Actually, if you run a modern engine in a closed garage now, your eyes won't burn, you won't choke and it won't kill you. While this is a stupid thing to do, t

Actually, if you run a modern engine in a closed garage now, your eyes won't burn, you won't choke and it won't kill you. While this is a stupid thing to do, the bad stuff is only coming out before it's warmed up (meaning closed loop and catalyst warm enough to function) and if you back your car into the garage you can tell the difference the first time you do a cold start.