No. 28 - Spark Plug Condition: Notes
NO. 28 SPARK PLUG CONDITION DESCRIPTION AND POSSIBLE CAUSE
| 28 |
SPARK PLUG CONDITION |
| DESCRIPTION |
- Incorrect spark plug condition.
|
| POSSIBLE CAUSE |
NOTE:
- Inspecting the spark plug conditions can determine whether a problem is related to a specific cylinder or possibly all cylinders.
Wet/carbon stuck on specific plug:
- Spark-Weak, not visible
- Air/fuel mixture-Excessive fuel injection volume
- Compression-No compression, low compression
- Malfunction spark plug
Grayish white with specific plug:
- Air/fuel mixture-Insufficient fuel injection volume
- Malfunction spark plug
If a spark plug on a specific cylinder is damaged or corroded:
- Damage or corrosion due to pre-ignition or knocking
Wet/carbon is stuck on all plugs:
- Spark-Spark weak
- Air/fuel mixture-Too rich, excessive fuel line pressure
- Erratic signal to PCM
- ECT sensor No. 1 or related circuit malfunction
- MAF sensor or related circuit malfunction
- A/F sensor or related circuit malfunction
- HO2S or related circuit malfunction
- Compression-Low compression
- Restriction in intake/exhaust system
Grayish white with all plugs:
- ECT sensor No. 1 or related circuit malfunction
- MAF sensor or related circuit malfunction
- A/F sensor or related circuit malfunction
- HO2S or related circuit malfunction
- Air/fuel mixture-Too lean, insufficient fuel line pressure
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.
- Highly pressurized fuel may spray out if the fuel line is cut. Due to the following dangers occurring with a fuel spray, always complete the "Fuel Line Safety Procedure" to prevent the fuel from spraying. (See BEFORE SERVICE PRECAUTION
.)
- Fuel may cause irritation if it comes in contact with skin and eyes.
- If fuel ignites and causes a fire, it may lead to serious injury or death, and damage to property and facilities.
- Fuel is highly flammable and dangerous. Fuel line spills and leakage can cause serious injury or death, and damage to equipment. Always refer to the "Quick Release Connector Removal/Installation (fuel system)" before performing the fuel hose installation, and execute the "Fuel Leakage Inspection" after installation. (See QUICK RELEASE CONNECTOR REMOVAL/INSTALLATION
.) (See AFTER SERVICE PRECAUTION
.)
CAUTION:
- Disconnecting/connecting the quick release connector without cleaning it may cause damage to the fuel pipe and the quick release connector. Always clean the quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign material.
|