To clarify, the noise was not the ramp, definitely the engine. And again, it ran for less than five seconds, and was not hot.
At this point, be conservative. Flatbed it to a mechanic. You still have a very good chance of driving it away after having it checked but you don't want to take the chance of making anything worse by starting the engine.
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1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor