Ford Mustang EFI System Tuning - Inside The Black Box Part 3 - Tech
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The only method for reprogramming Ford EEC IV processors is through the use of devices that plug into the J3 service port. When such a device is installed, the EEC looks to the programming on the external device and ignores its internal programming. J3 devices are typically chips, such as the ChipMaster Revolution (below left), but they can also be more elaborate devices such as the TwEECer (below right). A big advantage of J3 devices is the ability to load several different tunes, and switch between them on the fly. View Related Article
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