While most engines have the same number of spark plugs and cylinders, some four-cylinder blocks have two plugs for each cylinder. Here's why.

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While standard receptacles typically use three wires -- hot, neutral and ground -- you'll occasionally find 2-prong outlets in older homes. Since this type of outlet lacks a ground connection, the ...

Ignition coils last far longer than spark plugs and only need replacement when symptoms appear. Here’s how to tell if coils ...