NO.29 SPARK PLUG CONDITION
29 SPARK PLUG CONDITION
DESCRIPTION
Incorrect spark plug condition
POSSIBLE
CAUSE
NOTE:
• Inspecting the spark plugs condition can determine whether the problem is related to
a specific spark plug or possibly all spark plugs.
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 is stuck on all plugs:
• Spark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 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 manual.
(See BEFORE REPAIR PROCEDURE .)
(w) RX8-Engine Troubleshooting
Page 143
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