This is a plug with 75,000 miles on it that is
firing normally. No large deposits, not
discolored . Reddish or green deposits
indicate burning coolant. Black, sooty
deposits indicate burning oil.
Also check for hairline cracks in the
porcelain insulator (1).
|Platinum / Iridium tip spark plug inspection
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Check engine light - Also known as the SERVICE ENGINE SOON or SES light. This
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want location of fuel filter on 2002 buick v-6 3800 model
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Inspecting Spark Plugs for Cracks And Wear