Crossword clues for the word: SPARKPLUG The word SPARKPLUG has appeared as an answer to at least 12 crossword clues on different crossword puzzles. Crossword clues for SPARKPLUG Showing 1 to 12 of 12 results Clue(s) Auto tune-up item Barney Google's horse Barney Google's hoss Barney Google's mount Car engine part Car part: 2 wds. Comic-strip horse Ignition system device Initiator of action It ignites quarrel and Grandad's in bits Tune-up item Tune-up supply