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Home >> Mazda >> 2006 >> MPV LX >> Repair and Diagnosis >> Engine Performance >> System >> Symptom Troubleshooting [Engine Control System AJ) >> No. 14 Poor Fuel Economy >> Notes
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No. 14 Poor Fuel Economy: Notes

POOR FUEL ECONOMY POSSIBLE CAUSE DESCRIPTION

14 Poor fuel economy.
DESCRIPTION 
  • Fuel economy is unsatisfactory.
POSSIBLE CAUSE 
  • Contaminated air cleaner element.
  • IMCC malfunction.
  • Engine cooling system malfunction.
  • Improper ATF 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 clogging.
    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 REPAIR PROCEDURE" and "AFTER REPAIR PROCEDURE" described in this file. (See BEFORE REPAIR PROCEDURE .) (See AFTER REPAIR PROCEDURE .)
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