Legend Coupe V6-2675cc 2.7L SOHC FI (1988)
Spark Plug: Testing and Inspection
Spark Plug Inspection
1. Inspect the electrodes and ceramic insulator for:
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Improper gap
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Oil-fouling
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Carbon deposits
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Cracked center electrode insulator
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Worn or deformed electrodes
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Damaged gasket
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Cracked insulator
Burned or worn electrodes may be caused by:
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Lean fuel mixture
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Advanced ignition timing
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Loose spark plug
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Plug heat range too high
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Insufficient cooling
Fouled plug may be caused by:
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Rich fuel mixture
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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 low
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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. Replace the plug if the center electrode is rounded as shown.
Spark Plug (for all normal driving):
BCPR6E-11 (NGK), Q20PR-U11 (ND)
BCPR6EY-N11 (NGK)
For hot climates or continuous high speed driving:
BCPR7E-11 (NGK), Q22PR-U11 (ND)
BCPR7EY-N11 (NGK)
For cold climates: