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Subaru
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2003
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Impreza WRX, 4D Sedan, Standard
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Repair and Diagnosis
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Engine Performance
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Ignition System
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Ignition System - DOHC/TC
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Spark Plug
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Inspection
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Normal
Spark Plug: Inspection: Normal
Brown to grayish-tan deposits and slight electrode wear indicate correct spark plug heat range.
Fig 1: Identifying Spark Plug Condition (Normal)
Courtesy of SUBARU OF AMERICA, INC.