No.29 Spark Plug Condition - Mazda CX-7 2007 Workshop Manual

SYMPTOM TROUBLESHOOTING [L3 WITH TC]
STEP
3 Verify test results.
• If normal, return to the diagnostic index to service any additional symptoms.
• If a malfunction remains, inspect the related Service Bulletins and/or On-line Repair Information and perform the
repair or diagnosis.
— If the vehicle is repaired, troubleshooting is completed.
— If the vehicle is not repaired or additional diagnostic information is not available, reprogram the PCM if a later
calibration is available. Retest.
End Of Sie
NO.29 SPARK PLUG CONDITION[L3 WITH TC]
29 SPARK PLUG CONDITION
DESCRIPTION Incorrect spark plug condition
Note
• Inspecting the condition of the spark plugs can determine whether a problem is related to a
specific cylinder or possibly all cylinders.
Wet/carbon stuck on specific plug:
• Spark— Weak, not visible
• Air/fuel mixture— Excessive fuel injection volume
• Compression— No compression, low compression
• Malfunctioning spark plug
Grayish white with specific plug:
• Air/fuel mixture— Insufficient fuel injection volume
• Malfunctioning spark plug
Wet/carbon is stuck on all plugs:
• Spark— Spark weak
• Air/fuel mixture— Too rich
• Compression— Low compression
• Clogging in intake/exhaust system
Grayish white with all plugs:
POSSIBLE CAUSE
• Air/fuel mixture— Too lean
Warning
The following troubleshooting flow chart contains the fuel system diagnosis 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 REPAIR PROCEDURE" and "AFTER REPAIR PROCEDURE" described in this
manual.
Caution
• Disconnecting/connecting the quick release connector without cleaning it may possibly
cause damage to the fuel pipe and quick release connector. Always clean the quick release
connector joint area before disconnecting/connecting, and make sure that it is free of
foreign material.
Diagnostic procedure
STEP INSPECTION
1 Remove all the spark plugs.
Inspect the spark plug condition.
Is the spark plug condition normal?
2 Is the spark plug wet/covered with carbon from
engine oil?
INSPECTION
(See01-14-4 BEFORE REPAIR PROCEDURE[L3 WITH TC].)
(See01-14-4 AFTER REPAIR PROCEDURE[L3 WITH TC].)
RESULTS
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 9.
All plugs are wet or covered with carbon:
Go to Step 11.
All plugs look grayish white:
Go to Step 19.
Yes Inspect all areas related to oil.
No Go to the next step.
ACTION
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ACTION
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