Civic Coupe L4-1595cc 1.6L DOHC (VTEC) MFI (1999)
Spark Plug: Testing and 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 plugs 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. D16Y5, D16Y7, D16Y8 engine:
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Adjust the gap with a suitable gapping tool, and replace the plug if the center electrode is rounded as shown.