When did Delphi/GM start using MEFI6 in its 5.7L engines? My neighbor has a 2007 Mastercraft with the Indmar 5.7L MPI engine. Diacom readings show a bad Oxygen sensor. When looking for a new sensor in the online parts houses, there are 2 different O2 sensors. One for most Indmar 5.7L engines and one for engines with the MEFI6 controller. I don't know enough about the history of MEFI 3, 4, 5 & 6 to know which one is on this engine. Any help would be appreciated.
Kelvin