e92 rough idle as engine settles

bluekn8286 · 12-04-2012, 12:19 PM

When the car is initially started and just before the engine settles, I notice that the idle gets noticeably rougher and lumpy (it looks like it is jumping from 500 rpm to a little above it; around 800 to 900 rpm multiple times). I notice this mostly during cold starts in the morning and very very slightly during the day. I have been told this is normal, but I wanted to confirm. Otherwise, my car is throwing no check engine lights and it drives just fine.

Thanks everyone

bigjae1976 · 12-05-2012, 10:55 AM

I get this too...not sure if its normal.

ES_TRADER · 12-05-2012, 04:15 PM

I get this too sometimes. No codes either. When it does this motor feels like struggling so I just blip the throttle lightly a few times, give it some gas and it goes away. I have to do this on my 84 toy van. Seems to work.

I also get a pop sound in the exhaust from 1-2 shift when engine cold.

Totti · 12-05-2012, 04:38 PM

Me too - http://www.m3post.com/forums/showthread.php?t=770467

ES_TRADER · 12-05-2012, 05:22 PM

Quote:

Originally Posted by Totti

Me too - http://www.m3post.com/forums/showthread.php?t=770467

Mine has no issue cranking. Cranks fine but then rpm starts fluctuating a bit

bluekn8286 · 12-06-2012, 04:26 AM

Made a quick call to an SA and they mentioned that there is nothing to worry about as long as no significant codes are being thrown. I've tested it a few more times and its not consistent (as mentioned, it appears to be isolated to cold conditions). Given that the car drives fine, I don't have any issues cranking the motor, and I haven't experienced any loss of power, I am going to just enjoy the car. Of course, if anything new occurs, I'll take it to the dealership and update everyone as a result.

Thanks for the replies everyone

Sean05 · 12-16-2012, 12:30 PM

Not sure if anyone search but sooner or later it will throw a code might be in a week or months im sure its the low pressure sensor i would just wait until it shows up.. Just hope its not the ICV...

6spdg37s · 12-16-2012, 12:48 PM

seems like my brand new M does the same... I think it is just cold start mode

ms372 · 12-16-2012, 12:57 PM

car is warming up the cats on a cold start, my car did that and after i went full exhaust, i got a tune that removed the cold start. i have noticed that the car doesnt do it anymore after the tune.

mark896 · 12-16-2012, 08:53 PM

Yup, get cold start deleted via a tune and it will go away. Same happened to me and it's fixed.

sycd · 12-17-2012, 11:30 PM

Getting same thing here, noticing it more since I installed a much louder exhaust than stock. Otherwise the car runs fine.

12-04-2012, 12:19 PM	#1
bluekn8286 Private Drives: 2011 E92 BMW M3 ZCP DCT Join Date: Mar 2011 Location: San Jose, CA Posts: 57 iTrader: (0)	e92 rough idle as engine settles When the car is initially started and just before the engine settles, I notice that the idle gets noticeably rougher and lumpy (it looks like it is jumping from 500 rpm to a little above it; around 800 to 900 rpm multiple times). I notice this mostly during cold starts in the morning and very very slightly during the day. I have been told this is normal, but I wanted to confirm. Otherwise, my car is throwing no check engine lights and it drives just fine. Thanks everyone
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12-05-2012, 10:55 AM	#2
bigjae1976 Brigadier General Drives: 04 330Ci, 11 E90 M3 Individual Join Date: Mar 2006 Location: Milwaukee, WI Posts: 4,054 iTrader: (8)	I get this too...not sure if its normal. __________________

12-16-2012, 12:30 PM	#7
Sean05 Putcha ang ganda... Drives: 08 MR E92 M3 Join Date: Feb 2010 Location: Los Angeles, Brea CA. Posts: 4,984 iTrader: (9)	Not sure if anyone search but sooner or later it will throw a code might be in a week or months im sure its the low pressure sensor i would just wait until it shows up.. Just hope its not the ICV... __________________

12-16-2012, 12:57 PM	#9
ms372 Captain Drives: AW E92 m3 6MT Join Date: Mar 2012 Location: Montreal Posts: 692 iTrader: (0)	car is warming up the cats on a cold start, my car did that and after i went full exhaust, i got a tune that removed the cold start. i have noticed that the car doesnt do it anymore after the tune. __________________ ESS V2 Tune \| Challenge sport x-pipe \| --- \| Dinan Intake \| Evosport pulley\| Vorsteiner \| Downforce USA \| Gintani \| UUC \| BMW Performance \| Macht Schnell

12-17-2012, 11:30 PM	#11
sycd First Lieutenant Drives: 2012 M3 ZCP DCT Join Date: Mar 2008 Location: USA Posts: 396 iTrader: (0) Garage List 2013 BMW X5 xDrive50i [0.00] 2012 BMW M3 [E92] [0.00]	Getting same thing here, noticing it more since I installed a much louder exhaust than stock. Otherwise the car runs fine. __________________ 2013 Mini Cooper S Hardtop \| Kite Blue \| 6spd Manual \| Factory JCW Exterior Pkg 2013 X5 xDrive50i \| Carbon Black \| M Sport + M Perf, 333M Wheels Sold: 2012 E92 M3 \| Jet Black, Fox Red/Black \| DCT, ZCP

12-05-2012, 04:15 PM	#3
ES_TRADER Colonel Drives: 328i, 335i, M3, 535i, X5, 36M Join Date: Oct 2010 Location: OC Posts: 2,369 iTrader: (3) Garage List 2012 328i E92 [5.00] 2013 X5 [0.00] 2013 335i F30 [0.00] 1990 Toyota Previa [0.00] 1997 E36 M3 [5.00] 2011 E92 M3 [0.00] 2011 535i [0.00]	I get this too sometimes. No codes either. When it does this motor feels like struggling so I just blip the throttle lightly a few times, give it some gas and it goes away. I have to do this on my 84 toy van. Seems to work. I also get a pop sound in the exhaust from 1-2 shift when engine cold.

12-06-2012, 04:26 AM	#6
bluekn8286 Private Drives: 2011 E92 BMW M3 ZCP DCT Join Date: Mar 2011 Location: San Jose, CA Posts: 57 iTrader: (0)	Made a quick call to an SA and they mentioned that there is nothing to worry about as long as no significant codes are being thrown. I've tested it a few more times and its not consistent (as mentioned, it appears to be isolated to cold conditions). Given that the car drives fine, I don't have any issues cranking the motor, and I haven't experienced any loss of power, I am going to just enjoy the car. Of course, if anything new occurs, I'll take it to the dealership and update everyone as a result. Thanks for the replies everyone

12-16-2012, 12:48 PM	#8
6spdg37s Captain Drives: none Join Date: Aug 2012 Location: dirty jerz Posts: 738 iTrader: (2)	seems like my brand new M does the same... I think it is just cold start mode

12-16-2012, 08:53 PM	#10
mark896 Warrant Officer Drives: 2011.5 E92 M3 Join Date: Dec 2011 Location: Alabama Posts: 434 iTrader: (0)	Yup, get cold start deleted via a tune and it will go away. Same happened to me and it's fixed.

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