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HOMESERVICE MANUALSMAZDA2008TRIBUTE S SPORT, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 501 (SYMPTOM TROUBLESHOOTING [ENGINE CONTROL SYSTEM BP, BP WITH TC))NO.14 POOR FUEL ECONOMYNOTES
2008 Mazda Tribute s Sport, 4WD

No.14 Poor Fuel Economy: Notes

2008 Mazda Tribute s Sport, 4WDSECTION Notes
WARNING: This page is about a different car, the 2005 Mazda MX-5 Miata. However, it is still accessible from the selected car via links, so may be relevant.
NO.14 POOR FUEL ECONOMY [BP, BP WITH TC] DESCRIPTION & POSSIBLE CAUSE

14 Poor fuel economy
DESCRIPTION 
  • Fuel economy is unsatisfactory.
POSSIBLE CAUSE 
  • Contaminated air cleaner element
  • Engine cooling system malfunction
  • Improper transmission fluid level
  • Weak spark
  • Poor fuel quality
  • Erratic or no signal from CMP sensor
  • 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 clogged
  • Variable valve timing system malfunction
    WARNING:
    • The following troubleshooting flow chart contains the fuel system diagnosis and repair procedures. Read the following warnings before performing the fuel system services:
      • 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" and "AFTER SERVICE PRECAUTION".

        (See BEFORE SERVICE PRECAUTION )

        (See AFTER SERVICE PRECAUTION )

    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.