No.13 Knocking/Pinging: Notes

DESCRIPTION AND POSSIBLE CAUSE

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 or related circuit malfunction Boost air temperature sensor or related circuit malfunction Incorrect fuel injection timing or amount Fuel injector malfunction KS or related circuit malfunction Ignition system malfunction Erratic signal from CMP sensor Inadequate engine compression Inadequate fuel pressure (high-pressure side) MAP sensor or related malfunction Wastegate valve malfunction (stuck closed) Charge air cooler malfunction Fuel pressure sensor or related circuit malfunction APP sensor or related circuit malfunction Suction control valve malfunction (built-in high pressure fuel pump) Exhaust system and/or 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 SERVICE PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this manual. (See BEFORE SERVICE PRECAUTION .) (See AFTER SERVICE PRECAUTION .) CAUTION: Disconnecting/connecting the quick release connector without cleaning it may possibly cause damage to the fuel pipe and quick release connector. Always clean the quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign material.

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 or related circuit malfunction
Boost air temperature sensor or related circuit malfunction
Incorrect fuel injection timing or amount
Fuel injector malfunction
KS or related circuit malfunction
Ignition system malfunction
Erratic signal from CMP sensor
Inadequate engine compression
Inadequate fuel pressure (high-pressure side)
MAP sensor or related malfunction
Wastegate valve malfunction (stuck closed)
Charge air cooler malfunction
Fuel pressure sensor or related circuit malfunction
APP sensor or related circuit malfunction
Suction control valve malfunction (built-in high pressure fuel pump)
Exhaust system and/or 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 SERVICE PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this manual. (See BEFORE SERVICE PRECAUTION .) (See AFTER SERVICE PRECAUTION .)
CAUTION:
- Disconnecting/connecting the quick release connector without cleaning it may possibly cause damage to the fuel pipe and quick release connector. Always clean the quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign material.