2007 Mazda 6 MazdaspeedFACTORY OEM SERVICE PROCEDURE

No. 13 Knocking/Pinging: Notes

POSSIBLE CAUSES DESCRIPTIONS

13 KNOCKING/PINGING
DESCRIPTION  Sound is produced when air/fuel mixture is ignited by something other than a spark plug (e.g., hot spot in the combustion chamber).
POSSIBLE CAUSE 
  • Poor fuel quality
  • Engine overheating due to cooling system malfunction
  • Variable swirl valve stuck closed
  • Improper operation of electronic throttle system
  • Air leakage or restriction from intake-air system
  • ECT sensor or related circuit malfunction
  • MAF sensor or related circuit malfunction
  • IAT sensor No.1 or related circuit malfunction
  • IAT sensor No.2 or related circuit malfunction
  • Incorrect fuel injection timing or amount
  • Fuel injector malfunction
  • Knock sensor or related circuit malfunction
  • Ignition system malfunction
  • Erratic signal from CMP sensor
  • Inadequate engine compression
  • Inadequate fuel pressure (high-pressure side)
  • Manifold absolute pressure (MAP) sensor or related malfunction
  • Wastegate valve malfunction (stuck closed)
  • Charge air cooler malfunction
  • Fuel pressure sensor or related circuit malfunction
  • Accelerator position sensor or related circuit malfunction
  • Suction control valve malfunction (built-in high pressure fuel pump)
  • Exhaust system and/or three-way catalytic converter (TWC) restriction
  • EGR 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 injury 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 ).

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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.

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