N54 Idle speed

BimmerDom · 04-01-2011, 03:20 PM

What is the factory spec for idle speed for N54?

cn555ic · 04-01-2011, 03:28 PM

670-700 rpms is what I noticed

BobS · 04-01-2011, 03:44 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, 04:12 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, 04:18 PM

Mine too!

tscdennab · 04-01-2011, 06:03 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, 06:22 PM

650 RPM

qtrlifecrisis · 04-01-2011, 06:27 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, 06:45 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, 09:58 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, 04:02 AM

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

BimmerDom · 04-02-2011, 10:01 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, 02:42 AM

600RPM and around 700RPM with AC on

Tzu · 04-03-2011, 03:32 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, 08:26 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, 09:10 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

iqraceworks · 11-19-2019, 09:44 PM

....I know I'm reserecting an old thread, but has anyone used the option in MHD to increase their idle speed a little?

My 07' 335i idles around 650-ish rpms. But if I press on the pedal ever so slightly and raise the idle to around 750-800 rpms.....it seems to really smooth out the idle. It also gets rid of some of the cabin resonance/vibration I sometimes hear when sitting at a light when the car is in gear (maybe a side effect of the catless downpipes??).

Is there any downside to bumping up the idle a little bit in order to smooth it out?

IllSic_Design · 11-19-2019, 10:34 PM

No downside, and yes I have done it. I needed to raise it to ~850 because I have stiff motor mounts, so it smooths out the vibrations. I actually just used INPA the 2nd time since I switched back to a stock map to smog the car, but still needed a higher idle due to the stiff mounts.

Datsun770 · 01-15-2023, 01:29 PM

Hello 2019!!!! I have this exact issue. Smcae starts. Idles at 1k rpm. Idle then drops to 550-600 rpm and its a little Lumpy. Give it another 100-200 rpm and it smooths out. Previous owner mapped car. I wonder if that is a consequence of the map. No info on it. Did anyone ever find a solution to this? Mine results in some components clunking together jn the engine bay which goes away when this smooths out so keen for a fix. Cheers

iqraceworks · 01-15-2023, 01:56 PM

Quote:

Originally Posted by Datsun770

Hello 2019!!!! I have this exact issue. Smcae starts. Idles at 1k rpm. Idle then drops to 550-600 rpm and its a little Lumpy. Give it another 100-200 rpm and it smooths out. Previous owner mapped car. I wonder if that is a consequence of the map. No info on it. Did anyone ever find a solution to this? Mine results in some components clunking together jn the engine bay which goes away when this smooths out so keen for a fix. Cheers

Check for leaky injectors....

04-01-2011, 03:20 PM	#1
BimmerDom Second Lieutenant 37 Rep 275 Posts Drives: 2018 X3 xDrive 30i Join Date: Sep 2009 Location: Ottawa, Ontario iTrader: (1) Garage List 2018 BMW X3 30i [0.00] 2016 BMW 340i X-Drive [0.00]	N54 Idle speed What is the factory spec for idle speed for N54? __________________ New Rides: BMW X3 30i & Telsa Model 3 PLR RWD Sold:2016 BMW 340i xDrive 2008 BMW 335i Sport/Premium 6MT/JB3
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04-01-2011, 03:28 PM	#2
cn555ic 462 Rep 18,331 Posts Drives: 335i Join Date: Jun 2007 Location: US iTrader: (6)	670-700 rpms is what I noticed
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04-01-2011, 04:18 PM	#5
Ilma Colonel 193 Rep 2,854 Posts Drives: 2023 M4 Competition Join Date: Nov 2008 Location: Mississauga iTrader: (0)	Mine too!
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04-01-2011, 06:03 PM	#6
tscdennab Banned 156 Rep 1,809 Posts Drives: BMW 335i Join Date: Oct 2010 Location: Europe iTrader: (0) Garage List 2008 BMW [6.24]	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.
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04-01-2011, 06:22 PM	#7
gsmurf First Lieutenant 9 Rep 332 Posts Drives: F30 340i Xdrive Join Date: Mar 2007 Location: Seattle iTrader: (9) Garage List 2011 328i Xdrive [0.00]	650 RPM
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04-01-2011, 06:45 PM	#9
Clap135 Brigadier General 105 Rep 3,460 Posts Drives: 2009 N54 Join Date: Jul 2009 Location: Sticky's Mom House 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.
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04-01-2011, 09:58 PM	#10
Stucks Lieutenant Colonel 180 Rep 1,911 Posts Drives: 2017 F30 340i Xdrive Join Date: Oct 2010 Location: Montgomery County, MD iTrader: (12)	My car idles around 600. Always has been that way. Maybe the different idle speeds are determined by outside temp? Just a thought. __________________ Current: 2017 F30 340i xdrive Previous: 2008 e92 335i coupe: RB turbos, mach 116 race fuel, methanol, alot of boost. Previous: 2003 Honda Accord V6 coupe: AEM V2, zex 75 wet shot (sold)
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04-02-2011, 04:02 AM	#11
RR80 Lieutenant 17 Rep 480 Posts Drives: F10 535i Join Date: Nov 2008 Location: Hong Kong, Vancouver iTrader: (0)	650rpm always sometimes 720rpm, but I saw as high as 800rpm when using V5 DIC map.
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04-03-2011, 02:42 AM	#13
Schnitzel Private First Class 10 Rep 147 Posts Drives: E92 335i MT Join Date: Mar 2009 Location: Bavaria iTrader: (0)	600RPM and around 700RPM with AC on __________________ [SIGPIC][/SIGPIC]
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04-03-2011, 03:32 PM	#14
Tzu Lieutenant Colonel 29 Rep 1,551 Posts Drives: 335i Join Date: Jun 2010 Location: Toronto 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.
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10-08-2012, 08:26 PM	#15
Lilbro Second Lieutenant 17 Rep 250 Posts Drives: BMW 335i Join Date: May 2012 Location: Houston iTrader: (13)	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?
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12-04-2012, 08:11 PM	#17
SEKHONZ Registered 0 Rep 2 Posts Drives: 335i Join Date: Mar 2011 Location: Reston, VA 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.
	Appreciate 0 Quote

11-19-2019, 09:44 PM	#19
iqraceworks Brigadier General 2098 Rep 3,811 Posts Drives: 2007 335i Join Date: Aug 2019 Location: Missouri iTrader: (0)	....I know I'm reserecting an old thread, but has anyone used the option in MHD to increase their idle speed a little? My 07' 335i idles around 650-ish rpms. But if I press on the pedal ever so slightly and raise the idle to around 750-800 rpms.....it seems to really smooth out the idle. It also gets rid of some of the cabin resonance/vibration I sometimes hear when sitting at a light when the car is in gear (maybe a side effect of the catless downpipes??). Is there any downside to bumping up the idle a little bit in order to smooth it out?
	Appreciate 0 Quote

11-19-2019, 10:34 PM	#20
IllSic_Design Colonel 2125 Rep 2,759 Posts Drives: 12 E92 328i Join Date: Jun 2016 Location: Northern California iTrader: (1)	No downside, and yes I have done it. I needed to raise it to ~850 because I have stiff motor mounts, so it smooths out the vibrations. I actually just used INPA the 2nd time since I switched back to a stock map to smog the car, but still needed a higher idle due to the stiff mounts.
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01-15-2023, 01:29 PM	#21
Datsun770 New Member 0 Rep 28 Posts Drives: 2006 320D Join Date: Jun 2015 Location: Ayrshire uk iTrader: (0)	Hello 2019!!!! I have this exact issue. Smcae starts. Idles at 1k rpm. Idle then drops to 550-600 rpm and its a little Lumpy. Give it another 100-200 rpm and it smooths out. Previous owner mapped car. I wonder if that is a consequence of the map. No info on it. Did anyone ever find a solution to this? Mine results in some components clunking together jn the engine bay which goes away when this smooths out so keen for a fix. Cheers
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