No.31 Spark Plug Condition: Notes

NO.31 SPARK PLUG CONDITION [BP, BP WITH TC] DESCRIPTION & POSSIBLE CAUSE

31	Spark plug condition
DESCRIPTION	Incorrect spark plug condition
POSSIBLE CAUSE	NOTE: Inspecting spark plugs condition can determine whether problem is related to a specific cylinder or possibly to all cylinders. Wet/carbon stuck on specific plug: Spark-Weak, not visible Air/fuel mixture-Excessive fuel injection volume Compression-No compression, low compression Faulty spark plug Grayish white with specific plug: Air/fuel mixture-Insufficient fuel injection volume Faulty spark plug Wet/carbon stuck on all plugs: Spark-Weak Air/fuel mixture-Too rich Compression-Low compression Clogging in intake/exhaust system Grayish white with all plugs: Air/fuel mixture-Too lean 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"l. (See BEFORE SERVICE PRECAUTION ) (See AFTER SERVICE PRECAUTION ) 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.

Spark plug condition

DESCRIPTION

Incorrect spark plug condition

POSSIBLE CAUSE

NOTE:

Inspecting spark plugs condition can determine whether problem is related to a specific cylinder or possibly to all cylinders.

Wet/carbon stuck on specific plug:

Spark-Weak, not visible
Air/fuel mixture-Excessive fuel injection volume
Compression-No compression, low compression
Faulty spark plug

Grayish white with specific plug:

Air/fuel mixture-Insufficient fuel injection volume
Faulty spark plug

Wet/carbon stuck on all plugs:

Spark-Weak
Air/fuel mixture-Too rich
Compression-Low compression
Clogging in intake/exhaust system

Grayish white with all plugs:

Air/fuel mixture-Too lean
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"l.
    (See BEFORE SERVICE PRECAUTION )
    
    (See AFTER SERVICE PRECAUTION )
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.