2014 Mazda 3 SV, Automatic TransFACTORY OEM SERVICE PROCEDURE

No. 13 Knocking/Pinging-Acceleration/Cruise: Notes

NO. 13 KNOCKING/PINGING-ACCELERATION/CRUISE DESCRIPTION AND POSSIBLE CAUSES (SKYACTIV-G 2.0, SKYACTIV-G 2.5)

13  KNOCKING/PINGING-ACCELERATION/CRUISE 
DESCRIPTION 
  • Abnormal combustion occurs under the condition such as the temperature in the combustion chamber is too high resulting in abnormal noise.
  • Knocking sound occurs from the engine compartment during acceleration.
POSSIBLE CAUSE 
  • Poor fuel quality
    • Fuel RON is not specified
    • Excessive cleaning agents added in fuel
  • Poor connection of KS, wiring harness
  • The following information for calculating ignition timing is incorrect:
    • KS signal
    • ECT sensor No. 1 signal
    • IAT sensor No. 2 (integrated in MAP sensor) signal
    • MAF sensor signal
      • Air suction in intake-air system
    • MAP sensor signal
  • Combustion temperature is high
    • Cooling system malfunction
    • Carbon accumulation
    • Use of non-genuine spark plug
      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 SERVICE PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this manual. (See BEFORE SERVICE PRECAUTION .) (See AFTER SERVICE PRECAUTION .)
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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.