slight whistle noise letting off gas

creaminz · 06-14-2010, 01:46 PM

Okay, at high speed 60~80mph once I give a very light throttle and let go off the gas little bit(not completely, still pressing about 1/4), I hear this whistling/hissing nosie from the engine bay. I have never heard this before, I checked the engine bay nothing seems to loose. Recently I got my hpfp replaced, added P3Cars Vent boost gauge, and Quaife LSD installed...not sure if any of them caused this whistling/hissing noise.

onefastman · 06-14-2010, 01:55 PM

I had that the other day but only when it was raining...

I thought it was the siren from the turbos but idk

creaminz · 06-14-2010, 04:56 PM

Anyone??

onefastman · 06-14-2010, 06:06 PM

Im waiting too, is it constant for you?

matrix76 · 06-14-2010, 06:15 PM

Well, they say if you don't keep your butt so tight the whistling sound form the gas wont be as loud.

, , Just kidding guy's, like that was too easy, , ,

creaminz · 06-14-2010, 07:00 PM

Quote:

Originally Posted by onefastman

Im waiting too, is it constant for you?

ye I can duplicate it. I'm starting to think that it might be coming from the boost gauge wires, I read somewhere in the instruction, that wires has to be not touching one another or else it will make some sort of a noise. or...intercooler piping could be loose...I will check on that once I get home.
I don't think it has to do with the Quaife LSD I just got installed. hmmmm

mkiv · 06-14-2010, 08:15 PM

i have this when i installed my dps...

creaminz · 06-14-2010, 11:11 PM

I had dp on for awhile but this noise just came up. It doesn't happen when accelerating, only when slowly letting off the gas...hmmm

AKbmw · 06-18-2010, 04:21 AM

Quote:

Originally Posted by creaminz

I had dp on for awhile but this noise just came up. It doesn't happen when accelerating, only when slowly letting off the gas...hmmm

this happened on my old 335 but hopefully its not the same problem. do you have a BOV installed? or did you play with that little nipple sticking out of the manifold? problem with mine was when i was installing the BOV i guess i cracked that nipple which is a vaccume line i think and caused that noise when i let off the gas. however, this was at any speed not just 60 - 80. good luck hopefully its not that nipple since you have to replace the whole manifold plastic to fix it.

creaminz · 06-18-2010, 01:52 PM

Nipple........mmmm...oh wait what!?

you got me too excited

I will look at it once I get the car back. Thanks!

Trojan4evr · 06-18-2010, 08:07 PM

If it was the wires from teh boost guage, it would be because the current in one wire makes enough electromagnetic force around that can induce a new current in any other wire close to it which would also introduce noise, but I don't know how much current is in those wires and aslo doubt this would be the cause.try keeping the wires seperated or insulated some how.

06-14-2010, 01:46 PM	#1
creaminz Major General 556 Rep 7,704 Posts Drives: E90 LCI Join Date: Sep 2005 Location: So. Cal iTrader: (33)	slight whistle noise letting off gas Okay, at high speed 60~80mph once I give a very light throttle and let go off the gas little bit(not completely, still pressing about 1/4), I hear this whistling/hissing nosie from the engine bay. I have never heard this before, I checked the engine bay nothing seems to loose. Recently I got my hpfp replaced, added P3Cars Vent boost gauge, and Quaife LSD installed...not sure if any of them caused this whistling/hissing noise. Last edited by creaminz; 06-14-2010 at 02:01 PM..
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06-14-2010, 01:55 PM	#2
onefastman Major General 163 Rep 5,689 Posts Drives: 2009 135i 2011 e92m dct Join Date: Sep 2009 Location: Earth iTrader: (15)	I had that the other day but only when it was raining... I thought it was the siren from the turbos but idk __________________ Legal Disclaimer: Anything I or anyone else says about my vehicle on this website(1addicts.com or any affiliated or nonaffiliated sites), pertaining to modifications, is only to gain acceptance from my/our peers, and does not actually represent anything actually existing on my car, and thus, cannot be held against me in any issues, i.e. warranty claims, that may arise.
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06-14-2010, 04:56 PM	#3
creaminz Major General 556 Rep 7,704 Posts Drives: E90 LCI Join Date: Sep 2005 Location: So. Cal iTrader: (33)	Anyone??
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06-14-2010, 06:06 PM	#4
onefastman Major General 163 Rep 5,689 Posts Drives: 2009 135i 2011 e92m dct Join Date: Sep 2009 Location: Earth iTrader: (15)	Im waiting too, is it constant for you? __________________ Legal Disclaimer: Anything I or anyone else says about my vehicle on this website(1addicts.com or any affiliated or nonaffiliated sites), pertaining to modifications, is only to gain acceptance from my/our peers, and does not actually represent anything actually existing on my car, and thus, cannot be held against me in any issues, i.e. warranty claims, that may arise.
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06-14-2010, 06:15 PM	#5
matrix76 Major 63 Rep 1,300 Posts Drives: 2020 Z4 M40i Black/Red Join Date: Sep 2009 Location: Port Dover, Ontario iTrader: (1)	Well, they say if you don't keep your butt so tight the whistling sound form the gas wont be as loud. , , Just kidding guy's, like that was too easy, , , __________________ Brian Black Sapphire, Black w/Burrwood Trim & Shifter, 162's, Mtec H8 AE's, DS1 HID 6000K
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06-14-2010, 08:15 PM	#7
mkiv 2JZ 64 Rep 819 Posts Drives: 16 G500 Join Date: Nov 2008 Location: 温哥华Vancouver iTrader: (6)	i have this when i installed my dps...
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06-14-2010, 11:11 PM	#8
creaminz Major General 556 Rep 7,704 Posts Drives: E90 LCI Join Date: Sep 2005 Location: So. Cal iTrader: (33)	I had dp on for awhile but this noise just came up. It doesn't happen when accelerating, only when slowly letting off the gas...hmmm
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06-18-2010, 01:52 PM	#10
creaminz Major General 556 Rep 7,704 Posts Drives: E90 LCI Join Date: Sep 2005 Location: So. Cal iTrader: (33)	Nipple........mmmm...oh wait what!? you got me too excited I will look at it once I get the car back. Thanks!
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06-18-2010, 08:07 PM	#11
Trojan4evr Lieutenant Colonel 521 Rep 1,927 Posts Drives: 2021 G80 M3 Join Date: Oct 2009 Location: Socal iTrader: (0) Garage List 2011 BMW/ E82 135i [1.00] 2007 BMW/ E90 335i [5.50]	If it was the wires from teh boost guage, it would be because the current in one wire makes enough electromagnetic force around that can induce a new current in any other wire close to it which would also introduce noise, but I don't know how much current is in those wires and aslo doubt this would be the cause.try keeping the wires seperated or insulated some how. __________________ '21 G80 M3 '11 E82 135i DCT (Gone but not forgotten) '08 E90 335i (Gone but not forgotten)
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