Question for humming noise after installed Eisenmann exhaust

tobypic · 02-12-2014, 02:09 AM

I had never heard humming/buzzing noise and now can hear electric noise (like wing~~~~) after I installed Esienmann Exhaust.

Does problem come from Exhaust? If so, do I need re-mapping on my engine?, or anyone knows what problem is exactly if its not from exhaust? Let me know, Thanks!

My car is 2011 e90 lci 335i black performance edition

------------------------UPDATED------------------------
I checked where whirring noise coming from; it was driver side front vent when engine is cold and warming up, and when on 5th gear. I went exhaust shop twice this week where I installed my Eisenmann and they recommend dealer for it because they thought its not from exhaust.

I visited the dealer for it yesterday and the problem was that vacuum line to muffler silencing flap left off after exhaust was installed. Also, noted that noise occurred at times when the muffler flap would activated. Inspected vacuum line and found left loose under the vehicle; blocked off vacuum line and found noise is no longer present.

CombatNinja · 02-12-2014, 07:39 AM

What did you do with the vacuum line that opens and closes the flapper on the stock exhaust? That is my first suspicion.

tobypic · 02-12-2014, 10:03 AM

I dont do anything. Eisenmann exhaust is my first mod.

Quote:

Originally Posted by CombatNinja

What did you do with the vacuum line that opens and closes the flapper on the stock exhaust? That is my first suspicion.

CombatNinja · 02-12-2014, 10:14 AM

Open your trunk and look to the left. Open the little door behind the taillight. Unplug the connector that is visible straight down in the hole. Do not unplug anything that is hooked to the lights. What you are seeking is a small black connector that controls the vacuum for the exhaust flap. See if that solves your issue. If not, I have no idea what is going on.

tobypic · 02-12-2014, 11:15 AM

Like this DIY?

:
http://www.e90post.com/forums/showthread.php?t=80661

Quote:

Originally Posted by CombatNinja

Open your trunk and look to the left. Open the little door behind the taillight. Unplug the connector that is visible straight down in the hole. Do not unplug anything that is hooked to the lights. What you are seeking is a small black connector that controls the vacuum for the exhaust flap. See if that solves your issue. If not, I have no idea what is going on.

CombatNinja · 02-12-2014, 12:20 PM

Yeah. I think you might be overthinking this. You could have done it six times in the time it took you to Google that.

tobypic · 02-18-2014, 02:10 PM

Quote:

Originally Posted by CombatNinja

Yeah. I think you might be overthinking this. You could have done it six times in the time it took you to Google that.

Thanks for helping me a lot, but i don't think exhaust problem. I googled it so much times and cant figure out. Also, i went exhaust shop to check and no problem with it. I checked how sound coming from; the whirring noise coming from driver side front vent when engine is cold and warming up and when on 5th gear. I just dropped my car at dealer today. I will update what problem it is after I will get answer from dealer. Again, thank you for helping me!

tobypic · 02-19-2014, 03:58 PM

UPDATED what was going on my exhaust.

02-12-2014, 02:09 AM	#1
tobypic Private First Class 12 Rep 160 Posts Drives: 2011 E90 LCI Join Date: Apr 2013 Location: Bay Area iTrader: (5)	Question for humming noise after installed Eisenmann exhaust I had never heard humming/buzzing noise and now can hear electric noise (like wing~~~~) after I installed Esienmann Exhaust. Does problem come from Exhaust? If so, do I need re-mapping on my engine?, or anyone knows what problem is exactly if its not from exhaust? Let me know, Thanks! My car is 2011 e90 lci 335i black performance edition ------------------------UPDATED------------------------ I checked where whirring noise coming from; it was driver side front vent when engine is cold and warming up, and when on 5th gear. I went exhaust shop twice this week where I installed my Eisenmann and they recommend dealer for it because they thought its not from exhaust. I visited the dealer for it yesterday and the problem was that vacuum line to muffler silencing flap left off after exhaust was installed. Also, noted that noise occurred at times when the muffler flap would activated. Inspected vacuum line and found left loose under the vehicle; blocked off vacuum line and found noise is no longer present. Last edited by tobypic; 02-19-2014 at 03:57 PM..
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02-12-2014, 07:39 AM	#2
CombatNinja Banned 51 Rep 1,556 Posts Drives: e91 328i, e90 328i, e90 335i Join Date: Feb 2011 Location: United States iTrader: (0)	What did you do with the vacuum line that opens and closes the flapper on the stock exhaust? That is my first suspicion.
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02-12-2014, 10:14 AM	#4
CombatNinja Banned 51 Rep 1,556 Posts Drives: e91 328i, e90 328i, e90 335i Join Date: Feb 2011 Location: United States iTrader: (0)	Open your trunk and look to the left. Open the little door behind the taillight. Unplug the connector that is visible straight down in the hole. Do not unplug anything that is hooked to the lights. What you are seeking is a small black connector that controls the vacuum for the exhaust flap. See if that solves your issue. If not, I have no idea what is going on.
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02-12-2014, 12:20 PM	#6
CombatNinja Banned 51 Rep 1,556 Posts Drives: e91 328i, e90 328i, e90 335i Join Date: Feb 2011 Location: United States iTrader: (0)	Yeah. I think you might be overthinking this. You could have done it six times in the time it took you to Google that.
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02-19-2014, 03:58 PM	#8
tobypic Private First Class 12 Rep 160 Posts Drives: 2011 E90 LCI Join Date: Apr 2013 Location: Bay Area iTrader: (5)	UPDATED what was going on my exhaust.
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