spark plug
sparking plug BrE

Besides, I think that spark plug has become fouled with oil, and will have to be changed to get the best results.

Ignition in the combustion chamber is either by hot tube or spark plug.

A split single has two cylinders but only one combustion chamber and spark plug.

Costs are further reduced because all cylinders at each end of the engine share a common fuel injector and/or spark plug.

There were two sparking plugs per cylinder and twin magnetos.

He tapped the rusty sparking plugs and squeezed valve springs in the palm of his hand.

Opening the bonnet to see how much damage had been done, I found that three of the four sparking plugs had been taken out.

But it is much more useful to explain it in terms of interactions between pistons, cylinders and sparking plugs.

Early magnetos had one coil, with the contact breaker (sparking plug) inside the combustion chamber.

He turned to his driver and in careful German said, 'Petrol, sparking plugs, bath, food, sleep.