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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > General E90 Sedan / E91 Wagon / E92 Coupe / E93 Cabrio > WTF. Chewbacca sound from coolant tank



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      12-20-2016, 05:51 PM   #1
3.1L Z
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WTF. Chewbacca sound from coolant tank

Here's the video. Can u hear it?
I've done the bleeding procedure three times.

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      12-21-2016, 10:55 AM   #2
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Someone recently had a video of the same noise. Interesting. I can't remember the user, nor if they found a solution.
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      12-21-2016, 11:00 AM   #3
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We just bled ours yesterday. Didn't make that sound.
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      12-21-2016, 11:09 AM   #4
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http://www.e90post.com/forums/showthread.php?t=1326129

here is the thread, I thought it was more recent.
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      12-21-2016, 07:15 PM   #5
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Thanks. Exactly the same as mine..
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      12-21-2016, 09:10 PM   #6
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Quote:
Originally Posted by Mr. Tasty View Post
Someone recently had a video of the same noise. Interesting. I can't remember the user, nor if they found a solution.
That would be me. Yet to find the solution. Someone said boost solenoid going but haven't had the chance to look into it. Another person recommended opening the oil cap but that did nothing. Please let me know if you find the solution. (BTW it does sound just like chewbacca haha perfect description)
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      12-21-2016, 09:25 PM   #7
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Misses Han.
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      12-22-2016, 03:32 AM   #8
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Does it change when you rev the engine?
Pressure converter aka boost solenoid. Put the camera closer to it and see.
Easy DIY to replace if it is. If you have an N54 you have two, N55 has one.
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      12-22-2016, 04:15 AM   #9
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Quote:
Originally Posted by maddmatth View Post
Does it change when you rev the engine?
Pressure converter aka boost solenoid. Put the camera closer to it and see.
Easy DIY to replace if it is. If you have an N54 you have two, N55 has one.
I have the same problem. Don't notice a change when revving. Happens once the engine warms up a little. Doesn't happen upon cold start. Only notice it at idle. 3.1 L Z please confirm this is the same as you
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      12-23-2016, 11:31 PM   #10
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Quote:
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I have the same problem. Don't notice a change when revving. Happens once the engine warms up a little. Doesn't happen upon cold start. Only notice it at idle. 3.1 L Z please confirm this is the same as you
Happens when warm. Not on cold starts. I'll need to check on the reving. I'll see if I can pin point the noise if it's solenoid or the coolant tank. I'll do that tomorrow.
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      12-23-2016, 11:35 PM   #11
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100% boost solenoids making that sound. Next time you hear that sound, unplug them and the noise should stop. I replaced mine with brand new ones and occasionally they still make that moaning and sometimes ticking sound at idle. Only ever happens after driving the car for a long time. No idea what the cause is...
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      12-23-2016, 11:45 PM   #12
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Originally Posted by siphor1989 View Post
100% boost solenoids making that sound. Next time you hear that sound, unplug them and the noise should stop. I replaced mine with brand new ones and occasionally they still make that moaning and sometimes ticking sound at idle. Only ever happens after driving the car for a long time. No idea what the cause is...
Thanks for solving the problem. I'll have them replaced asap. Can't stand the noise anymore.
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      01-09-2017, 02:27 AM   #13
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Replaced boost solenoids last week and have yet to hear this dreadful sound again. Props to Siphor1989 for assuring me they were the problem. $80 a piece not bad. Hope you get yours replaced as well!
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      02-17-2017, 12:10 AM   #14
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Quote:
Originally Posted by SeanCon View Post
Replaced boost solenoids last week and have yet to hear this dreadful sound again. Props to Siphor1989 for assuring me they were the problem. $80 a piece not bad. Hope you get yours replaced as well!
Oh boy... just heard Chewie come back from the dead. Replaced my boost solenoids too so idk if that was the problem all along.... will keep you updated.
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