Civic L4-1493cc 1.5L SOHC (VTEC) (1993)
Spark Plug: Testing and Inspection
Spark Plug Inspection
1. Inspect the electrodes and ceramic insulator for wear, overheating or fouling.
Overheated 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
Checking Spark Plug Electrode Gap
2. Adjust the gap to 1.0 - 1.1 mm (0.039 - 0.043 in) with a suitable gapping tool.
3. Replace the plug if it is fouled or worn.
4. Apply a small quantity of anti-seize compound to the plug threads.
5. Screw the plugs into the cylinder head finger-tight, then torque them to 18 Nm (13 ft.lb).