why engine and RPM does that on my brand new E93 when engine is first turned on

mhaghighi · 08-31-2011, 08:35 PM

for few seconds like is going to turn off? like the RPM goes up and down and the engine is catching itself from turning off and then is perfect. Car has 5k on it and now it seems to be everytime is turned on after a while of time car turned off

elm3 · 08-31-2011, 09:04 PM

Mine does the same thing. I think that it is normal.

Asiarush · 08-31-2011, 10:01 PM

mine goes up and down a bit but never to a point where it almost turns off.
maybe something that can be simply tuned by the dealer.

Legion5 · 08-31-2011, 11:20 PM

This is a trick used on almost all modern cars. The engine will idle below the point where it would die if left unattended and then it increases it's revs for split seconds to save itself from dying. This is just a common trick used to save gas.

BlackSaphr · 08-31-2011, 11:33 PM

Mine does the same thing, as long as it doesn't stall I don't think you should worry. From what I gathered our engines don't have MAF sensors so idle adjustment is a bit rougher

luis_m3 · 09-01-2011, 02:32 AM

Totally normal... I think of it as a "first strectch", before the warm-up, and then the fun begins.

Pointerman · 09-01-2011, 09:50 AM

I love the sound. I sounds raw when it is first warming up. Go to a race track some time and listen to a race car when it is just turned on and not yet warm. Very similar behavior. Colds starts are one of my favorite things about this car.

Mr C · 09-01-2011, 09:57 AM

Both of mine do that, it is NORMAL.

raiste · 09-01-2011, 10:37 AM

Yep, just warming the cats up.

FifthStreetz · 09-01-2011, 02:26 PM

when i start mine cold the RPMs jump up to 1.5K for a few seconds, drops to 1, then to a little bit over .5K. Always paranoid that i got idle control valve problem.

racedoc11 · 09-01-2011, 04:33 PM

same here! It appeared after they did my idle valve 2 years ago....

Quote:

Originally Posted by mhaghighi

for few seconds like is going to turn off? like the RPM goes up and down and the engine is catching itself from turning off and then is perfect. Car has 5k on it and now it seems to be everytime is turned on after a while of time car turned off

VOM3 · 09-02-2011, 02:24 AM

Pretty sure all M3's would idle a little rough on cold starts. In winter its alot more aggressive, so colder it is outside rougher it will idle I guess.....

Nothing to worry about!!!

Rex Heat · 09-02-2011, 01:49 PM

Quote:

Originally Posted by Pointerman

I love the sound. I sounds raw when it is first warming up. Go to a race track some time and listen to a race car when it is just turned on and not yet warm. Very similar behavior. Colds starts are one of my favorite things about this car.

I totally agree, it sounds so bad ass in the garage when it's cold.

OldenburgerM3 · 09-02-2011, 02:02 PM

you guys remember chokes from before there were automatic chokes (or systems that serve the same purpose)?
A motor doesn't just start up and run like it's been on for hours.

Saves gas? Holy cow, come on!

08-31-2011, 08:35 PM	#1
mhaghighi Private First Class Drives: 2011 Convertible M3 Join Date: Mar 2011 Location: Jacksonville, FL Posts: 118 iTrader: (1)	why engine and RPM does that on my brand new E93 when engine is first turned on for few seconds like is going to turn off? like the RPM goes up and down and the engine is catching itself from turning off and then is perfect. Car has 5k on it and now it seems to be everytime is turned on after a while of time car turned off
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08-31-2011, 09:04 PM	#2
elm3 M3 Lover Drives: 2009 e92 M3 Interlagos Blue Join Date: Sep 2008 Location: Canton, GA. Posts: 1,791 iTrader: (1) Garage List 2009 E92 M3 [5.00] 2002 Nissan Xterra ... [0.50] 2004 Yamaha R1 [0.00]	Mine does the same thing. I think that it is normal. __________________ '09 E92 ///M3 Interlagos Blue, 6MT, Silver Novillo Leather, CF Trim, Premium Package, Technology Package, Cold Weather Package, Premium Sound, 19" Wheels, Moonroof-Toy//'02 Nissan Xterra- Daily Driver/ '04 Yamaha R1- Toy/'06Yamaha Raptor 350- Toy
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08-31-2011, 10:01 PM	#3
Asiarush Private First Class Drives: 2010 M3 Join Date: May 2010 Location: Los Angeles Posts: 176 iTrader: (2)	mine goes up and down a bit but never to a point where it almost turns off. maybe something that can be simply tuned by the dealer. __________________ 2010 M3 Jerez Black Metalic, Premium Package, Technology Package, M Double Clutch with driveLogic
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08-31-2011, 11:20 PM	#4
Legion5 Major Drives: e92 Join Date: Dec 2007 Location: USA Posts: 1,356 iTrader: (12)	This is a trick used on almost all modern cars. The engine will idle below the point where it would die if left unattended and then it increases it's revs for split seconds to save itself from dying. This is just a common trick used to save gas. __________________ Clean cars are happy cars! CANON PHOTOGRAPHER
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09-01-2011, 09:57 AM	#8
Mr C Captain Drives: E92 Dakar and E90 AW Join Date: Aug 2009 Location: SoCal Posts: 754 iTrader: (0)	Both of mine do that, it is NORMAL. __________________ 2011 E90 M3 Alpine White M-DCT 2011 E92 M3 Individual Dakar 6MT
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08-31-2011, 11:33 PM	#5
BlackSaphr Private Drives: E92 M3 Join Date: Jun 2011 Location: MTL Posts: 64 iTrader: (0)	Mine does the same thing, as long as it doesn't stall I don't think you should worry. From what I gathered our engines don't have MAF sensors so idle adjustment is a bit rougher
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09-01-2011, 02:32 AM	#6
luis_m3 Low Pro... Drives: 2011 E90 AW Join Date: Dec 2010 Location: Germany Posts: 951 iTrader: (0)	Totally normal... I think of it as a "first strectch", before the warm-up, and then the fun begins.
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09-01-2011, 09:50 AM	#7
Pointerman Second Lieutenant Drives: 2011 BMW M3 Join Date: Jun 2011 Location: Manteca, CA Posts: 211 iTrader: (0)	I love the sound. I sounds raw when it is first warming up. Go to a race track some time and listen to a race car when it is just turned on and not yet warm. Very similar behavior. Colds starts are one of my favorite things about this car.
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09-01-2011, 10:37 AM	#9
raiste Time is the fire in which we burn. Drives: 2010 M3 E92 Join Date: May 2010 Location: SC Posts: 161 iTrader: (2)	Yep, just warming the cats up.
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09-01-2011, 02:26 PM	#10
FifthStreetz O! So Sour!! Drives: Fast e30 / Slow M3 Join Date: Apr 2007 Location: Fort Lee, NJ Posts: 15,438 iTrader: (22) Garage List 2008 M3 [4.75]	when i start mine cold the RPMs jump up to 1.5K for a few seconds, drops to 1, then to a little bit over .5K. Always paranoid that i got idle control valve problem. __________________
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09-02-2011, 02:24 AM	#12
VOM3 New Member Drives: E92 M3 Join Date: Aug 2011 Location: Australia Posts: 13 iTrader: (0)	Pretty sure all M3's would idle a little rough on cold starts. In winter its alot more aggressive, so colder it is outside rougher it will idle I guess..... Nothing to worry about!!!
	0

09-02-2011, 02:02 PM	#14
OldenburgerM3 Private Drives: 2011 Jet Black M3 Coupe Join Date: Feb 2011 Location: TX Posts: 58 iTrader: (0)	you guys remember chokes from before there were automatic chokes (or systems that serve the same purpose)? A motor doesn't just start up and run like it's been on for hours. Saves gas? Holy cow, come on!
	0

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