Rattle from exhaust valve on cold starts?

joq3 · 04-24-2017, 07:02 AM

Hi,

I have noticed a rattle on cold starts when I have my door open, it sounds really bad for about 10 seconds before revving down and the rattle is less noticable. When warm I haven't noticed this at all.
I have JB4 for my N20 and I have set it to leave the valve open at all times.

Is it possible to mod the valve (without removing it) to make it quiet. Like stuffing some dampening on the rattling part?

Any ideas?

I want to be able to control it with my JB4 and I don't want the Golf Tee mod.

KGB_123_99 · 04-24-2017, 09:30 AM

There's really no way to stop the rattle short of welding the valve open or doing something similar.

If you say you can control it with JB4, can't you just leave it open?

joq3 · 04-25-2017, 12:37 AM

Quote:

Originally Posted by KGB_123_99

There's really no way to stop the rattle short of welding the valve open or doing something similar.

If you say you can control it with JB4, can't you just leave it open?

I have left it open in the JB4 settings. Which doesn't make a difference to the rattling. I'm thinking there's something (like a sprint/washer) that's rattling.
Any ideas on how to fix it?

KGB_123_99 · 04-25-2017, 06:49 AM

Quote:

Originally Posted by joq3

Quote:

Originally Posted by KGB_123_99

There's really no way to stop the rattle short of welding the valve open or doing something similar.

If you say you can control it with JB4, can't you just leave it open?

I have left it open in the JB4 settings. Which doesn't make a difference to the rattling. I'm thinking there's something (like a sprint/washer) that's rattling.
Any ideas on how to fix it?

Unfortunately I don't know but maybe someone else will chime in. Mine rattles on every cold start for about 30s but I learned to live with it.

Blubaron79 · 04-25-2017, 06:54 AM

My E92 N54 used to do it. I just got used to it..

CQVD330 · 04-25-2017, 11:34 AM

I had similar case and went to the dealer to have them look at this.
Ended up that the valve was deffective so they tried to fix it. Could not do it so they changed the complete muffler. Mind you, the car was under 80K kms and it was covered by the warranty.

STR8-6IX · 04-25-2017, 12:01 PM

honestly if you have it always open I would just remove it.

DrifterX · 04-25-2017, 12:08 PM

I noticed a rattle on my car on a cold start recently as well (in cooler weather), it'd go away once I heard the valve. Reading this thread, I guess the valve is initially closed then opens - for some reason I thought it was opposite.

Went in for an oil change last Friday and they told me it was normal... what exactly is rattling? The flap?

STR8-6IX · 04-26-2017, 10:15 AM

Quote:

Originally Posted by DrifterX

I noticed a rattle on my car on a cold start recently as well (in cooler weather), it'd go away once I heard the valve. Reading this thread, I guess the valve is initially closed then opens - for some reason I thought it was opposite.

Went in for an oil change last Friday and they told me it was normal... what exactly is rattling? The flap?

I swear I might have seen you or a car with your exact colour spec on bathurst street in richmond hill like 2 years ago or something

the colour really stands out.

mad props on the RWD 6MT spec. but I really hope you have some super dark window tints.

DrifterX · 04-26-2017, 03:23 PM

Quote:

Originally Posted by STR8-6IX

I swear I might have seen you or a car with your exact colour spec on bathurst street in richmond hill like 2 years ago or something

the colour really stands out.

mad props on the RWD 6MT spec. but I really hope you have some super dark window tints.

Thanks! I work at Markham/Richmond Hill border so maybe you did, although I only got my car early last year lol.

I didn't get a super dark tint, it's just right

saintpatty · 04-26-2017, 09:52 PM

Quote:

Originally Posted by DrifterX

I noticed a rattle on my car on a cold start recently as well (in cooler weather), it'd go away once I heard the valve. Reading this thread, I guess the valve is initially closed then opens - for some reason I thought it was opposite.

Went in for an oil change last Friday and they told me it was normal... what exactly is rattling? The flap?

I've seen this mentioned several times on this site in regards to valve position on cold starts and I'm unsure where this notion started. Why do people think something is happening with the valve on cold starts?

xantdieselx · 04-27-2017, 04:45 PM

I have an M235i and had the same exhaust valve. There is is a TSB for it and the dealer replaced it under warranty. I gotta think there is a TSB out there for the F30.

BEM-S4 · 04-27-2017, 04:47 PM

Quote:

Originally Posted by xantdieselx

I have an M235i and had the same exhaust valve. There is is a TSB for it and the dealer replaced it under warranty. I gotta think there is a TSB out there for the F30.

Mine was replaced too took 15 mins

MG 228i · 04-27-2017, 06:03 PM

Quote:

Originally Posted by xantdieselx

I have an M235i and had the same exhaust valve. There is is a TSB for it and the dealer replaced it under warranty. I gotta think there is a TSB out there for the F30.

I wonder if they'll replace a M235i MPE on my 228.
The issue is not related to the car, but you know how that goes.

xantdieselx · 04-29-2017, 02:50 PM

Quote:

Originally Posted by BEM-S4

Quote:

Originally Posted by xantdieselx

I have an M235i and had the same exhaust valve. There is is a TSB for it and the dealer replaced it under warranty. I gotta think there is a TSB out there for the F30.

Mine was replaced too took 15 mins

Same here they changed it out when I took it for an oil change.

xantdieselx · 04-29-2017, 02:51 PM

Quote:

Originally Posted by MG 228i

Quote:

Originally Posted by xantdieselx

I have an M235i and had the same exhaust valve. There is is a TSB for it and the dealer replaced it under warranty. I gotta think there is a TSB out there for the F30.

I wonder if they'll replace a M235i MPE on my 228.
The issue is not related to the car, but you know how that goes.

It was just the valve that was replaced. On the 2 you can replace just the valve it might be different on the F30.

04-24-2017, 07:02 AM	#1
joq3 Second Lieutenant 105 Rep 265 Posts Drives: BMW 328i F30 M/T -13 Join Date: Jan 2016 Location: Sweden iTrader: (0)	Rattle from exhaust valve on cold starts? Hi, I have noticed a rattle on cold starts when I have my door open, it sounds really bad for about 10 seconds before revving down and the rattle is less noticable. When warm I haven't noticed this at all. I have JB4 for my N20 and I have set it to leave the valve open at all times. Is it possible to mod the valve (without removing it) to make it quiet. Like stuffing some dampening on the rattling part? Any ideas? I want to be able to control it with my JB4 and I don't want the Golf Tee mod.
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04-24-2017, 09:30 AM	#2
KGB_123_99 Captain 404 Rep 962 Posts Drives: '17 330ix M-Sport, '09 528ix Join Date: Apr 2014 Location: Montreal, QC iTrader: (0)	There's really no way to stop the rattle short of welding the valve open or doing something similar. If you say you can control it with JB4, can't you just leave it open?
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04-25-2017, 06:54 AM	#5
Blubaron79 Brigadier General 1432 Rep 4,724 Posts Drives: 2021 M340i xDrive Join Date: May 2009 Location: PA iTrader: (0)	My E92 N54 used to do it. I just got used to it.. __________________ Current: 2021 M340i xDrive Previous: '18 340i xDrive; '15 335 xDrive; '14 435i xDrive; '09 335 E92 xDrive
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04-25-2017, 11:34 AM	#6
CQVD330 Second Lieutenant 52 Rep 284 Posts Drives: 2017 340i MPPSK Join Date: May 2008 Location: Blainville iTrader: (2) Garage List 2017 BMW 340i x-Dri ... [0.00]	I had similar case and went to the dealer to have them look at this. Ended up that the valve was deffective so they tried to fix it. Could not do it so they changed the complete muffler. Mind you, the car was under 80K kms and it was covered by the warranty. __________________ 2017 340i LCI //Glacier Silver Metallic //xDrive//MPPSK//Premium Package//M sport brakes //Vossen 20" CV7//6 MT//Performance front spoiler//Performance side blades//Performance diffuser//Performance trunk spoiler//Tinted//Coded//Painted reflectors//Matte black 340i badge//Powder coated MPPSK tips
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04-25-2017, 12:01 PM	#7
STR8-6IX Banned 536 Rep 2,825 Posts Drives: RWD 528i N52 Join Date: Nov 2016 Location: Toronto iTrader: (0)	honestly if you have it always open I would just remove it.
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04-25-2017, 12:08 PM	#8
DrifterX Major 514 Rep 1,055 Posts Drives: 2016 340i M Sport 6MT+RWD Join Date: Sep 2014 Location: Toronto, Ontario iTrader: (1) Garage List 2017 Hyundai IONIQ ... [0.00] 2016 BMW 340i M Sport [0.00]	I noticed a rattle on my car on a cold start recently as well (in cooler weather), it'd go away once I heard the valve. Reading this thread, I guess the valve is initially closed then opens - for some reason I thought it was opposite. Went in for an oil change last Friday and they told me it was normal... what exactly is rattling? The flap? __________________ 2016 Estoril Blue II 340i M Sport \| ///MPPSK \| 6MT \| RWD \| Fully Loaded BM3 Stage 2+ 93 \| B58TU HPFP \| VRSF v2 Catted Downpipe \| 550i Clutch
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04-27-2017, 04:45 PM	#12
xantdieselx Kingslayer 411 Rep 1,479 Posts Drives: 23' M3 Base Join Date: Jun 2008 Location: SWFL iTrader: (0)	I have an M235i and had the same exhaust valve. There is is a TSB for it and the dealer replaced it under warranty. I gotta think there is a TSB out there for the F30. __________________ Previous Cars: 2008' 135i, 2010' 328i, 2013' 328i, 2016' M235i, 2017' X1, 2019' M240i Current Cars: 2019' X3, 2021' M3 Comp
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