A spark plug's function is to
Pick an answer
Correct!
Not quite. The correct answer is highlighted.
Correct answer to question 16 (Auto & Shop Information): ignite the compressed air and fuel mixture
Method
High voltage from the coil jumps the plug's gap, and that arc lights the compressed mixture at the moment the piston nears the top of its travel.
Updated: November 2026
Raise your AFQT scoreFree for iPhone and Android
