Chevrolet/General Motors Iridium Spark Plug 12637197 41-124 High Performance Ignition Efficiency Improvement

Chevrolet Cruze, Malibu and other GM post-2000 models can choose iridium spark plugs, OEM numbers 12637197 or 41-124. Installed in the cylinder head bore to ignite the air-fuel mixture, improving combustion efficiency and power. Replacement difficulty moderate; labor 0.5-1 hour. If rough idle, weak acceleration, or increased fuel consumption occur, electrode wear or carbon buildup is indicated and replacement is needed.