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2010 2011 BMW 5 Series Forum F10 BMW 5-Series (F10) Forums General 5-Series Sedan and Wagon (F10 / F11) Forum Weird digital chirping sound after starting car randomly
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      05-11-2024, 01:45 AM   #1
Schiltrom
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Weird digital chirping sound after starting car randomly

So just like in this video, I get this strange sound. It usually happens in the morning, but sometimes after getting out of the grocery store or something short like that. https://www.youtube.com/shorts/FOTbTSp7DcY

What the heck is it, am I screwed?
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      05-17-2024, 06:39 AM   #2
Vylcany
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Hello

I don't know for sure what your problem is but I've tried listening multiple times.

I noticed the idle goes down (at I'm guessing normal idle RPM, coming down from its "cold start" RPM) at the same time this sound appears.

Thus I feel like this is more of a valve closing or opening that's making this sound, maybe it's on its way out or maybe it needs lubrication it doesn't have, I'm not sure.

If it is a valve, I don't know your engine but it might be a secondary air pump, a idle valve or something

Good luck with it
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      05-17-2024, 06:28 PM   #3
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I noticed your foot is on brake pedal when starting the car. Will it do it if foot off the pedal? I am thinking brake booster or some kind of vacuum valve.
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