27 Spark Plug Condition [Z6] - Mazda 3 Workshop Manual

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
(See ENGINE SYMPTOM TROUBLESHOOTING
• If malfunction remains, inspect related Service information perform repair or diagnosis.
- If vehicle repaired, troubleshooting completed.
- If vehicle not repaired or additional diagnostic information not available, replace the
PCM.
(See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION
NO.27 SPARK PLUG CONDITION [Z6]
27
DESCRIPTION Incorrect spark plug condition
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
POSSIBLE Wet/carbon is stuck on all plugs:
CAUSE
• Spark-Spark weak
• Air/fuel mixture-Too rich
• Compression-Low compression
• Clogging in intake/exhaust system
Grayish white with all plugs:
• Air/fuel mixture-Too lean
The following troubleshooting flow chart contains the fuel system diagnosis and repair
procedures. Read the following warnings before performing the fuel system services:
Downloaded from
SPARK PLUG CONDITION
Note
• Inspecting spark plug condition can determine whether problem is related to
a specific cylinder possibly all cylinders.
Warning
• Fuel vapor is hazardous. It can easily ignite, causing serious injury and
damage. Always keep sparks and flames away from fuel.
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