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      04-05-2024, 06:24 AM   #9
smokinu454
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Drives: 2016 535i
Join Date: Feb 2019
Location: KY

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Open the hood, remove the engine cover, start the engine, and see if you can hear it even faintly coming from the pcv in the valve cover. I had a b58 that sounded like this, wound up being a bad pcv diaphragm. Sadly if it’s bad on yours you’ll need to replace the entire valve cover. The b58 also had white smoke from the exhaust at idle with it.
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