92-95 M/L, S/T, C/K and G fuel systems (with CPI) and 1996 to present M/L, S/T, C/K, and G Fuel systems with SCPI. Used to clean all GM fuel injectors except multec top feed injectors. Use only with GM approved top engine cleaner only. Adapter set GM-44466 is also required for the above vehicles. See GM service bulletin #"s 00-06-003 and 99-06-01-022 issued January00. These bulletins address a fuel injector poppet sticking problem which results in poor drivability and even no-start conditions. The tool and adapter set will effectively clean the injectors to permit proper function.