Civic Sedan L4-1.5L SOHC (16 valve) (1995)
Spark Plug: Testing and Inspection
Spark Plug Inspection
1. Inspect the electrodes and ceramic insulator for:
Burned or worn electrodes may be caused by:
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Advanced ignition timing
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Loose spark plug
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Plug heat range too low
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Insufficient cooling
Fouled plug may be caused by:
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Retarded ignition timing
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Oil in combustion chamber
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Incorrect spark plug gap
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Plug heat range too high
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Excessive idling/low speed running
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Clogged air cleaner element
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Deteriorated ignition coil or ignition wires
2. Adjust the gap with a suitable gapping tool.
3. Replace the plug if the center electrode is rounded as shown above.
NOTE: Do not use spark plugs other than recommended types. These plugs are a new type (ISO standard).
4. Screw the plugs into the cylinder head finger tight, then torque them to 18 N-m (1.8 kg-m, 13 lb-ft).
NOTE: Apply a small quantity of anti-seize compound to the plug threads before installing.