My IMS went, how do I know if the engine is toast?

THANKS,
I HAVE A 2001 BOXTER AND THE ISB WENT OUT..IT QUIT AND I COASTED TO A PARKING LOT TURNING IT OFF VERY QUICKLY..IT WOULD NOT START BUT WOULD CRANK ..IT JUMPED TIME...IS THERE A WAY TO KNOW IF THE ENGINE IS TOAST.SHOULD I BUY THE NEW BEARING AND TAKE A CHANCE .BUY A SALVAGE ENGINE REBUILD OR PART THE CAR OUT..THANKS BERNIE..58,000 MILES..

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[Nick at Pelican Parts]

This is an interference engine (valves will hit pistons) you may have gotten lucky. First pull the spark plugs and try cranking the engine by hand turning the crankshaft bolt. If you don't feel any thing hit then do a compression test of each cylinder.

- Nick