In the 1970’s and 1980’s there were several books the either had characters that did it or promoted it.
Why is there no cooking tray in my new car’s engine bay?
Is it dangerous? (It would be less physically dangerous if there was a specific spot for it.)
My wife’s family once baked potatoes in the engine compartment during a road trip, just to see if it would work. Enough fumes leaked out of the engine that everything tasted slightly of oil and exhaust. Car engines are much tighter now, but I’m sure you still get a similar effect.
I don’t really know, but I would assume that taste represents quite a bit of random poisonous stuff in your food. Probably if you do it a couple times, it’s fine, the human system can take a lot of abuse in short doses. But if you made a habit I think it would mess you up.