HELP! Hissing Engine Sound (2008 328i)

F32Gyal · 12-08-2012, 03:46 AM

Okay here it goes,

My car has been making this hissing type sound that I can't get rid of. I have only had the local BMW dealership service my car, but ever time I take it in (4 times for the noise) I get the same answer, "we can't replicate the issue"

.

I have had to suggest that they look into my lifters and the vanos solenoids (thank you e90post for the tips

) both of which did need to be fixed, but unfortunately, that didn't make the noise go away

I am tired of paying the diagnostic fee for the same damn issue and am hoping that someone knows about this.

My Car
2008 328i
54K Miles
CPO
Purchased 3 years ago

Car at idle

GMWNashville · 12-08-2012, 06:07 AM

Loosen the oil cap with the engine running-don't open it all the way just loosen it and crack it open a hair-see if the noise changes.

Darius · 12-08-2012, 09:17 AM

What about alternator belt tensioner or pulley? Or it's not the exact sound but maybe it's just comming- loose drive chain? It might just need tensioners to be adjusted.

F32Gyal · 12-08-2012, 07:47 PM

Quote:

Originally Posted by volkswackin

Loosen the oil cap with the engine running-don't open it all the way just loosen it and crack it open a hair-see if the noise changes.

Ok, Ill try this. What would it mean if the noise does change?

F32Gyal · 12-08-2012, 07:52 PM

Quote:

Originally Posted by Darius

What about alternator belt tensioner or pulley? Or it's not the exact sound but maybe it's just comming- loose drive chain? It might just need tensioners to be adjusted.

I did have one bad pulley but that was replaced on my third visit. According to the checklist all of my belts are in the "green"

F32Gyal · 12-10-2012, 10:06 AM

Any other suggestions?

MrQuickR1 · 12-10-2012, 12:25 PM

This is with air condition/heat/defroster off right? I kind of get something similar. Never bothered to dig deep into it as nothing seems out of the ordinary

F32Gyal · 12-10-2012, 06:52 PM

Quote:

Originally Posted by MrQuickR1

This is with air condition/heat/defroster off right? I kind of get something similar. Never bothered to dig deep into it as nothing seems out of the ordinary

Yep, no AC, heat, or defroster on. The car doesn't run as smooth as it used 2 it starts up kind of rough

F32Gyal · 12-12-2012, 08:15 AM

Back to BMW I go

Car started to sputter & acted like it was going to cut off

RequestTheOverhead · 12-12-2012, 10:54 AM

Sounds like it might be a vac leak based in the shuddering and rough starts. I would try replacing the all the vac lines on top of the engine and see if that fixes it.

F32Gyal · 12-15-2012, 08:40 PM

Quote:

Originally Posted by RequestTheOverhead

Sounds like it might be a vac leak based in the shuddering and rough starts. I would try replacing the all the vac lines on top of the engine and see if that fixes it.

Thank you! I have an appointment in 2 weeks so Ill have them take a look at it.

12-08-2012, 03:46 AM	#1
F32Gyal New Member 1 Rep 18 Posts Drives: Black Sapphire F32 Join Date: Sep 2011 Location: Dallas iTrader: (0)	HELP! Hissing Engine Sound (2008 328i) Okay here it goes, My car has been making this hissing type sound that I can't get rid of. I have only had the local BMW dealership service my car, but ever time I take it in (4 times for the noise) I get the same answer, "we can't replicate the issue" . I have had to suggest that they look into my lifters and the vanos solenoids (thank you e90post for the tips ) both of which did need to be fixed, but unfortunately, that didn't make the noise go away I am tired of paying the diagnostic fee for the same damn issue and am hoping that someone knows about this. My Car 2008 328i 54K Miles CPO Purchased 3 years ago Car at idle Last edited by F32Gyal; 12-09-2012 at 06:26 AM.. Reason: Title Change
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12-08-2012, 06:07 AM	#2
GMWNashville Colonel 172 Rep 2,373 Posts Drives: 19 G05, 16 F80, 10 E70x5D Join Date: Jan 2008 Location: Nashville, TN iTrader: (2)	Loosen the oil cap with the engine running-don't open it all the way just loosen it and crack it open a hair-see if the noise changes.
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12-08-2012, 09:17 AM	#3
Darius New Member 0 Rep 16 Posts Drives: E90 Join Date: Apr 2009 Location: Lithuania iTrader: (0)	What about alternator belt tensioner or pulley? Or it's not the exact sound but maybe it's just comming- loose drive chain? It might just need tensioners to be adjusted.
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12-10-2012, 10:06 AM	#6
F32Gyal New Member 1 Rep 18 Posts Drives: Black Sapphire F32 Join Date: Sep 2011 Location: Dallas iTrader: (0)	Any other suggestions?
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12-10-2012, 12:25 PM	#7
MrQuickR1 Second Lieutenant 41 Rep 284 Posts Drives: 2011 328i Join Date: Jan 2012 Location: NJ iTrader: (0)	This is with air condition/heat/defroster off right? I kind of get something similar. Never bothered to dig deep into it as nothing seems out of the ordinary
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12-12-2012, 08:15 AM	#9
F32Gyal New Member 1 Rep 18 Posts Drives: Black Sapphire F32 Join Date: Sep 2011 Location: Dallas iTrader: (0)	Back to BMW I go Car started to sputter & acted like it was going to cut off
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12-12-2012, 10:54 AM	#10
RequestTheOverhead Going Mach Chicken 4 Rep 92 Posts Drives: e90 pre-LCI 335 Join Date: Jun 2012 Location: Denver, CO iTrader: (1) Garage List '98 Honda Superhawk ... [0.00] 2007 BMW 335xi [8.00]	Sounds like it might be a vac leak based in the shuddering and rough starts. I would try replacing the all the vac lines on top of the engine and see if that fixes it. __________________ '07 335xi, Alpine White \| Cold, "Sport", and Luxury packages \| Tinted \| OEM Black Lines \| JB4 \| DCI \| ER FMIC \| Forge DV's \| Custom exhaust with secondary cat delete, Magnaflow mufflers, black Dimisa Tips \| Staggered 18" V718's, Matte Black \| Flappy Paddles \| Titanium CF Trim Wrap \| BMW Performance Shifter and E-Brake Handle \|
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