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It depends on what car or engine you have to decide how many.

No diesels don't have spark plugs. Some have glow plugs. Not the same thing. Glow plugs are used to heat the cylinders. For quicker starting.

On certain old diesels, yes. For example the IH farm tractor model M diesel made in the 1940's started on gasoline (with spark plugs) and switched over to diesel when the engine was warm (spark plugs not used at this point).

That is true. But I didn't think about them. Most people today have never heard of a system like that. There was also engines with pony motors used to start the main engine. I learned the hard way. Not to stand in front of the arm. When you start the main. They can kick you.

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13y ago

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