What was the car Homer Simpson built?

Answer 1

In a Treehouse of Horror, Homer travels back in time via a toaster. he kills a mosquito, and when he comes back to his time, that mosquito he killed ruined the time space continuim and Ned Flanders became overlord of the Earth. Homer travels back in time over and over again, each time doing something wrong. eventually, he settles on having a world where people have long stretchy tounges, but everything else is normal.

Answer 2

In Simpsons Hit and Run (the videogame) the car is listed as "car built for Homer"

In the episode, 'Oh Brother Where Art Thou?', Homer tracks down his half brother, Herbert Powell, (voice of Danny DeVito), owner of Powell Motors in Detroit. Herbert is so taken with some of Homer's everyman sensibilities that he authorizes Homer free reign of Powell Motors design department to design a car that 'everyman' would buy. True to himself, Homer designs an outrageous car with huge tail fins, a bubble dome, and horns that play 'La Cucaracha'. The result of Herbert's faith in Homer's abilities brings the company to bankruptcy. This episode, number 28, first aired February 21, 1991.

In the episode, 'Saturdays of Thunder', Homer decides he needs to be a better parent to Bart. He discovers that Bart is trying to build a car in order to enter the soap box derby. Of course, Homer ends up building the whole thing himself and the car turns out about as well as the spice rack he made for Marge. This episode is number 44 and first aired November 14, 1991.