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Capacitance inside the EFI computer can retain the settings, and there might even be an EPROM that it loads from during initial "boot". To dump the capacitance and be certain it is reset, hold the power lead to the ground lead for a few seconds (while it is NOT connected to the battery or anything!). This drains any capacitance that could make the thing hold onto codes. This is a great way to reset modules that have onboard coding (EPROM) that loads a factory default instruction list when connected.
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