How do you remove computer on 89 E-350?

To remove the computer (ECM) from a 1989 Ford E-350, first disconnect the negative battery cable to ensure safety. Locate the computer, which is typically found under the dashboard on the driver's side or behind the kick panel. Unplug the wiring harness connectors and any mounting bolts or screws securing the computer in place. Finally, carefully pull the computer out of its housing.