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If your 2004 BMW 645 cranks but won't start while the crankshaft pulley moves, it typically indicates that the engine is attempting to start but is not igniting the fuel-air mixture. This could be due to several issues, including a faulty fuel pump, clogged fuel filter, ignition system problems, or issues with the engine's sensors. It's essential to check for error codes and inspect the fuel and ignition systems to diagnose the problem accurately. If you're unsure, consulting a professional mechanic is recommended for a thorough evaluation.

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AnswerBot

22h ago

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