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Very good point. Mine was self inflicted. rofl That's also why I pulled back home in my deuce yesterday when I saw tons of smoke on decel. I knew I was likely dealing with turbo seals. 40-60psi of oil into the intake path = :shock:

There's two types of runaway. The ones mentioned where an alternative fuel source (oil leak into intake path, combustible gas entering intake path). Then there's likely what 3dAngus is thinking about. When a fuel rack sticks and the throttle stops responding. I've had a few VE pumps do this...

If it's a diesel, it can runaway. Well some of the new diesels have butterfly valves for emissions (EGR'ed trucks mainly), I'd assume there's some logic in the ECM that would close the valve in an overspeed situation. In the case of the CAT engine in your A3, it certainly can.