Inspecting Spark Plugs for Cracks And Wear

This is a plug with 75,000 miles on it that is firing normally. No large deposits, not discolored . Reddish or green deposits would indicate burning coolant. Black, sooty deposits would indicate burning oil.

Inspecting spark plug

Also check for hairline cracks in the porcelain insulator (1).

Cracked spark plug will cause misfire code P0300 and an engine that idles rough



Question: want location of fuel filter on 2002 buick v-6 3800 model
 Answer: That depends on what model Buick you are talking about. It is either on the right or left side of the fuel tank.

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