A spark plug is the part that fires the mixture inside a petrol engine. Change the spark plugs.
It sparks across a gap thinner than a pound coin, thousands of times a minute. Reading a used spark plug tells a mechanic how the engine has been running.
1nounspark plugThe part that fires the mixture inside a petrol engine.
“One spark plug was fouled and the engine ran on three cylinders.”
spark plug is a part.
Practised in Vehicles & Machines