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You can Xeno's Paradox it all you like; the internal combustion engine still consumes oxygen and produces carbon monoxide. That will kill you within an enclosed environment.
Link to TRS threads in project mode here.
{nods} I suppose if you assume it's airtight, but it's an actual thing where people have tried to commit suicide that way (with all of its plausible deniability) and instead just woken up with a nasty headache and a car out of gas. Of course, the film might have had the bad guy specifically modify the car to emit more carbon monoxide...
Enclosed area has always been less effective than a hose from the tailpipe. https://www.ncbi.nlm.nih.gov/m/pubmed/16310328/
Showing less effective methods of suicide is an aversion of Television Is Trying To Kill Us.
Link to TRS threads in project mode here.
Technology Marches On is quite frankly a mess of a trope needing TRS. It can't decide whether it is about shows not keeping up with contemporary technology, or shows with gadgets that look aged now but were in line when they aired (and presumably when they were set). Maybe Artistic License Automobiles would fit.
Stories don't tell us monsters exist; we knew that already. They show us that monsters can be trademarked and milked for years.
Nthing the fact that running an engine in a closed garage is still a terrible idea with a modern engine; even a small sustained exposure over an extended period will slowly kill you. It's a property of Carbon Monoxide, really- Hemoglobin likes CO better than O2 and won't let go of it. It takes days to clear out of your system so it can easily build up to lethal levels over time. The effects are sort of like altitude sickness; except that the oxygen is there, there's just nothing to carry it in your bloodstream.
In Haunter, one of the plot points involves carbon monoxide poisoning from a car running in a closed garage. I was going to comment on how the scene set in 2014, with a modern car, is unlikely since emissions standards have changed such that cars don't emit that level of carbon monoxide anymore. Technology Marches On seems like a decent match (possibly even noting that it might be a matter of Edgar, the possessing ghost not having kept up with the changes in technology, but the trope does seem to be more about "Wow, that sounded cutting edge... ten years ago."