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M2 Technical Topics > S55 Engine / Drivetrain / Exhaust / Bolt-ons / Tuning > Start up sound

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      11-04-2019, 06:42 PM   #1
Saintjah
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Start up sound

Just noticed an odd sound that I only hear on initial start up..... best way to describe it is if you threw a small pebble at a tin can. I hear 2 or 3 of these sounds and from there it sounds fine... any ideas?
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      11-04-2019, 09:33 PM   #2
Kelvin1000
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Mine does the same thing...
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      11-04-2019, 10:13 PM   #3
Thescout13
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It's the valves in the exhaust rattling. Did it on both of our F80s and does it on my F87 as well.
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      11-06-2019, 05:26 AM   #4
Kelvin1000
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Any way to prevent it from happening?
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      11-06-2019, 10:39 PM   #5
FSU_Logan
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Valves in the active exhaust.
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      11-07-2019, 09:52 AM   #6
chiefsubjugator
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So glad I'm not the only one who hears rocks when the car comes on 😂
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