Uploaded May 2016 | Updated September 2026, 3 weeks ago

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Spark plugs may seem like basic components, but while their design has not changed dramatically since invented, they are still essential to the correct operation of even the most advanced petrol/gasoline engines.

Spark plugs can vary in construction, material, service life and heat range; thus it is vital for any technician to understand how these factors are related and how it effects engine performance.

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