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E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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  #1  
Old 01-27-2010, 05:59 PM
newc6 newc6 is offline
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Normal idle speed?

I have a 2002 325i I just bought. The car runs well, no codes are stored, accelerates smoothly, etc etc. My question is what is the normal idle speed when in gear at a stop (I have the automatic)? Mine is approx. 550 RPM estimated by dash tach.
The car vibrates a little when stopped, in gear. It isn't as smooth as I remember my old E36 328 and my E39 530, both inline 6's.
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  #2  
Old 01-27-2010, 06:19 PM
mujjuman mujjuman is offline
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Sounds normal for automatic e46s
my idle is 700
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  #3  
Old 01-27-2010, 07:18 PM
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That's NOT normal. I have 550 rpm the majority of the time in D and R and it causes the engine to vibrate. It PISSES ME OFF WITH A PASSION.

OP, please search around, we discussed it many times, but we have not found a cure for it...
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  #4  
Old 01-27-2010, 07:30 PM
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golforcars325i golforcars325i is offline
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I'm consistently in the 750-800 range.......... always a smooth idle.
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  #5  
Old 01-27-2010, 07:55 PM
Ryan M Ryan M is offline
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The only way to increase idle speed is with a gt1/icom. I believe the adjustment window is +/- 100 rpms. I raised the idle on my car by 50 rpm, been smooth as silk and no stalling ever since.
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  #6  
Old 01-27-2010, 08:27 PM
Starless Starless is offline
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Quote:
Originally Posted by Ryan M View Post
The only way to increase idle speed is with a gt1/icom. I believe the adjustment window is +/- 100 rpms. I raised the idle on my car by 50 rpm, been smooth as silk and no stalling ever since.
Very interesting idea. Where did you have this done? (Dealership, Indy, other)?

P.S My idle is 620rpm, very smooth, no vibration. But I'd like to bump it to 720 which sounds more "normal"...
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  #7  
Old 01-27-2010, 08:38 PM
Ryan M Ryan M is offline
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Quote:
Originally Posted by Starless View Post
Very interesting idea. Where did you have this done? (Dealership, Indy, other)?

P.S My idle is 620rpm, very smooth, no vibration. But I'd like to bump it to 720 which sounds more "normal"...
I did it myself with a gt1 when I was in school with BMW. There was an SIB on my car for stalling and the cause was that the idle speed was too low. I raised it and it hasn't stalled since.
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  #8  
Old 01-28-2010, 08:02 AM
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I idle at about 550 according to the tach and it's smooth as silk . I was starting to feel the vibration at stop while in D but it went away after replaceing my control arms and CABS .
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  #9  
Old 01-28-2010, 08:06 AM
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Around 600 rpm, and it's smooth. I thought this was the normal idle speed for these cars. Maybe its different with an auto
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  #10  
Old 01-28-2010, 08:26 AM
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Mine's around 650 RPM, and it's smooth with no vibrations.
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  #11  
Old 01-28-2010, 08:40 AM
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Quote:
Originally Posted by jonathan2263 View Post
I idle at about 550 according to the tach and it's smooth as silk . I was starting to feel the vibration at stop while in D but it went away after replaceing my control arms and CABS .
Thanks for that information! When I replace my controls arms and bushings in a month or two I hope it gets rid of the vibration.
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  #12  
Old 01-28-2010, 10:31 AM
jamescurt jamescurt is offline
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mine is 750-800 rpm nice and smooth not an automatic though
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  #13  
Old 01-28-2010, 11:56 AM
newc6 newc6 is offline
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I guess what I should take from all the responses is don't worry. It could be caused, or remedied, by a number of things. I guess until I have further issues, I won't worry about it.

Thanks to all who responded.
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  #14  
Old 01-28-2010, 12:23 PM
bimmerboy2051 bimmerboy2051 is offline
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My idle is about 550 in drive and about 650-700 in park.
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  #15  
Old 01-28-2010, 02:32 PM
newc6 newc6 is offline
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Quote:
Originally Posted by bimmerboy2051 View Post
My idle is about 550 in drive and about 650-700 in park.
Exactly what I am seeing.
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  #16  
Old 01-28-2010, 02:51 PM
bimmerboy2051 bimmerboy2051 is offline
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Quote:
Originally Posted by newc6 View Post
Exactly what I am seeing.
Well thats good to know you and I have the same idles! However...I feel the 550 idle in drive is a little too low and I wish it would be the same as it is in park (650-700). From what I have read and researched on here...low idle could be a NUMBER of things. I have heard DISA, cleaning of the ICV, cleaning of the MAF and torque converter. Ive yet to tackle the projects of cleaning my MAF and ICV and while at it...checking the condition of my DISA. For now...my car runs just fine...and im living with it. lol.
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  #17  
Old 01-28-2010, 02:57 PM
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Quote:
Originally Posted by bimmerboy2051 View Post
Well thats good to know you and I have the same idles! However...I feel the 550 idle in drive is a little too low and I wish it would be the same as it is in park (650-700). From what I have read and researched on here...low idle could be a NUMBER of things. I have heard DISA, cleaning of the ICV, cleaning of the MAF and torque converter. Ive yet to tackle the projects of cleaning my MAF and ICV and while at it...checking the condition of my DISA. For now...my car runs just fine...and im living with it. lol.
?

why?
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  #18  
Old 01-28-2010, 03:02 PM
bimmerboy2051 bimmerboy2051 is offline
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Quote:
Originally Posted by jonathan2263 View Post
?

why?
Haha...I dunno...it just dosent...seem right. Even Solidjake thinks so in post #3. But then again...I am incredibly anal retentive (NO JOKES PLEASE! haha) and am very attention to detail. When I am idling in drive I can even feel a slight, not normal vibration if you will. By no means is it shaking and idling poorly or anything...it just dosent seem right. See my thread here: http://www.bimmerfest.com/forums/sho...047&highlight= ugh...I think im just looking too hard into this as I do with most things.
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Last edited by bimmerboy2051; 01-28-2010 at 03:11 PM.
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  #19  
Old 01-28-2010, 03:15 PM
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jonathan2263 jonathan2263 is offline
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I guess the simple solution is keep your foot on the gas and off the brake
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  #20  
Old 01-28-2010, 03:20 PM
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jonathan2263 jonathan2263 is offline
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Maybe someone else can shed some light on this but...

Don't you put more strain on the motor the moment you put it into D in an auto trans ? If that's the case won't it cause the rpm's to drop while your stopped with your foot on the brake ? Isn't it natural for an auto trans to idle lower in D than P ?


EDIT: I think what's happening is when you are at a stop in D the torque converter is spinning . That puts more strain on the motor and drops the rpm's . Ask Smolck and he'll tell you his "seat of the pants dyno" after his manual trans swap showed noticable improvement . This is probably in large part because he no longer had a torque converter needlessly useing up engine power.

Did I get that right ? If you can correct or further enlighten me please do . Let the flamefest begin...

Oh and also... OP- I don't think low engine rpm's is the cause of your vibration .
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Last edited by jonathan2263; 01-28-2010 at 03:40 PM.
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  #21  
Old 01-29-2010, 06:14 PM
mujjuman mujjuman is offline
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i want my car to idle at 850
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  #22  
Old 01-30-2010, 11:47 PM
valbauer valbauer is offline
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Wouldn't have that problem with a 6MT
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  #23  
Old 01-31-2010, 09:40 AM
newc6 newc6 is offline
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Originally Posted by valbauer View Post
Wouldn't have that problem with a 6MT
True, but then again I don't have a 6mt, at least not in the bimmer.
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  #24  
Old 01-31-2010, 12:19 PM
bimmerboy2051 bimmerboy2051 is offline
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Wouldn't have that problem with a 6MT
yeah yeah yeah...lol. im so getting a manual next time around. A Z4M coupe! I so want that car...
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  #25  
Old 12-21-2012, 08:53 PM
tgib1223 tgib1223 is offline
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vibs

You might wont to check your motor mounts and trans.
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