Wierd "vacuum" sound after BOV DIY - BMW 3-Series (E90 E92) Forum

E90Company · 07-13-2012, 11:36 AM

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

onebadmofo · 07-13-2012, 11:37 AM

Sounds like a boost leak, check all the connections.

E90Company · 07-13-2012, 11:40 AM

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..

onebadmofo · 07-13-2012, 11:44 AM

If you have a small leak the the turbos will be able to hold the boost, you're just overworking them.

benzy89 · 07-13-2012, 11:44 AM

I'm gonna pretend to be surprised that something went wrong with your "budget" DIY BOV

E90Company · 07-13-2012, 11:44 AM

Quote:

Originally Posted by Andrey@AutoCouture

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?

onebadmofo · 07-13-2012, 11:45 AM

Quote:

Originally Posted by E90Company

What do you think I should be checking first?

Whatever you were plugging-unplugging. DV connections especially.

E90Company · 07-13-2012, 11:49 AM

Quote:

Originally Posted by Andrey@AutoCouture

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?

benzy89 · 07-13-2012, 12:17 PM

I'm sorry, but how do you have almost 2,700 posts & not know more?

E90Company · 07-13-2012, 12:20 PM

Quote:

Originally Posted by benzy89

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.

benzy89 · 07-13-2012, 12:22 PM

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

rader1 · 07-13-2012, 12:24 PM

Quote:

Originally Posted by E90Company

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

E90Company · 07-13-2012, 12:27 PM

Quote:

Originally Posted by rader1

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

E90Company · 07-13-2012, 12:51 PM

Does the video sound like I am leaking?

Beemw335 · 07-13-2012, 01:07 PM

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.

rader1 · 07-13-2012, 01:49 PM

Quote:

Originally Posted by E90Company

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.

#Tee · 07-13-2012, 02:04 PM

goin by the sounds of that vid, everything sounds normal. Do a vid of the hood opened and rev it up

E90Company · 07-13-2012, 04:00 PM

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.

/thread

07-13-2012, 11:36 AM	#1
E90Company Major General Drives: 335i Join Date: Mar 2012 Location: SFL Posts: 5,690 iTrader: (2)	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 __________________ FBO N54 6AT
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07-13-2012, 11:37 AM	#2
onebadmofo BimmerPost Supporting Vendor Drives: 2007 E92 335i Join Date: Aug 2010 Location: Staten Island, NY Posts: 2,355 iTrader: (14)	Sounds like a boost leak, check all the connections. __________________ BMW coding/programming in the Tri-State area. \| call/text 347-560-3731

07-13-2012, 11:40 AM	#3
E90Company Major General Drives: 335i Join Date: Mar 2012 Location: SFL Posts: 5,690 iTrader: (2)	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.. __________________ FBO N54 6AT

07-13-2012, 11:44 AM	#4
onebadmofo BimmerPost Supporting Vendor Drives: 2007 E92 335i Join Date: Aug 2010 Location: Staten Island, NY Posts: 2,355 iTrader: (14)	If you have a small leak the the turbos will be able to hold the boost, you're just overworking them. __________________ BMW coding/programming in the Tri-State area. \| call/text 347-560-3731

07-13-2012, 12:51 PM	#14
E90Company Major General Drives: 335i Join Date: Mar 2012 Location: SFL Posts: 5,690 iTrader: (2)	Does the video sound like I am leaking? __________________ FBO N54 6AT

07-13-2012, 11:44 AM	#5
benzy89 Banned Drives: '08 E90 335i Join Date: Jan 2012 Location: Northern NJ Posts: 2,400 iTrader: (3) Garage List 2008 BMW 335i [3.75]	I'm gonna pretend to be surprised that something went wrong with your "budget" DIY BOV

07-13-2012, 12:17 PM	#9
benzy89 Banned Drives: '08 E90 335i Join Date: Jan 2012 Location: Northern NJ Posts: 2,400 iTrader: (3) Garage List 2008 BMW 335i [3.75]	I'm sorry, but how do you have almost 2,700 posts & not know more?

07-13-2012, 12:22 PM	#11
benzy89 Banned Drives: '08 E90 335i Join Date: Jan 2012 Location: Northern NJ Posts: 2,400 iTrader: (3) Garage List 2008 BMW 335i [3.75]	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

07-13-2012, 01:07 PM	#15
Beemw335 Lieutenant Colonel Drives: 335i Join Date: Mar 2011 Location: My car is my home Posts: 1,992 iTrader: (2)	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.

07-13-2012, 02:04 PM	#17
#Tee attention whore Drives: yes Join Date: Oct 2011 Location: Socal Posts: 3,069 iTrader: (0)	goin by the sounds of that vid, everything sounds normal. Do a vid of the hood opened and rev it up __________________ #teamstretchNpoke

07-13-2012, 04:00 PM	#18
E90Company Major General Drives: 335i Join Date: Mar 2012 Location: SFL Posts: 5,690 iTrader: (2)	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. /thread __________________ FBO N54 6AT

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