What Is A SPARKPLUG And How Does It Work?
A sparkplug is a device that provides a fixed air gap for an electrical current to jump across, in order to create an electrical spark.
It is this spark which ignites the air/fuel mixture that has been injected into the combustion chamber.
And it is the energy from this mini-explosion that creates the power stroke (pushes the piston down), powering the vehicle.
Sparkplugs can get fouled (dirty) from various conditions:
When a sparkplug gets dirty, it becomes ineffective (won't produce a hot enough spark to effectively and efficiently ignite the air-fuel mixture in the combustion chamber).
This results in reduced fuel economy and poor power.
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