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

WARNING: This page is about a different car, the 2005 Mazda RX-8. However, it is still accessible from the selected car via links, so may be relevant.

NO.13 DESCRIPTION AND POSSIBLE CAUSE

13	KNOCKING/PINGING/DETONATION - ACCELERATION/CRUISE
DESCRIPTION	A sound is produced when the air/fuel mixture is ignited by something other than the spark plug (e.g., hot spot in combustion chamber).
POSSIBLE CAUSE	Air suction at intake-air system Poor fuel quality Inadequate fuel pressure Pressure regulator (integrated in fuel pump unit) malfunction Fuel pump relay stuck closed Fuel injector malfunction (clogging, lack of injection amount) Erratic signal from eccentric shaft position sensor Improper ignition timing control (ECT, IAT, MAF and knock signals to PCM) Incorrect spark plug heat range Improper operation of eccentric shaft bypass valve Engine overheating due to cooling system malfunction Excessive carbon is built up in combustion chamber Inadequate engine compression Engine internal malfunction Abnormal engine oil condition (viscosity, deterioration) Low oil pressure Excessive fuel pressure Air mixed in oil malfunction Metering oil pump malfunction Leakage or clogging in oil pipe Leakage or clogging in oil nozzle WARNING: The following troubleshooting flow chart contains fuel system diagnosis and repair procedures. Read the 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 article. (See BEFORE REPAIR PROCEDURE .) (See AFTER REPAIR PROCEDURE .) CAUTION: Disconnecting/connecting quick release connector without cleaning it may possibly cause damage to fuel pipe and quick release connector. Always clean quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign material.

KNOCKING/PINGING/DETONATION - ACCELERATION/CRUISE

DESCRIPTION

A sound is produced when the air/fuel mixture is ignited by something other than the spark plug (e.g., hot spot in combustion chamber).

POSSIBLE CAUSE

Air suction at intake-air system
Poor fuel quality
Inadequate fuel pressure
Pressure regulator (integrated in fuel pump unit) malfunction
Fuel pump relay stuck closed
Fuel injector malfunction (clogging, lack of injection amount)
Erratic signal from eccentric shaft position sensor
Improper ignition timing control (ECT, IAT, MAF and knock signals to PCM)
Incorrect spark plug heat range
Improper operation of eccentric shaft bypass valve
Engine overheating due to cooling system malfunction
Excessive carbon is built up in combustion chamber
Inadequate engine compression
- Engine internal malfunction
- Abnormal engine oil condition (viscosity, deterioration)
- Low oil pressure
- Excessive fuel pressure
- Air mixed in oil malfunction
- Metering oil pump malfunction
  - Leakage or clogging in oil pipe
  - Leakage or clogging in oil nozzle
WARNING:
The following troubleshooting flow chart contains fuel system diagnosis and repair procedures. Read the 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 article.
  (See BEFORE REPAIR PROCEDURE .)
  
  (See AFTER REPAIR PROCEDURE .)
CAUTION:
- Disconnecting/connecting quick release connector without cleaning it may possibly cause damage to fuel pipe and quick release connector. Always clean quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign material.