark plugs.
Inspect spark plug condition.
Is spark plug condition normal?
Yes
Troubleshooting completed.
No
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.
2
Are the spark plug wet/covered
with carbon by the engine oil?
Yes
Inspect all areas related to oil, working up and
down.
No
Go to the next step.
3
Inspect the spark plug for the
following:
z
Cracked insulator
z
Heat range
z
Air gap
z
Worn electrode
Yes
Go to the next step.
No
Replace the spark plug.
(See
SPARK PLUG
REMOVAL/INSTALLATION [MZI-3.7]
.)
2008 Mazda CX-9 Grand Touring
2008 ENGINE Symptom Troubleshooting (MZI-3.7) - Mazda CX-9
Microsoft
Sunday, November 15, 2009 10:10:06 AM
Page 92
© 2005 Mitchell Repair Information Company, LLC.
