Slight Stutter / Rough Idle On Cold Start

963mw · 01-02-2018, 06:21 PM

Hey guys,

As the title states, there's something weird going on with my M2 (~850km). Whenever I cold start for the first 5-8 seconds, the car feels like it's stuttering; you can feel the engine shaking before it stabilizes and the cold start resumes as normal.

Is this normal? Its not that problematic, but I didn't have this problem at all on my 435i's N55.

Thanks in advance.

horsepower_and_hounds · 01-02-2018, 06:33 PM

Mine runs rough on and off a lot. Has 1600 miles and dealer says all is fine

emdeuce · 01-03-2018, 03:07 PM

Cold start changes the timing and cause it to be louder and feel a little rumblier. However, The rpms are suppose to stay up around/above 1k. Are your rpms dipping under?

963mw · 01-04-2018, 08:35 AM

Quote:

Originally Posted by Opplock1

Cold start changes the timing and cause it to be louder and feel a little rumblier. However, The rpms are suppose to stay up around/above 1k. Are your rpms dipping under?

No dips. I asked the dealership about it and they assured me it's perfectly fine.

blefevre · 01-04-2018, 10:36 AM

Mine does the same thing every once in a while. The startup has a noticeable stumble before it goes to higher revs. It's pretty rare, but has happened probably 5 times or so in 13 months.

cookiesowns · 01-05-2018, 01:58 AM

Let the fuel pump prime abit before doing cold start. It will help. Ignition on, after a few seconds, turn off, then one more. then wait, then start!

01-02-2018, 06:21 PM	#1
963mw BMW Fanatic 331 Rep 1,076 Posts Drives: M2 Join Date: Nov 2014 Location: Mexico iTrader: (0)	Slight Stutter / Rough Idle On Cold Start Hey guys, As the title states, there's something weird going on with my M2 (~850km). Whenever I cold start for the first 5-8 seconds, the car feels like it's stuttering; you can feel the engine shaking before it stabilizes and the cold start resumes as normal. Is this normal? Its not that problematic, but I didn't have this problem at all on my 435i's N55. Thanks in advance. __________________ 18 BMW M2 \| ER DP \| ER CP \| Wagner Evo 2 Comp Intercooler \| Aquamist HFS4 \| BM3 \| CSF Oil Cooler \| AFE Drop-in Filter \| Bilstein B16 PSS10
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01-02-2018, 06:33 PM	#2
horsepower_and_hounds Brigadier General 1836 Rep 4,203 Posts Drives: BMW Join Date: Aug 2012 Location: USA iTrader: (9)	Mine runs rough on and off a lot. Has 1600 miles and dealer says all is fine
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01-03-2018, 03:07 PM	#3
emdeuce Private First Class 197 Rep 155 Posts Drives: M2 ZL9 6MT Join Date: Dec 2014 Location: (626) iTrader: (0)	Cold start changes the timing and cause it to be louder and feel a little rumblier. However, The rpms are suppose to stay up around/above 1k. Are your rpms dipping under? __________________ Living Life Turn After Turn! [/url] F87 M2 Performance Edition - 2017-current F15 X5 35d - 2014-2017 E36 M3 - 2009-2016
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01-04-2018, 10:36 AM	#5
blefevre Private First Class 175 Rep 149 Posts Drives: E36 M3 Track Car, (M2 sold) Join Date: Oct 2013 Location: Colorado iTrader: (0)	Mine does the same thing every once in a while. The startup has a noticeable stumble before it goes to higher revs. It's pretty rare, but has happened probably 5 times or so in 13 months.
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01-05-2018, 01:58 AM	#6
cookiesowns ;) 587 Rep 898 Posts Drives: X5 45e, 535i N54, X3 N55 Join Date: Jan 2011 Location: West iTrader: (0)	Let the fuel pump prime abit before doing cold start. It will help. Ignition on, after a few seconds, turn off, then one more. then wait, then start! __________________ *BM3, MHD, ECUTek Calibrator* \| N55/S58 specialist \| 2023 X5 45e Frozen Marina Bay Blue
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