Mr. Tact wrote on Oct 11, 2012, 17:22: Is this still true for a modern vehicle with a functioning exhaust system? I seem to remember reading a critic of a movie or tv show about someone doing this and how it wasn't valid any longer.
Even if ALL of the carbon monoxide is prevented (which its not) from a modern cat, you still have the issue of a combustion engine burning... oxygen. You can suffocate even if you don't get poisoned. My guess is it would be more painful and take longer. But I'm not going to test it.
Hmmm, you could be right. I don't know about your garage buy mine is nowhere close to air tight. I wouldn't be surprised either way -- it might depend on how air tight the garage is and if you are propped up in the car or laying on the floor of the garage.