Living Under the Hood: Sparking a Debate on Spark Plug Replacement -
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Living Under the Hood: Sparking a Debate on Spark Plug Replacement

Replacing spark plugs became even more complex when we discovered that a careless installation can cause the new spark plug to misfire and the dreaded bright-orange Malfunction Indicator Light (MIL) to come on.

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photo 1: modern engines require modern tools for spark plug 
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