This question has an answer:
Why doesn't Doc use the DeLorean in order to escape from the Libyans?
It's a very specific answer covered in the movie, spoken by a main character.
I'd like to know why this question was closed? And if it was closed because the voters didn't know the answer (or didn't know an answer existed) then we need to do a little better policing this, because some good questions that obviously aren't widely understood run the risk of getting deleted and moved into the netherworld of later pages.