Before I try to get my car started again (last time it wouldn't shut off), I wanted to pick up something I can use to snuff the engine as a last resort. After pricing CO2 fire extinguishers (very spendy), I realized I could use welding gas -- the argon/CO2 mix is the cheapest and will easily do the job.

So what I'm wondering, is if I have to crack the cylinder and empty the whole thing to stop the engine, or if I can pick up a cheap regulator and air gun so I have some control over the process?

Has anybody tried either way?

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