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HOMESERVICE MANUALSMAZDA20066 I, 4D SEDAN, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISSYMPTOM TROUBLESHOOTING [ENGINE CONTROL SYSTEM L3)NO. 8 ENGINE RUNS ROUGH/ROLLING IDLENOTES
2006 Mazda 6 i, 4D Sedan, Automatic

No. 8 Engine Runs Rough/Rolling Idle: Notes

2006 Mazda 6 i, 4D Sedan, AutomaticSECTION Notes
POSSIBLE CAUSE DESCRIPTION

8 ENGINE RUNS ROUGH/ROLLING IDLE
DESCRIPTION 
  • Engine speed fluctuates between specified idle speed and lower speed and engine shakes excessively.
  • Idle speed is too slow and engine shakes excessively.
POSSIBLE CAUSE 
  • Air leakage from intake-air system parts
  • A/C system operation is improper
  • Erratic signal to ignition coil
  • Spark plug malfunction
  • Purge solenoid valve malfunction
  • Improper operation of electronic throttle control system
  • EGR valve malfunction
  • Erratic or no signal from CMP sensor
  • Low engine compression
  • Improper valve timing
  • Improper variable valve timing control system operation
  • Erratic signal from CKP sensor
  • Poor fuel quality
  • PCV valve malfunction
  • Air cleaner restriction
  • Restriction in exhaust system
  • Disconnected electrical connectors
  • Inadequate fuel pressure
  • Fuel pump body mechanical malfunction
  • Improper load signal input
  • Fuel line restriction or clogging
  • Improper fuel injection control operation
  • Fuel leakage from fuel injector
  • Fuel injector clogging
  • Engine overheating
  • Vacuum leakage
  • Pressure regulator malfunction
    WARNING: The following troubleshooting flow chart contains fuel system diagnosis and repair procedures. Read 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 REPAIR PROCEDURE" and "AFTER REPAIR PROCEDURE" described in this manual.

      (See BEFORE REPAIR PROCEDURE ).

      (See AFTER REPAIR PROCEDURE ).

    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.