So I really hate the default starter sound, so I made a start and loop file as the wiki said, but now I am stuck as to where I should put these files in the mod. The wiki doesn't provide enough information. Can someone please help?
I believe you have to put them into [your mod folder]/art/sounds/starter I could be wrong but I think that is how it works. You could look at the 2015/2019 Ford Mustang mod, as I know for certain that this has new working starter sounds
You need to define the starter location, but usually it'll be found in as @Inn0centJok3r said, [your mod folder]/art/sounds/starter or [your mod folder]/art/sounds/engine_starter, you may need to make those folders. The information in the wiki shows that you need to add information into the "mainEngine" section of your car's engine.jbeam There is detailed information here; https://wiki.beamng.com/Sound#Starter_Sounds
Indeed, take a look at Default beam engines, they will have the starter sound values in them. Just put the name of your sound into the starter sound line and you’ll be good to go they are very much possible
That comment is referring to proper sounds, we use a fairly complicated setup in fmod with start and stop samples and a looping region inbetween. Something that can't be replicated with just a single sound file.