A »To diagnose a misfire using spark plug analysis, remove the spark plugs and inspect for signs like soot (rich mixture), white deposits (lean mixture), or oil residue (worn engine components). Compare each plug's condition; a single odd plug may point to a specific cylinder issue. Adjust fuel or repair engine components as needed. Regular inspection helps maintain engine performance and prevent future misfires.

A »To diagnose a misfire using spark plug analysis, inspect the spark plug's condition, color, and electrode wear. A fouled or worn-out plug indicates a misfire. Check for oil or fuel fouling, and compare the plug's condition to the manufacturer's specifications. A misfire can be caused by a faulty plug, ignition coil, or fuel system issue.