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HOMESERVICE MANUALSMAZDA20066 I, 4D SEDAN, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISSYMPTOM TROUBLESHOOTING [ENGINE CONTROL SYSTEM L3)NO. 19 EXHAUST SMOKENOTES
2006 Mazda 6 i, 4D Sedan, Automatic

No. 19 Exhaust Smoke: Notes

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

19 EXHAUST SMOKE
DESCRIPTION  Blue, black, or white smoke from exhaust system
POSSIBLE CAUSE  Blue smoke (Burning oil): 
  • PCV valve malfunction
  • Engine internal oil leakage

White smoke (Water in combustion): 
  • Cooling system malfunction (coolant loss)
  • Engine internal coolant leakage

Black smoke (Rich fuel mixture): 
  • Air cleaner restriction
  • Intake-air system is collapsed or restricted.
  • Fuel return line is restricted.
  • Excessive fuel pressure
  • Improper engine compression
  • Injector fuel leakage
  • Ignition system malfunction
    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 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.