2020 Mazda CX-30 Base, AWDFACTORY OEM SERVICE PROCEDURE

Spark Plug Condition: Notes

SPARK PLUG CONDITION (SKYACTIV-G) DESCRIPTION AND POSSIBLE CAUSE

Troubleshooting item Spark plug condition
Description
  • Incorrect spark plug condition.
Possible cause
NOTE:
  • Inspecting the spark plug conditions 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
  • Malfunction spark plug
Grayish white with specific plug:
  • Air/fuel mixture-Insufficient fuel injection volume
  • Malfunction spark plug
If a spark plug on a specific cylinder is damaged or corroded:
  • Malfunction spark plug
    • Damage or corrosion due to pre-ignition or knocking
Wet/carbon is stuck on all plugs:
  • Spark-Spark weak
  • Air/fuel mixture-Too rich, excessive fuel line pressure
  • Erratic signal to PCM
    • ECT sensor No. 1 or related circuit malfunction
    • ECT sensor No. 2 or related circuit malfunction
    • MAF sensor or related circuit malfunction
    • A/F sensor or related circuit malfunction
      • HO2S or related circuit malfunction
  • Compression-Low compression
  • Restriction in intake/exhaust system
Grayish white with all plugs:
  • Erratic signal to PCM
    • ECT sensor No. 1 or related circuit malfunction
    • ECT sensor No. 2 or related circuit malfunction
    • MAF sensor or related circuit malfunction
    • A/F sensor or related circuit malfunction
      • HO2S or related circuit malfunction
  • Air/fuel mixture-Too lean, insufficient fuel line pressure
Possible cause
WARNING:
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