No.29 Spark Plug Condition: Notes
CONDITION DESCRIPTION & POSSIBLE CAUSE
| 29 |
SPARK PLUG CONDITION |
| DESCRIPTION |
- Incorrect spark plug condition.
|
| POSSIBLE CAUSE |
NOTE:
- Inspecting the spark plug condition can determine whether problem is related to a specific cylinder 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
- Spark plug malfunction
Grayish white with specific plug:
- Air/fuel mixture-Insufficient fuel injection volume
- Spark plug malfunction
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 wiring harness malfunction
- MAF sensor or related wiring harness malfunction
- A/F sensor or related wiring harness malfunction
- HO2S sensor or related wiring harness malfunction
- Compression-Low compression
- Restriction in intake/exhaust system
Grayish white with all plugs:
- 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.
- 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 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 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.
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