What is spark

spark test

Glossary “spark test” Definition:
A quick check of the ignition system made by carefully placing a metal end of one of the spark plug wires close to the engine while cranking the engine to see if there is a spark gap and to determine its intensity.

spark plug fouling

Glossary “spark plug fouling” Definition:
An accumulation of deposits on the lower, exposed end of the spark plug that act as an electrical conductor, thereby creating a path for electricity to travel to ground, rather than jump across the electrode gap.

spark plug

Glossary “spark plug” Definition:
An ignition component threaded into the cylinder head that contains two electrodes extending into the cylinder that form a gap across which high-voltage electricity arcs to ignite the compressed A/F mixture.

spark knock

Glossary “spark knock” Definition:
Term used for detonation or ping. Secondary rapid burning of the A/F mixture in the combustion chamber causing a second flame front that collides with the first flame front and produces a engine knock.