N54 Idle speed - BMW 3-Series (E90 E92) Forum

BimmerDom · 04-01-2011, 02:20 PM

What is the factory spec for idle speed for N54?

cn555ic · 04-01-2011, 02:28 PM

670-700 rpms is what I noticed

BobS · 04-01-2011, 02:44 PM

Quote:

Originally Posted by cn555ic

670-700 rpms is what I noticed

Thats where mine usually is, but every once in a while it will bump up to 800-850 rpm and stay there. Not sure why, maybe for additional cooling?

cn555ic · 04-01-2011, 03:12 PM

Quote:

Originally Posted by BobS

Thats where mine usually is, but every once in a while it will bump up to 800-850 rpm and stay there. Not sure why, maybe for additional cooling?

Mine does that occasionally

Ilma · 04-01-2011, 03:18 PM

Mine too!

tscdennab · 04-01-2011, 05:03 PM

650RPM until you remove the primary cats...then it begins at 650 and then settles at 800 when the engine is warmed up. These are my observations on the matter.

gsmurf · 04-01-2011, 05:22 PM

650 RPM

SloMaroZ · 04-01-2011, 05:27 PM

Quote:

Originally Posted by BobS

Thats where mine usually is, but every once in a while it will bump up to 800-850 rpm and stay there. Not sure why, maybe for additional cooling?

air conditioning turned on?

Clap135 · 04-01-2011, 05:45 PM

Mine appear to have two idle speeds. 650ish and 775ish, I don't know why, but thats what it does and has been doing since I owned it.

Stucks · 04-01-2011, 08:58 PM

My car idles around 600. Always has been that way. Maybe the different idle speeds are determined by outside temp? Just a thought.

RR80 · 04-02-2011, 03:02 AM

650rpm always sometimes 720rpm, but I saw as high as 800rpm when using V5 DIC map.

BimmerDom · 04-02-2011, 09:01 PM

Quote:

Originally Posted by Clap135

Mine appear to have two idle speeds. 650ish and 775ish, I don't know why, but thats what it does and has been doing since I owned it.

Hence the reason why I asked, I just noticed the 2 idle speeds, It's not exactly hot here yet, no AC, why does it idle at higher speed once warmed up???

Schnitzel · 04-03-2011, 01:42 AM

600RPM and around 700RPM with AC on

Tzu · 04-03-2011, 02:32 PM

Mine idles around 600. Sometimes it stumbles a bit and thats when it goes up to 800, and the stumbles stop. Not sure if its a misfire, but I'm pretty sure it bumps up to 800 as a result of the stumbling.

Lilbro · 10-08-2012, 07:26 PM

Hey I've been getting that high rpm symptoms where it would stutter a quick sec the rpm climbs to about 800. Did you know what was the cause of it? Was it a sign to change the spark plugs?

marv85 · 10-08-2012, 08:10 PM

Quote:

Originally Posted by Quing

Hey I've been getting that high rpm symptoms where it would stutter a quick sec the rpm climbs to about 800. Did you know what was the cause of it? Was it a sign to change the spark plugs?

I get the same thing. I have no idea why that happens. Spark plugs didn't help, coils didn't either. I also changed my tmap recently.. didn't help.

Never changed injectors or oxygen sensors.

SEKHONZ · 12-04-2012, 08:11 PM

Dealership Changed Coils, Spark plugs, Oxygen Sensors and decarbonized injectors and My Car still has 2 idling rpms. It usually idles at 550 but occasionally my car shakes/shivers and rpm jumps to 700 and stays there till I turn my car off and restart it.

cookiesowns · 12-05-2012, 03:02 AM

Quote:

Originally Posted by BobS

Thats where mine usually is, but every once in a while it will bump up to 800-850 rpm and stay there. Not sure why, maybe for additional cooling?

Yes,

That's part of it. It is normal for idles to pick up. So far I've seen three states. The normal 650ish Idle, 750-800rpm idle, then a 1,100rpm idle after a heavy run in 85F-90F weather.

I believe it depends on your battery voltage as well, I know the car will idle high if your battery voltage isn't enough, especially on newer cars with regenerative coasting. ( Dynamic Drive )

The N54 is really quite an advance engine, and has been over engineered apart from the craptastic waste gates and HPFP :b

04-01-2011, 02:20 PM	#1
BimmerDom Second Lieutenant Drives: 2008 BMW 335i Sport/Prem 6MT Join Date: Sep 2009 Location: Ottawa, Ontario Posts: 222 iTrader: (1) Garage List 2008 BMW 335i [0.00]	N54 Idle speed What is the factory spec for idle speed for N54? __________________ 2008 BMW 335i Sport/Premium 6MT/JB3
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04-01-2011, 02:28 PM	#2
cn555ic The Coding Guy Drives: FBO 335i Vert meth/nitrous Join Date: Jun 2007 Location: Brooklyn, New York Posts: 17,907 iTrader: (5)	670-700 rpms is what I noticed __________________ *CODING BMWs in N.Y Area 917-939-4980* Call or Text for more INFO

04-01-2011, 03:18 PM	#5
Ilma Colonel Drives: BMW Join Date: Nov 2008 Location: hometown Posts: 2,240 iTrader: (0)	Mine too! __________________ Sticky is an idiot

04-01-2011, 08:58 PM	#10
Stucks Captain Drives: 2008 E92 335i Join Date: Oct 2010 Location: Montgomery County, MD Posts: 993 iTrader: (6)	My car idles around 600. Always has been that way. Maybe the different idle speeds are determined by outside temp? Just a thought. __________________ Current: 2008 e92 335i coupe. FBO+e85. Stock exhaust, no meth. 421whp/457wtq Previous: 2003 Honda Accord V6 coupe: AEM V2, zex 75 wet shot (sold)

04-03-2011, 01:42 AM	#13
Schnitzel Private First Class Drives: E92 335i MT Join Date: Mar 2009 Location: Bavaria Posts: 140 iTrader: (0)	600RPM and around 700RPM with AC on __________________

04-01-2011, 05:03 PM	#6
tscdennab Banned Drives: BMW 335i Join Date: Oct 2010 Location: Europe Posts: 1,811 iTrader: (0) Garage List 2008 BMW [3.12]	650RPM until you remove the primary cats...then it begins at 650 and then settles at 800 when the engine is warmed up. These are my observations on the matter.

04-01-2011, 05:22 PM	#7
gsmurf First Lieutenant Drives: E92 335i Join Date: Mar 2007 Location: Seattle Posts: 330 iTrader: (9) Garage List 2007 E92 335i [0.00]	650 RPM

04-01-2011, 05:45 PM	#9
Clap135 Brigadier General Drives: 2009 N54 Join Date: Jul 2009 Location: Sticky's Mom House Posts: 3,466 iTrader: (1)	Mine appear to have two idle speeds. 650ish and 775ish, I don't know why, but thats what it does and has been doing since I owned it.

04-02-2011, 03:02 AM	#11
RR80 Lieutenant Drives: F10 535i Join Date: Nov 2008 Location: Hong Kong, Vancouver Posts: 478 iTrader: (0)	650rpm always sometimes 720rpm, but I saw as high as 800rpm when using V5 DIC map.

04-03-2011, 02:32 PM	#14
Tzu Major Drives: 335i Join Date: Jun 2010 Location: Toronto Posts: 1,203 iTrader: (1)	Mine idles around 600. Sometimes it stumbles a bit and thats when it goes up to 800, and the stumbles stop. Not sure if its a misfire, but I'm pretty sure it bumps up to 800 as a result of the stumbling.

10-08-2012, 07:26 PM	#15
Lilbro Enlisted Member Drives: BMW 335i Join Date: May 2012 Location: Houston Posts: 44 iTrader: (3)	Hey I've been getting that high rpm symptoms where it would stutter a quick sec the rpm climbs to about 800. Did you know what was the cause of it? Was it a sign to change the spark plugs?

12-04-2012, 08:11 PM	#17
SEKHONZ Registered Drives: 335i Join Date: Mar 2011 Location: Reston, VA Posts: 2 iTrader: (0)	Dealership Changed Coils, Spark plugs, Oxygen Sensors and decarbonized injectors and My Car still has 2 idling rpms. It usually idles at 550 but occasionally my car shakes/shivers and rpm jumps to 700 and stays there till I turn my car off and restart it.

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