Gurgling, burbling N55 on deceleration

GB-335xiCoupe · 09-16-2014, 09:46 PM

When I'm decelerating, around 40mph and below, I can hear a hollow "burbling/gurgling" sound.

At first I was thinking maybe my tires were out of round, but then the noise would always be there.

Then I thought maybe the front control arms are loose, or bushings bad. But then that would also always be there...

Then I thought maybe wastegate rattle... but I've watched videos of that and a wg rattle is a lot louder and more raspy...

So I'm at a loss... it's too quiet to be picked up by my phone, otherwise I'd post a video. If I floor it and then let off the gas, it makes the noise, or when I'm just cruising a consistent speed and let off the gas or turn off the cruise control. It does it whether the engine is warm or cold... I can tell the frequency of it goes down as I decrease speed, until the rpms drop. Ideas?

Briancanadiano · 09-16-2014, 09:59 PM

Quote:

Originally Posted by GB-335xiCoupe

When I'm decelerating, around 40mph and below, I can hear a hollow "burbling/gurgling" sound.

At first I was thinking maybe my tires were out of round, but then the noise would always be there.

Then I thought maybe the front control arms are loose, or bushings bad. But then that would also always be there...

Then I thought maybe wastegate rattle... but I've watched videos of that and a wg rattle is a lot louder and more raspy...

So I'm at a loss... it's too quiet to be picked up by my phone, otherwise I'd post a video. If I floor it and then let off the gas, it makes the noise, or when I'm just cruising a consistent speed and let off the gas or turn off the cruise control. It does it whether the engine is warm or cold... I can tell the frequency of it goes down as I decrease speed, until the rpms drop. Ideas?

That is perfectly normal!! A great feature on all 335i's, if you have a pe exhaust it makes it even louder. Everybody usually loves that sound.

Evooooo · 09-16-2014, 09:59 PM

Are you catless? Maybe confusing it for the gurgle/backfire when load is being let off?

josega90 · 09-16-2014, 10:34 PM

i had this this issue as well and it threw a code. I don't remember the exact code number but after some research I found it was the "danger to manifold" code

Sidewinderpb · 09-16-2014, 11:15 PM

Quote:

Originally Posted by Evooooo

Are you catless? Maybe confusing it for the gurgle/backfire when load is being let off?

Google "backfire."

Quote:

Originally Posted by josega90

i had this this issue as well and it threw a code. I don't remember the exact code number but after some research I found it was the "danger to manifold" code

Yeah I'm not sure that you guys are on the same page. The gurgle is totally normal - in fact, desirable to most.

GB-335xiCoupe · 09-17-2014, 02:13 AM

This is not normal. It didn't always make this sound. The only mod is a Vishnu tune...
The sound is coming from the front, not the exhaust. It's almost like something is loose.

waldo2014 · 09-17-2014, 07:25 AM

Get a readout of the error codes that have been stored, this should help pinpoint the problem.

JETmn · 09-17-2014, 08:11 AM

Quote:

Originally Posted by Sidewinderpb

Yeah I'm not sure that you guys are on the same page. The gurgle is totally normal - in fact, desirable to most.

You didn't get it. It is a fast n furious reference to the green eclipse in the first one.

Sidewinderpb · 09-17-2014, 09:35 AM

Quote:

Originally Posted by JETmn

You didn't get it. It is a fast n furious reference to the green eclipse in the first one.

Ah. Well now I feel silly. Never got around to watching those movies.

335m · 09-17-2014, 09:49 AM

I do not think the terms you used were the best to describe your issue. As you are well aware most of the forum members wish to achieve a gurgle on their deceleration by adding a catless DP or exhaust.

Is the Vishnu disabling the exhaust flap? Or do you have the Golf Tee mod?

Does it occur only when the car is moving or are you able to rev up and let the revs drop and hear it?

josega90 · 09-17-2014, 10:14 AM

do you also have a "trolling" sound after the gurgling?

GB-335xiCoupe · 09-18-2014, 07:26 AM

I'm not trolling. I have more self respect than to do that.

I'm thinking it is my tires after all, but not sure yet. I'm going to rotate them this weekend and see if the sound changes. It occurs only when I'm moving, so it points more to a drive/suspension/tire issue.

If it's engine related, I'm thinking it would be referred to as more of a knock. But would a knock occur on deceleration? I wouldn't think so... and there are no codes being thrown.

mashimarho · 09-18-2014, 08:51 AM

Hmm.. Never heard of this issue. The only gurgling is from the exhaust that I know of.

GB-335xiCoupe · 09-23-2014, 03:31 AM

Well, after rotating my tires front to back, the sound is still there, but not as loud, and it has changed character. So I'm convinced it is the tires wear pattern, or a bent wheel.

josega90 · 09-23-2014, 07:55 AM

i guess your gurgling sound definition is different than ours lol. nonetheless that's good, sounds like tire wear. If you take the wheels to get balanced, they will be able to tell you if the tire is bad or the wheel is bent. My guess is tires also since bent wheels usually just cause vibrations, in my experiences

09-16-2014, 09:46 PM	#1
GB-335xiCoupe Libertarian 132 Rep 1,577 Posts Drives: 29k mi per year. Join Date: Sep 2013 Location: Green Bay area iTrader: (0)	Gurgling, burbling N55 on deceleration When I'm decelerating, around 40mph and below, I can hear a hollow "burbling/gurgling" sound. At first I was thinking maybe my tires were out of round, but then the noise would always be there. Then I thought maybe the front control arms are loose, or bushings bad. But then that would also always be there... Then I thought maybe wastegate rattle... but I've watched videos of that and a wg rattle is a lot louder and more raspy... So I'm at a loss... it's too quiet to be picked up by my phone, otherwise I'd post a video. If I floor it and then let off the gas, it makes the noise, or when I'm just cruising a consistent speed and let off the gas or turn off the cruise control. It does it whether the engine is warm or cold... I can tell the frequency of it goes down as I decrease speed, until the rpms drop. Ideas? __________________ 2011 335xi Coupe BSM (e92/N55/ZPP/ZCW, Alpina B3 Flash) Bought 08/09/2013@53,340mi Current 3/13/2019@206,283mi Fail(s): tstat hous/water pump 89k, Chargepipe 106k, coolant tank 114k, FRM3 114k Maint: Walnut blast 101k, Trans/T-case Fluid 103k, OFHG 195k
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09-16-2014, 09:59 PM	#3
Evooooo First Lieutenant 27 Rep 313 Posts Drives: 335 XI Sedan M Sport Join Date: Jul 2011 Location: Long Island iTrader: (1)	Are you catless? Maybe confusing it for the gurgle/backfire when load is being let off?
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09-16-2014, 10:34 PM	#4
josega90 Private 3 Rep 73 Posts Drives: 2011 335i Join Date: Jul 2014 Location: Miami, FL iTrader: (0)	i had this this issue as well and it threw a code. I don't remember the exact code number but after some research I found it was the "danger to manifold" code
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09-17-2014, 02:13 AM	#6
GB-335xiCoupe Libertarian 132 Rep 1,577 Posts Drives: 29k mi per year. Join Date: Sep 2013 Location: Green Bay area iTrader: (0)	This is not normal. It didn't always make this sound. The only mod is a Vishnu tune... The sound is coming from the front, not the exhaust. It's almost like something is loose.
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09-17-2014, 07:25 AM	#7
waldo2014 New Member 0 Rep 24 Posts Drives: E92-335iX Join Date: May 2014 Location: Europe iTrader: (0)	Get a readout of the error codes that have been stored, this should help pinpoint the problem.
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09-17-2014, 09:49 AM	#10
335m Major 123 Rep 1,166 Posts Drives: 08 e92 M3 Join Date: Jun 2014 Location: Austin Texas iTrader: (1)	I do not think the terms you used were the best to describe your issue. As you are well aware most of the forum members wish to achieve a gurgle on their deceleration by adding a catless DP or exhaust. Is the Vishnu disabling the exhaust flap? Or do you have the Golf Tee mod? Does it occur only when the car is moving or are you able to rev up and let the revs drop and hear it? __________________ 2008 e92 M3: Gintani Sport w/ Topspeed Catless X-Pipe, KW-V3
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09-17-2014, 10:14 AM	#11
josega90 Private 3 Rep 73 Posts Drives: 2011 335i Join Date: Jul 2014 Location: Miami, FL iTrader: (0)	do you also have a "trolling" sound after the gurgling?
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09-18-2014, 07:26 AM	#12
GB-335xiCoupe Libertarian 132 Rep 1,577 Posts Drives: 29k mi per year. Join Date: Sep 2013 Location: Green Bay area iTrader: (0)	I'm not trolling. I have more self respect than to do that. I'm thinking it is my tires after all, but not sure yet. I'm going to rotate them this weekend and see if the sound changes. It occurs only when I'm moving, so it points more to a drive/suspension/tire issue. If it's engine related, I'm thinking it would be referred to as more of a knock. But would a knock occur on deceleration? I wouldn't think so... and there are no codes being thrown.
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09-18-2014, 08:51 AM	#13
mashimarho BimmerPost Supporting Vendor 2111 Rep 13,877 Posts Drives: E92 M3 & F80 M3 & G82 M4 Join Date: Mar 2010 Location: Lynnwood, WA iTrader: (45) Garage List 2021 BMW G82 M4 [0.00] 2011 BMW E92 M3 [0.00] 2015 BMW F80 M3 [0.00] 2012 BMW 335i xDrive [9.78]	Hmm.. Never heard of this issue. The only gurgling is from the exhaust that I know of. __________________ Mashimarho.com /// Instagram /// Facebook /// Youtube /// sales@mashimarho.com /// (425) 582-7939
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09-23-2014, 03:31 AM	#14
GB-335xiCoupe Libertarian 132 Rep 1,577 Posts Drives: 29k mi per year. Join Date: Sep 2013 Location: Green Bay area iTrader: (0)	Well, after rotating my tires front to back, the sound is still there, but not as loud, and it has changed character. So I'm convinced it is the tires wear pattern, or a bent wheel. __________________ 2011 335xi Coupe BSM (e92/N55/ZPP/ZCW, Alpina B3 Flash) Bought 08/09/2013@53,340mi Current 3/13/2019@206,283mi Fail(s): tstat hous/water pump 89k, Chargepipe 106k, coolant tank 114k, FRM3 114k Maint: Walnut blast 101k, Trans/T-case Fluid 103k, OFHG 195k
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09-23-2014, 07:55 AM	#15
josega90 Private 3 Rep 73 Posts Drives: 2011 335i Join Date: Jul 2014 Location: Miami, FL iTrader: (0)	i guess your gurgling sound definition is different than ours lol. nonetheless that's good, sounds like tire wear. If you take the wheels to get balanced, they will be able to tell you if the tire is bad or the wheel is bent. My guess is tires also since bent wheels usually just cause vibrations, in my experiences
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