Jim, is it possible "MoJo" refers to a thing and not a person.
You know, I took my "MoJo" into the shop yesterday, and today I have gotten my "MoJo" working.
In this case "Mojo" could be a 1984 Cadillac Sedan De Ville, or a Sony Play Station.
Of course "MoJo" could have been the mechanics name, or the tech at Best Buy, or could have indeed been of friend of Walterson's that needed a ride to work.