Prelude L4-2.3L DOHC (16 Valve) (1996)
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Spark Plug: Testing and Inspection
Spark Plug Inspection
1. Inspect the Electrodes and Ceramic Insulator for:
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Worn or deformed Electrodes.
Improper Gap.
Oil Fouling.
Carbon Deposits.
Cracked Center Electrode Insulator.
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Damaged Gasket.
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Cracked Insulator.
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. F22A1 / H23A1 Engine: Adjust the gap with a suitable gapping tool, and replace the Plug if the Center Electrode is rounded.