Does anyone get a ticking noise from one exhaust when idling cold on their 335i?

Alext · 01-16-2011, 06:12 AM

I seem to be getting a metallic tinkling noise on cold starts from the left pipe on my e89 35i. It goes away completely when the car is warmed up. I don't think it's a leak because the sound disappears also when any sort of throttle is applied when parked. Anything to be concerned about?

NB: this isnt coming from the engine, only the left exhaust once the flap opens in the right side exhaust pipe.

etiliko · 01-16-2011, 06:32 AM

Uhm, yes, I seem to has it also.

Alext · 01-16-2011, 06:46 AM

etiliko: does it disappear once the car is warmed up fully too? If so then I am relieved

etiliko · 01-16-2011, 07:07 AM

I have to check better

**335i** · 01-16-2011, 07:42 AM

maybe sometimes didnt noticed very careful...need double check if u post video would be better

etiliko · 01-16-2011, 01:21 PM

I can confirm, thiking sound that came from driver's side only when cold

Alext · 01-16-2011, 04:53 PM

Thanks for checking, i think it is normal.

omerthe1st · 01-16-2011, 05:23 PM

It should be normal

Alext · 01-17-2011, 01:40 AM

I wonder what causes it?

kushtrim · 01-17-2011, 06:46 AM

I had that , took it to BMW and they replaced the exhaust .

Alext · 01-17-2011, 04:51 PM

Did they say what caused it?

Juiced46 · 01-17-2011, 05:41 PM

You need a new driver side muffler. Its the flap inside the muffler causing the rattle. They are known to fail and rattle, its very very common.

Alext · 01-17-2011, 06:09 PM

thx for the reply. The flap is on the right side of the exhaust on my car (e89)...so I don;t think it would make the sound from the left.

Juiced46 · 01-17-2011, 06:13 PM

Ohh my bad! Didnt realize you had an E89. Thought this was a 335, I skipped right over that part.

Forcefed3 · 01-17-2011, 06:52 PM

That's wastegate rattle and yes I sometimes get it.

Alext · 01-17-2011, 08:04 PM

Yeah I thought about that but it comes from the muffler area not the engine and not as RPM comes down, only at cold idle, slightest touch of throttle and its gone.

Forcefed3 · 01-17-2011, 08:56 PM

Quote:

Originally Posted by Alext

Yeah I thought about that but it comes from the muffler area not the engine and not as RPM comes down, only at cold idle, slightest touch of throttle and its gone.

Muffler area? It is most likely coming from the turbo - downpipe connection; thats where wastegate rattle occurs. Maybe you have an exhaust leak?

bigdaddycane · 01-17-2011, 09:31 PM

I'm getting rattling in my 335 from the driver's side muffler when it's slightly warmed up at idle. I have the golf tee mod done, but that shouldn't cause a rattle. Was there before I did the golf tee mod. Is it worth taking to the dealer? Off course I can take the golf tee mod out beforehand.

Alext · 01-17-2011, 10:47 PM

Well thanks for the input but I doubt its the wastegate rattle. Car is brand new 2011 model with <1000 miles for starters and its more like a ticking than a rattle. I will have a check for leaks, but seems strange it dissapears with any minor throttle.

Alext · 01-18-2011, 03:48 AM

Ok i put the car on ramps and checked underneath. I found the cause. It is the actual sheet metal of the muffler belly that is resonating at a specific frequency (RPM) at idle. I discovered it ONLY happens when the air con is on. It lessens as the muffler material warms up hence why after a drive it totally disappears.

When I place my hands on the underside of the muffler and apply pressure it absorbs the resonance and the noise ceases.

There is nothing I can really do about and it isnt any cause for concern in any case. I can see though that the stock system does appear to have some restrictive bends along its length.

BoostedE90 · 01-18-2011, 08:25 AM

I have it as well but it goes away after the car revs down after being started. I have the golf tee mod as well, but I highly doubt that is the cause. And like Alext said it's a ticking not a rattle. It's been there since I bought the car and I've reported it to the dealership everytime I bring it in for service and each dealership (I have used two different dealerships for service) say that it is normal.

Alext · 01-18-2011, 04:43 PM

Your car's got character

01-16-2011, 06:12 AM	#1
Alext Banned 138 Rep 2,042 Posts Drives: B M W Join Date: Apr 2008 Location: Everest iTrader: (2)	Does anyone get a ticking noise from one exhaust when idling cold on their 335i? I seem to be getting a metallic tinkling noise on cold starts from the left pipe on my e89 35i. It goes away completely when the car is warmed up. I don't think it's a leak because the sound disappears also when any sort of throttle is applied when parked. Anything to be concerned about? NB: this isnt coming from the engine, only the left exhaust once the flap opens in the right side exhaust pipe. Last edited by Alext; 01-16-2011 at 06:18 AM..
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01-16-2011, 06:32 AM	#2
etiliko Enlisted Member 0 Rep 34 Posts Drives: 335i coupè Join Date: Jan 2011 Location: Italy iTrader: (0)	Uhm, yes, I seem to has it also.
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01-16-2011, 06:46 AM	#3
Alext Banned 138 Rep 2,042 Posts Drives: B M W Join Date: Apr 2008 Location: Everest iTrader: (2)	etiliko: does it disappear once the car is warmed up fully too? If so then I am relieved
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01-16-2011, 07:07 AM	#4
etiliko Enlisted Member 0 Rep 34 Posts Drives: 335i coupè Join Date: Jan 2011 Location: Italy iTrader: (0)	I have to check better
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01-16-2011, 07:42 AM	#5
335i Colonel 184 Rep 2,320 Posts Drives: TOYOTA & 2008 E92 335i 6MT Join Date: Jul 2007 Location: Swiss iTrader: (4) Garage List 2008 335i [9.00]	maybe sometimes didnt noticed very careful...need double check if u post video would be better __________________ E92 335i Black Saphire 6MT PROcede V5, BMS DCI, Big Tom IC, AR CL-DP's 3", AR Design OC, Forge DV's, OEM M3 side skirts, BMW Performance Wheels 19 inch 269 Black Gloss+Continental ContiSportContact 5P (400hp and 550nm) https://www.youtube.com/user/aistis7..._as=subscriber
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01-16-2011, 01:21 PM	#6
etiliko Enlisted Member 0 Rep 34 Posts Drives: 335i coupè Join Date: Jan 2011 Location: Italy iTrader: (0)	I can confirm, thiking sound that came from driver's side only when cold
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01-16-2011, 04:53 PM	#7
Alext Banned 138 Rep 2,042 Posts Drives: B M W Join Date: Apr 2008 Location: Everest iTrader: (2)	Thanks for checking, i think it is normal.
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01-16-2011, 05:23 PM	#8
omerthe1st Enlisted Member 0 Rep 32 Posts Drives: BMW 335i Join Date: Jan 2011 Location: LA iTrader: (0)	It should be normal
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01-17-2011, 01:40 AM	#9
Alext Banned 138 Rep 2,042 Posts Drives: B M W Join Date: Apr 2008 Location: Everest iTrader: (2)	I wonder what causes it?
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01-17-2011, 06:46 AM	#10
kushtrim Major 176 Rep 1,301 Posts Drives: AW 528 xdrive (AW 335i coupe s Join Date: Dec 2008 Location: bronx N.Y iTrader: (3) Garage List 2008 335i coupe [10.00]	I had that , took it to BMW and they replaced the exhaust . __________________ M-tech front and rear bumpers /M3 style side skirts/gloss black painted roof/ black window trim/Matt black grill/35%tints/4"dimisaTips/CF splitters/M3 style trunk spoiler/VMR V70s/JB4/BMS dci/AMS FMIC/H&R sport with BMW performance shocks. Thanx Sal and he's crew@AutoCoutureMotoring
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01-17-2011, 04:51 PM	#11
Alext Banned 138 Rep 2,042 Posts Drives: B M W Join Date: Apr 2008 Location: Everest iTrader: (2)	Did they say what caused it?
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01-17-2011, 05:41 PM	#12
Juiced46 Major 74 Rep 1,035 Posts Drives: 03 Turbo Cobra, 2011 335xi Join Date: Jun 2010 Location: Wallingford CT iTrader: (3)	You need a new driver side muffler. Its the flap inside the muffler causing the rattle. They are known to fail and rattle, its very very common.
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01-17-2011, 06:09 PM	#13
Alext Banned 138 Rep 2,042 Posts Drives: B M W Join Date: Apr 2008 Location: Everest iTrader: (2)	thx for the reply. The flap is on the right side of the exhaust on my car (e89)...so I don;t think it would make the sound from the left.
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01-17-2011, 06:13 PM	#14
Juiced46 Major 74 Rep 1,035 Posts Drives: 03 Turbo Cobra, 2011 335xi Join Date: Jun 2010 Location: Wallingford CT iTrader: (3)	Ohh my bad! Didnt realize you had an E89. Thought this was a 335, I skipped right over that part.
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01-17-2011, 06:52 PM	#15
Forcefed3 Banned 127 Rep 4,732 Posts Drives: 2008 335i Join Date: May 2010 Location: South iTrader: (2) Garage List 2008 335i [1.00]	That's wastegate rattle and yes I sometimes get it.
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01-17-2011, 08:04 PM	#16
Alext Banned 138 Rep 2,042 Posts Drives: B M W Join Date: Apr 2008 Location: Everest iTrader: (2)	Yeah I thought about that but it comes from the muffler area not the engine and not as RPM comes down, only at cold idle, slightest touch of throttle and its gone.
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01-17-2011, 09:31 PM	#18
bigdaddycane I even mod my cereal 246 Rep 3,441 Posts Drives: 11 ZCP DCT M3 14 328d 21 GT4 Join Date: Aug 2009 Location: Northern Va iTrader: (53) Garage List 2021 Porsche GT4 [0.00] 2014 BMW 328d Xdriv ... [0.00] 2011 BMW M3 [0.00]	I'm getting rattling in my 335 from the driver's side muffler when it's slightly warmed up at idle. I have the golf tee mod done, but that shouldn't cause a rattle. Was there before I did the golf tee mod. Is it worth taking to the dealer? Off course I can take the golf tee mod out beforehand. __________________ 2011 Mineral White M3 ZCP - Opticoat, Ventureshield, some CF, B&B exhaust, AFE Intake Vorsteiner VFF 101s Ohlins 2014 Mineral White 328d Xdrive Wagon - Opticoat, Ventureshield, B8s, H&R, Apex SM-10s Hawk Pads 2021 718 Cayman GT4 - Fire extinguiser
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01-17-2011, 10:47 PM	#19
Alext Banned 138 Rep 2,042 Posts Drives: B M W Join Date: Apr 2008 Location: Everest iTrader: (2)	Well thanks for the input but I doubt its the wastegate rattle. Car is brand new 2011 model with <1000 miles for starters and its more like a ticking than a rattle. I will have a check for leaks, but seems strange it dissapears with any minor throttle.
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01-18-2011, 03:48 AM	#20
Alext Banned 138 Rep 2,042 Posts Drives: B M W Join Date: Apr 2008 Location: Everest iTrader: (2)	Ok i put the car on ramps and checked underneath. I found the cause. It is the actual sheet metal of the muffler belly that is resonating at a specific frequency (RPM) at idle. I discovered it ONLY happens when the air con is on. It lessens as the muffler material warms up hence why after a drive it totally disappears. When I place my hands on the underside of the muffler and apply pressure it absorbs the resonance and the noise ceases. There is nothing I can really do about and it isnt any cause for concern in any case. I can see though that the stock system does appear to have some restrictive bends along its length.
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01-18-2011, 08:25 AM	#21
BoostedE90 Lieutenant Colonel 55 Rep 1,690 Posts Drives: e90 335i 6MT Join Date: Nov 2007 Location: Tampa/Gainesville, FL iTrader: (5)	I have it as well but it goes away after the car revs down after being started. I have the golf tee mod as well, but I highly doubt that is the cause. And like Alext said it's a ticking not a rattle. It's been there since I bought the car and I've reported it to the dealership everytime I bring it in for service and each dealership (I have used two different dealerships for service) say that it is normal. Last edited by BoostedE90; 01-18-2011 at 08:33 AM..
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01-18-2011, 04:43 PM	#22
Alext Banned 138 Rep 2,042 Posts Drives: B M W Join Date: Apr 2008 Location: Everest iTrader: (2)	Your car's got character
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