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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Wierd "vacuum" sound after BOV DIY



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      07-13-2012, 11:36 AM   #1
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Wierd "vacuum" sound after BOV DIY

Hey guys,

I did the DIY "BOV" by unplugging the DV hose just to see what it would sound like. I only did the front one, and drove around a bit to hear it, then came home to plug it all back up. Now the issues begin. First, I noticed ALOT of oil had been spit out of the DV hose, probably just normal blow-by. The real issue is I now hear this wierd sound when I let off the throttle after boosting: it isn't a blow off sound, more like a sucking sound that is hard to describe. I honestly think it might be compressor surge

Then, I go to read codes, and I find 2 codes popped up: 2ABC and 3100. At this point I am extremely pissed off. My mods are JB4 and DCI, never been off map 1. I cleared the codes and drove hard for a little, they didn't come back, but the sound is still there. Here is a low quality phone video of the sound, that you can hear towards the end when letting off throttle. Please help!

http://s1241.photobucket.com/albums/...=VIDEO0007.mp4
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      07-13-2012, 11:37 AM   #2
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Sounds like a boost leak, check all the connections.
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      07-13-2012, 11:40 AM   #3
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I forgot to note the codes popped up after I switched into JB4 map 8, thinking with the turbos "off" I couldn't hear it. The noise didn't occur in this map. Also, the car seems to be holding boost fine, I think..
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      07-13-2012, 11:44 AM   #4
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If you have a small leak the the turbos will be able to hold the boost, you're just overworking them.
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      07-13-2012, 11:44 AM   #5
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I'm gonna pretend to be surprised that something went wrong with your "budget" DIY BOV
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      07-13-2012, 11:44 AM   #6
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Quote:
Originally Posted by Andrey@AutoCouture View Post
If you have a small leak the the turbos will be able to hold the boost, you're just overworking them.
What do you think I should be checking first?
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      07-13-2012, 11:45 AM   #7
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Quote:
Originally Posted by E90Company View Post
What do you think I should be checking first?
Whatever you were plugging-unplugging. DV connections especially.
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      07-13-2012, 11:49 AM   #8
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Quote:
Originally Posted by Andrey@AutoCouture View Post
Whatever you were plugging-unplugging. DV connections especially.
What should I be looking for specifically? I disconnected where the dv connects to the intake piping. Shouldn't that not affect it?
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      07-13-2012, 12:17 PM   #9
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I'm sorry, but how do you have almost 2,700 posts & not know more?
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      07-13-2012, 12:20 PM   #10
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Quote:
Originally Posted by benzy89 View Post
I'm sorry, but how do you have almost 2,700 posts & not know more?
What am I not knowing here? Boost leak codes never showed up, and the car seems to be holding boost. I just hear a different sound heard in the vid.
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      07-13-2012, 12:22 PM   #11
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That it was pretty stupid to unplug the OEM DVs..... Should've just bought a used CP + BOV if you wanted to change it that badly
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      07-13-2012, 12:24 PM   #12
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Quote:
Originally Posted by E90Company View Post
What am I not knowing here? Boost leak codes never showed up, and the car seems to be holding boost. I just hear a different sound heard in the vid.
What tune are you running? Do a datalog and pay close attention to your WGDC. If you have a boost leak the WGDCs willl be very "spikey" and constantly trending upward
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      07-13-2012, 12:27 PM   #13
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Quote:
Originally Posted by rader1 View Post
What tune are you running? Do a datalog and pay close attention to your WGDC. If you have a boost leak the WGDCs willl be very "spikey" and constantly trending upward
The JB4. I guess I am going to have to log it
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      07-13-2012, 12:51 PM   #14
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Does the video sound like I am leaking?
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      07-13-2012, 01:07 PM   #15
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Just go pull on the dv and make sure its well put in. It needs to br locked into place.
If it is, then just drive around and look for codes.
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      07-13-2012, 01:49 PM   #16
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Quote:
Originally Posted by E90Company View Post
Does the video sound like I am leaking?
To be honest, I can't really hear anything. It's supposed to make a "whoosh" sound. As long as the DV is secure in the CP and the intake is capped and nothing else is disturbed then you should be good. Make sure canclear on the JB4 is off so that if there is a boost leak then it will show up as a 30FF code.
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      07-13-2012, 02:04 PM   #17
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goin by the sounds of that vid, everything sounds normal. Do a vid of the hood opened and rev it up
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      07-13-2012, 04:00 PM   #18
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Verdict of the story:

Codes were thrown due to switching into map 8, which is known to throw these codes on a JB4.

All lines were tight etc, noise is still there but it's normal.

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