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      11-13-2017, 09:43 AM   #1
shark715
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X5 50i Loud Noise Upon Cold Start

I've started to hear a loud noise every time I start my cold engine that sounds like the pressure being released from a large truck with air brakes.

Only happens with a cold engine.

Any ideas what this might be?

Thanks in advance for your help.
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      11-14-2017, 09:09 AM   #2
JoeyBimX5din
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video?
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      11-16-2017, 09:39 PM   #3
Ryan5034
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Definitely post a video. I wonder if it's some sort of vacuum leak.
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      11-17-2017, 08:01 AM   #4
godmans
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I have that on/off too and found it more common during colder outside temps.

If it is consistent for you, pls post a vid
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      11-17-2017, 09:40 AM   #5
JoeyBimX5din
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These could be two different sounds from two different failures.
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2011 BMX X5 Xdrive50i - 127K - No muffler, BMS Stage 1
2005 Jeep Grand Cherokee 5.7L V8-Her stock DD
1995 Ford Thunderbird 4.6 V8 LX - A bunch of mods BMW guys don't care about
1995 BMW 540i6 - H&R Lowering Springs, Bilstein's, Racing Dynamics Bars, Catback, Short shifter
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      11-20-2017, 07:41 AM   #6
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Mine's done it twice in a month, more like a half-second loud screech/chirp (similar to OP description), if I had to guess I'd say starter...
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