Spark Plug Inspection - Honda Civic 2002-2003 Service Manual

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Spark Plug Inspection
1. Inspect the electrodes and ceramic insulator.
Burned or worn electrodes may be caused by:
• Advanced ignition timing
Loose spark plug
Plug heat range too hot
Insufficient cooling
Fouled plug may be caused by:
Retarded ignition timing
Oil in combustion chamber
Incorrect spark plug gap
Plug heat range too cold
Excessive idling/low speed running
Clogged air cleaner element
Deteriorated ignition coils
Worn or deformed
electrodes
Damaged
gasket
'==-~~~_
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=
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Cracked
insulator
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• Improper gap
L .
Oil-fouling
I
0 •
Carbon deposits
• Cracked center
electrode insulator
2. Do not adjust the gap of iridium tip plugs (A);
replace the spark plug if the gap is out of
specification.
Electrode Gap:
Standard (New):
Service Limit:
1.0-1.1 mm
(0.039-0.043 in.)
1.3 mm (0.051 in. I
A
,
3. Replace the plug at the specified interval, or if the
center electrode is rounded (A). Use only the spark
plugs listed below .
Spark Plugs: IZFR6Kll (NGK)
SKJ20DR-Mll (DEN SO)
4. Apply a small quantity of anti-seize compound to
the plug threads, and screw the plugs into the
cylinder head finger-tight. Then torque them to
18 N·m (1.8 kgf.m, 13Ibf·ft).
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