Harry Krause wrote:

Because the CO2 is very, very cold and spraying it down into that hot
engine will likely turn the engine into scrap in short order.

"Thanks for playing, and we do have some lovely
parting gifts for you........"

Sorry Harry, the CO2 will be a gas by the time you get it to the engine.
A CO2 extinguisher might work quite well. Or it might not, depending on
the reason for the engine running away.

Rick