Inspecting spark plugs. Discoloration means different things.
Cracked spark plug will cause misfire and an engine that idles rough.

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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1-31-11
want location of fuel filter on 2002 buick v-6 3800 model
Comments
That depends on what model Buick you are talking
about. It is either on the right or left side of the fuel tank.


Inspecting Spark Plugs for Cracks And Wear

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