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HOMESERVICE MANUALSMAZDA2013MX-5 MIATA GRAND TOURING, AUTOMATIC TRANSREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISSYMPTOM TROUBLESHOOTING [ENGINE CONTROL SYSTEM LF 2.0L]NO. 14 POOR FUEL ECONOMY [LF]
2013 Mazda MX-5 Miata Grand Touring, Automatic Trans

No. 14 Poor Fuel Economy [LF]

2013 Mazda MX-5 Miata Grand Touring, Automatic TransSECTION No. 14 Poor Fuel Economy [LF]
14  POOR FUEL ECONOMY 
DESCRIPTION 
  • The fuel economy is unsatisfactory.
POSSIBLE CAUSE 
  • Contaminated air cleaner element
  • Variable intake air control malfunction
  • Engine cooling system malfunction
  • Improper ATF level (AT)
  • Weak spark
  • Poor fuel quality
  • Erratic or no signal from CMP sensor
  • Clutch slippage (MT)
  • Improper variable valve timing control system operation
  • Improper coolant level
  • Inadequate fuel pressure
  • Spark plug malfunction
  • PCV valve malfunction
  • Brake dragging
  • Improper valve timing due to jumping out of timing belt
  • Contaminated MAF sensor
  • Improper engine compression
  • Exhaust system clogging
    WARNING: The following troubleshooting flow chart contains fuel system diagnosis and repair procedures. Read following warnings before servicing 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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    When to See a Mechanic

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

    • • You smell fuel, burning insulation, or see smoke.
    • • Brakes feel soft, pull hard to one side, or make grinding noises.
    • • The engine overheats, stalls repeatedly, or misfires under load.
    • • You are missing required tools, torque specs, or safe lifting equipment.
    • • You are not confident in the next step or safety outcome.