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HOMESERVICE MANUALSMAZDA2013MX-5 MIATA GRAND TOURING, AUTOMATIC TRANSREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISSYMPTOM TROUBLESHOOTING [ENGINE CONTROL SYSTEM LF 2.0L]NO. 29 SPARK PLUG CONDITION [LF]
2013 Mazda MX-5 Miata Grand Touring, Automatic Trans

No. 29 Spark Plug Condition [LF]

2013 Mazda MX-5 Miata Grand Touring, Automatic TransSECTION No. 29 Spark Plug Condition [LF]
29  SPARK PLUG CONDITION 
DESCRIPTION 
  • An incorrect spark plug condition.
POSSIBLE CAUSE 
NOTE:
  • Inspecting spark plugs condition can determine whether 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
Wet/carbon is stuck on all plugs: 
  • Spark-Spark weak
  • Air/fuel mixture-Too rich, excessive fuel line pressure
  • Compression-Low compression
  • Clogging in intake/exhaust system
Grayish white with all plugs: 
  • Air/fuel mixture-Too lean, insufficient fuel line pressure
    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 SERVICE PRECAUTION [LF] " and "AFTER SERVICE PRECAUTION [LF] ".
    RENDER: 1.0x

    NO RELATED

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    Stop DIY work and contact a certified mechanic immediately if any of the following apply:

    • • You smell fuel, burning insulation, or see smoke.
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    • • You are missing required tools, torque specs, or safe lifting equipment.
    • • You are not confident in the next step or safety outcome.