first M3 purchase questions.

Asianoak · 09-25-2018, 07:33 PM

hey, hoping for some advice. I've read most of the posts on what to look for before buying but I don't remember anything about around idle at start up. is this normal?

McSwine · 09-25-2018, 07:47 PM

Not sure exactly what you're asking, but mine is loud as hell for about a minute after startup (aftermarket catback exhaust) then it quietens down considerably.

roastbeef · 09-25-2018, 07:50 PM

Quote:

Originally Posted by Asianoak

hey, hoping for some advice. I've read most of the posts on what to look for before buying but I don't remember anything about around idle at start up. is this normal?

its called the "cold start cycle." basically, the engine runs a little rich and i think it retards the timing a little bit to heat up the catalysts faster to reduce emissions. its normal, and lasts for about 30 seconds.

jaehshim · 09-25-2018, 08:00 PM

u ever cold started an AMG, RS/R, other M cars, Porsche Boxer engines or any exotic car lineups?
It idles higher than normal on purpose to prevent from stalling + force richer air/fuel ratio mixture into cylinders.
In fact, all cars do it. It's just more prominent in high performance cars with "louder", more free flowing exhaust.

Asianoak · 09-26-2018, 12:25 AM

Hey, I appreciate the quick response. I haven't had the pleasure of starting up any high-performance vehicles and only E46 Ms and I don't remember it sounding so rough and... What I'd call harsh? After about 30 seconds it did seem to smooth out. But I was concerned because my Z does the same thing (allbeit much less severe) and occasionally has some idle issues that no mechanic has been able to diagnose in 5 years.

New2Roundel · 09-26-2018, 11:48 AM

Quote:

Originally Posted by Asianoak

I don't remember it sounding so rough and... What I'd call harsh? After about 30 seconds it did seem to smooth out.

Totally normal for these cars. There are software options out there that supposedly remove this, but what you're describing is normal.

Mvy · 09-26-2018, 11:53 AM

Its off topic, but heres a good post for new owners from Theodore. Check it out, its very helpful.

https://www.m3post.com/forums/showthread.php?t=1418410

///M Power-Belgium · 09-26-2018, 12:02 PM

It's the sound of thunder !

tdott · 09-26-2018, 12:26 PM

Quote:

Originally Posted by jaehshim

u ever cold started an AMG, RS/R, other M cars, Porsche Boxer engines or any exotic car lineups?
It idles higher than normal on purpose to prevent from stalling + force richer air/fuel ratio mixture into cylinders.
In fact, all cars do it. It's just more prominent in high performance cars with "louder", more free flowing exhaust.

It's for the sole purpose of reducing emissions by getting the cats up to temp faster. Nothing to do with stalling. Cold Start removal is a common option with most tunes.

Scharbag · 09-26-2018, 02:09 PM

Quote:

Originally Posted by tdott

Quote:

Originally Posted by jaehshim

u ever cold started an AMG, RS/R, other M cars, Porsche Boxer engines or any exotic car lineups?
It idles higher than normal on purpose to prevent from stalling + force richer air/fuel ratio mixture into cylinders.
In fact, all cars do it. It's just more prominent in high performance cars with "louder", more free flowing exhaust.

It's for the sole purpose of reducing emissions by getting the cats up to temp faster. Nothing to do with stalling. Cold Start removal is a comment option with most tunes.

Bugs and bunnies.

Siajoon · 09-26-2018, 06:47 PM

If my M doesnt sound like a tractor on start up something is wrong.

Asianoak · 09-26-2018, 11:16 PM

Appreciate all of the advice everyone. Cross your fingers for me. With any luck I'll be picking it up Friday night or Saturday morning

SoCalRPM · 09-27-2018, 06:36 PM

Yes, it should scare you when it starts. Especially with an exhaust. When I bought mine, the first time my wife heard it, she thought something was wrong.

burtonsbs5114 · 09-28-2018, 11:41 AM

I love cold starts, I never understood why someone would want to delete it.

BayE30 · 09-28-2018, 12:05 PM

Quote:

Originally Posted by burtonsbs5114

I love cold starts, I never understood why someone would want to delete it.

some of us DD our m3, and also leave for work early in the AM. in this case cold start is not ideal for family/neighbors.

burtonsbs5114 · 09-28-2018, 02:07 PM

Quote:

Originally Posted by SFCM3

some of us DD our m3, and also leave for work early in the AM. in this case cold start is not ideal for family/neighbors.

I DD mine, have aftermarket exhaust and live in a condo complex. My neighbors tell me they always know when I leave for work in the morning

.

spiderspider · 09-28-2018, 04:29 PM

Quote:

Originally Posted by burtonsbs5114

I love cold starts, I never understood why someone would want to delete it.

i want it to sound like that all the time. not nearly as annoying as the lambo down the street

09-25-2018, 07:33 PM	#1
Asianoak Lieutenant 143 Rep 451 Posts Drives: '11 E92 M3 & "11 X3 Join Date: Jun 2013 Location: Southern Oregon iTrader: (2) Garage List 2011 M3 [0.00]	first M3 purchase questions. hey, hoping for some advice. I've read most of the posts on what to look for before buying but I don't remember anything about around idle at start up. is this normal? __________________ Instagram: @dasianoak
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09-25-2018, 07:47 PM	#2
McSwine Private First Class 117 Rep 165 Posts Drives: 2011 E92 M3 Join Date: Dec 2016 Location: Levy, AR iTrader: (0)	Not sure exactly what you're asking, but mine is loud as hell for about a minute after startup (aftermarket catback exhaust) then it quietens down considerably.
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09-25-2018, 08:00 PM	#4
jaehshim Major 492 Rep 1,374 Posts Drives: E90 Join Date: Dec 2008 Location: NE iTrader: (3)	u ever cold started an AMG, RS/R, other M cars, Porsche Boxer engines or any exotic car lineups? It idles higher than normal on purpose to prevent from stalling + force richer air/fuel ratio mixture into cylinders. In fact, all cars do it. It's just more prominent in high performance cars with "louder", more free flowing exhaust. __________________
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09-26-2018, 12:25 AM	#5
Asianoak Lieutenant 143 Rep 451 Posts Drives: '11 E92 M3 & "11 X3 Join Date: Jun 2013 Location: Southern Oregon iTrader: (2) Garage List 2011 M3 [0.00]	Hey, I appreciate the quick response. I haven't had the pleasure of starting up any high-performance vehicles and only E46 Ms and I don't remember it sounding so rough and... What I'd call harsh? After about 30 seconds it did seem to smooth out. But I was concerned because my Z does the same thing (allbeit much less severe) and occasionally has some idle issues that no mechanic has been able to diagnose in 5 years. __________________ Instagram: @dasianoak
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09-26-2018, 11:53 AM	#7
Mvy Captain 540 Rep 979 Posts Drives: 2008 E93 M3 Join Date: Nov 2014 Location: GA Peach iTrader: (0)	Its off topic, but heres a good post for new owners from Theodore. Check it out, its very helpful. https://www.m3post.com/forums/showthread.php?t=1418410 __________________ Harrop Supercharger, BPM Tune, K/W Coil over kit, Stoptek BBK, Magnaflow exhaust, ear to ear grin everytime I drive...
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09-26-2018, 12:02 PM	#8
///M Power-Belgium General 63062 Rep 24,605 Posts Drives: ///M3-E92-DCT Silverstone II Join Date: Jul 2012 Location: Belgium iTrader: (0)	It's the sound of thunder ! __________________ "MAX VERSTAPPEN" IS THE 2021+2022+2023 F1 WORLD CHAMPION - #UnLeashTheLion BPM DEV-Tune & DCT Software-Tune & Servotronic & coding ///Alpine HID Angeleyes ///Oem.exhaust mod.
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09-26-2018, 06:47 PM	#11
Siajoon ///Majestic 1857 Rep 2,090 Posts Drives: 2011 E90 ///M3 Join Date: Jun 2010 Location: SoCal iTrader: (1)	If my M doesnt sound like a tractor on start up something is wrong.
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09-26-2018, 11:16 PM	#12
Asianoak Lieutenant 143 Rep 451 Posts Drives: '11 E92 M3 & "11 X3 Join Date: Jun 2013 Location: Southern Oregon iTrader: (2) Garage List 2011 M3 [0.00]	Appreciate all of the advice everyone. Cross your fingers for me. With any luck I'll be picking it up Friday night or Saturday morning __________________ Instagram: @dasianoak
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09-27-2018, 06:36 PM	#13
SoCalRPM Captain 886 Rep 942 Posts Drives: e92 M3 Join Date: May 2017 Location: LA iTrader: (0)	Yes, it should scare you when it starts. Especially with an exhaust. When I bought mine, the first time my wife heard it, she thought something was wrong.
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09-28-2018, 11:41 AM	#14
burtonsbs5114 Major 368 Rep 1,198 Posts Drives: 2021 F87 M2c. LBB, 6mt Join Date: Nov 2014 Location: Fort Lauderdale, FL iTrader: (0) Garage List 2006 MV Agusta Burt ... [0.00] 2012 Trek Madone 6. ... [0.00] 2008 BMW e93 M3 [0.00]	I love cold starts, I never understood why someone would want to delete it. __________________ 2021 F87 M2c. Long Beach Blue over black with blue stitching. 6mt, executive package, slick top.
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