TL L5-2451cc 2.5L SOHC MFI (1997)
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 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. Check the electrode gap.
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Adjust the gap with a suitable gapping tool.
Electrode Gap
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Replace the plug if the center electrode is rounded as shown below:
Spark Plugs
BKR5E-N11 (NGK)
K16PR-L11 (Nippondenso)