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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > N54 Idle speed



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      04-01-2011, 02:20 PM   #1
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N54 Idle speed

What is the factory spec for idle speed for N54?
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      04-01-2011, 02:28 PM   #2
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670-700 rpms is what I noticed
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      04-01-2011, 02:44 PM   #3
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Quote:
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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?
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      04-01-2011, 03:12 PM   #4
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Quote:
Originally Posted by BobS View Post
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
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      04-01-2011, 03:18 PM   #5
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Mine too!
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      04-01-2011, 05:03 PM   #6
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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, 05:22 PM   #7
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650 RPM
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      04-01-2011, 05:27 PM   #8
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Quote:
Originally Posted by BobS View Post
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?
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      04-01-2011, 05:45 PM   #9
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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, 08:58 PM   #10
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My car idles around 600. Always has been that way. Maybe the different idle speeds are determined by outside temp? Just a thought.
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      04-02-2011, 03:02 AM   #11
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650rpm always sometimes 720rpm, but I saw as high as 800rpm when using V5 DIC map.
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      04-02-2011, 09:01 PM   #12
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Quote:
Originally Posted by Clap135 View Post
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???
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      04-03-2011, 01:42 AM   #13
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600RPM and around 700RPM with AC on
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      04-03-2011, 02:32 PM   #14
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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, 07:26 PM   #15
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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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      10-08-2012, 08:10 PM   #16
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Originally Posted by Quing View Post
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.
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      12-04-2012, 08:11 PM   #17
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Cool

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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      12-05-2012, 03:02 AM   #18
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Quote:
Originally Posted by BobS View Post
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
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