How do you reset the computer on a 1992 F150?

To reset the computer on a 1992 Ford F-150, disconnect the negative battery cable and leave it disconnected for about 10-15 minutes. This will clear any stored trouble codes and reset the engine control module (ECM). After the time has passed, reconnect the negative battery cable, and your computer will be reset. Make sure to check any radio presets or clock settings, as they will also be cleared.