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Hi Mike,
in general: if the engine turns over but doesn't start because you don't have ignitions sparks i would check the hall sensors, hall sensor connectors and hall sensor wiring first. Also the DME has an engine speed sensor. To translate that from Porsche workshop manual terms to normal terms check the crankshaft and camshaft position sensors, connectors and wirings.
If the DME doesn't know the exact position of the camshaft / crankshaft in general it would try to start in a limp mode, but maybe the 5.2 with the mods doesn't.
My car has the DME 7.8, so there might be differences. When i try to start the car without a transponder the engine doesn't turn over at all.
Regards, Markus
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