Diagnostic ignition spark detector

A diagnostic ignition spark detector in an internal combustion engine comprising a spark plug, hollow means for spacedly enveloping said spark plug, an upper hollow member, said means depending from said upper member, upper and lower partial walls on said upper member, a cap extending upwardly from said lower wall, a sleeve extending upwardly from said lower wall adjacent said cap, a sleeve depending from said upper wall, an elongated heated screw frictionally disposed in said depending sleeve, the head of said screw extending above said sleeve and the lower end extending below said sleeve, a metal cap frictionally encompassing the head of said screw, a portion of said screw extending below said sleeve, an expanded metal coiled spring surrounding said spark plug with the lower end grounded on the metal portion of said plug, the upper end of said spring being bent at right angles and frictionally seated in said upstanding sleeve, the free end of said upper end of said spring being bent at right angles, flattened and positioned directly below the lower end of said screw, and a viewing window in said upper hollow member.