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Old 03-30-2010, 12:42 AM
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Hissing after shutdown

Picked up the M yesterday. Anyone notice a small "hissing" sound from the engine after shutdown? Not the same as a fan spinning (much quieter), was wondering if maybe some small circulation to make sure the turbos cool down properly?
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Old 03-30-2010, 06:20 PM
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waste gate depleting the last amount of compression? Listen to it while someone shuts your m off.
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Old 03-30-2010, 11:24 PM
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I think I have it too and I also think it's some kind of turbo pressure being released.
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Old 04-01-2010, 12:49 AM
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I was thinking that it might be some pump circulating fluid to keep the turbos cool after shutdown. I have heard stories of turbos overheating, etc. It stops after a while so I'm not super-concerned about it.
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