Hi, I'm in a bad spot. I bought a nice little speedboat that has a gen V mercruiser 454 and it came with a Fitech 600hp EFI . One of the previous owners swapped out the Rochester for this instead. The boat was running great until the handheld interface died. Then the new one was not compatible and messed up all the values so the engine doesn't start. I really need someone with the same type of set up to be kind enough to tell me the values on all parameters so I can at least have it running and tweak it afterwards. Thanks for your help

See if this helps you


don’t go too lean… 14.1 afr is a pretty normal baseline. I have a custom tuned gm ecm for my LS swap using HP tuners.