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Iridium spark plugs. | Chevy Cobalt Forum

Jan 27, 2008 ... Metals such as platinum, palladium and rhodium in the converter's .... The differing designations denote the engine power output, 170 hp, 200 hp and 240 hp. ... A high-end direct injection version of the 2.2 L Ecotec is available for: ... cylinder case, coil on plug ignition, 58x crankshaft position sensing and a ...