BMW M3 Forum (E90 E92)

BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read


Go Back   M3Post - BMW M3 Forum > M3 (E90 / E92 / E93) > General M3 Forum (E90 + E92 + E93)
 
Post Reply
 
Thread Tools Search this Thread
      02-23-2016, 04:04 PM   #67
yidgyi
///M
yidgyi's Avatar
United_States
235
Rep
703
Posts

Drives: 2013 E92 M3 ZCP
Join Date: Oct 2015
Location: Northern VA

iTrader: (0)

Quote:
Originally Posted by kscarrol View Post
Understood! OP's original thread is four years old so simply trying to point yidgyi in the right direction.... As for your issue, sound like mine. Point your dealer to the thread on the issue, that's what finally got my issue resolved.
Thanks for the heads up. I have a schduled service appointment coming up and I'll mention this.
__________________
Follow me on IG: dre.pt
Appreciate 0
      02-23-2016, 04:52 PM   #68
AntTwon
Second Lieutenant
AntTwon's Avatar
United_States
28
Rep
239
Posts

Drives: 2011 M3 Sedan SGM
Join Date: Oct 2011
Location: Connecticut

iTrader: (9)

Quote:
Originally Posted by kscarrol
Understood! OP's original thread is four years old so simply trying to point yidgyi in the right direction.... As for your issue, sound like mine. Point your dealer to the thread on the issue, that's what finally got my issue resolved.
Gotcha. Sorry for the misunderstanding.

You mentioned that you showed this thread to your SA and eventually had the issue resolved? I thought that they were unable to recreate the issue? Did they come through after all? I called my dealer and mentioned the issue and that it is new as of their battery installation. It didn't seem like I was going to get far going down that route without shelling out some money for diagnostic fees.

Appreciate the help!
Appreciate 0
      04-02-2016, 10:15 PM   #69
Ram3n
Private First Class
United_States
42
Rep
167
Posts

Drives: 2008 e93 M3
Join Date: Mar 2016
Location: Gaithersburg Md

iTrader: (0)

I've got the same problem as OP. Anyone here got the answer yet?
Appreciate 0
      04-03-2016, 10:39 AM   #70
Todd0131
Lieutenant
380
Rep
530
Posts

Drives: Yukon, stumpjumper, m3
Join Date: Jul 2013
Location: Tx

iTrader: (0)

Mine does it as well. Threw codes for o2 sensors so replaced those. Still does it. Rarely pops into neutral anymore at a light. I just don't even think about it anymore. I just chalk it up to a shitty designed car. Take the good with the bad.
Appreciate 0
      04-04-2016, 10:44 PM   #71
Ram3n
Private First Class
United_States
42
Rep
167
Posts

Drives: 2008 e93 M3
Join Date: Mar 2016
Location: Gaithersburg Md

iTrader: (0)

I'm finally going to bring in my car to an Indy shop to adress this problem and I'll update what's going on when I get there this Thursday or Friday since I hate having the rpms go up and Down at a stop....
Appreciate 0
      05-26-2016, 11:56 AM   #72
schickane
Autocrosser
United_States
10
Rep
50
Posts

Drives: 2009 E90 M3
Join Date: Mar 2016
Location: Brooklyn, NY

iTrader: (2)

My 09 DCT does this. Step on brakes, idle drops to ~550. Release brakes, idle goes back to ~750.

Has anyone resolved this issue? I believe it to be vacuum related.
Appreciate 0
      05-26-2016, 01:24 PM   #73
Beemdog
Woof!
Beemdog's Avatar
United_States
352
Rep
1,323
Posts

Drives: '11 M3 ZCP LeMans Blue
Join Date: Mar 2014
Location: Sonoma Cownty, CA

iTrader: (0)

Garage List
Quote:
Originally Posted by schickane View Post
My 09 DCT does this. Step on brakes, idle drops to ~550. Release brakes, idle goes back to ~750.

Has anyone resolved this issue? I believe it to be vacuum related.
This is normal behavior for the car w/AC off-- idle moves up 200 RPM when releasing the brake. Your '09 DCT is operating as designed. Among other things, the extra RPM assists the car in creep mode when idling along in stop and go traffic.

Last edited by Beemdog; 05-27-2016 at 01:08 PM..
Appreciate 0
      05-26-2016, 03:23 PM   #74
kscarrol
Brigadier General
kscarrol's Avatar
United_States
8800
Rep
4,105
Posts

Drives: 2021 X3 M40i, 1974 2002 Tii
Join Date: Jun 2010
Location: Greenville, SC

iTrader: (0)

My DCT car does not do this. Rock steady at 750 with AC on and closer to 500 with AC off..
__________________
2021 X3 M40i
1974 2002tii, Inka, 5 sp manual
BMWCCA # 327475
Appreciate 0
      05-26-2016, 05:15 PM   #75
crypticc
Captain
United Kingdom
73
Rep
963
Posts

Drives: e92 M3 DCT + Comp
Join Date: Dec 2011
Location: London, UK

iTrader: (0)

Quote:
Originally Posted by AntTwon View Post
I have experienced this as well, but see this as a separate issue than was being discussed by the OP. It's good to know that can be addressed as well though. I once filled up with the car still running and the engine rpm began fluctuating and eventually stalled. Most times after a fill up I will start the car, drive away and experience an erratic idle while stopped at the first red light. Maybe I'll look into the breather valve as well...thanks!

I would like to believe that what Meyergru mentioned about the battery being fully charged is true, however, isn't that why we have to have our batteries registered and these cars have intelligent control of the alternator? I always thought that the alternator could be effectively disconnected from engine (primarily to reduce load during acceleration)? I wonder if there is something different about when the car is at idle.

I've been driving with the new battery for about two weeks now. If discharging the battery through normal use is going to fix the problem then I can probably live with driving around with the A/C on for a little while. Otherwise, I'm sure that the dealership will just charge us to confirm that everything is "normal".
Here you go. All your questions answered on when/how your car decides to charge and raise or lower rpm. And when your car goes to sleep and when it will show warnings or drainage or charge errors.

Covers everything from e52 up to f10 including the e92 and confirmation charge for brake energy regeneration is only calculated on start up

So see page 24 for idle speed increase if current draw cannot be supported by the battery
Attached Images
File Type: pdf 03_Power Management (1).pdf (1.07 MB, 439 views)

Last edited by crypticc; 05-26-2016 at 05:24 PM..
Appreciate 1
DrFerry6722.50
      05-26-2016, 07:57 PM   #76
BGBF18
Second Lieutenant
BGBF18's Avatar
United_States
165
Rep
216
Posts

Drives: '11 E90 M3 6MT
Join Date: Oct 2015
Location: stratosphere

iTrader: (0)

Garage List
Quote:
Originally Posted by Beemdog
Quote:
Originally Posted by schickane View Post
My 09 DCT does this. Step on brakes, idle drops to ~550. Release brakes, idle goes back to ~750.

Has anyone resolved this issue? I believe it to be vacuum related.
This is normal behavior for the car-- idle moves up 200 RPM when releasing the brake. Your '09 DCT is operating as designed. Among other things, the extra RPM assists the car in creep mode when idling along in stop and go traffic.
I believe you are correct that this is normal behavior. I don't have a DCT, but in my 6MT, the same thing happens when moving the shift lever from neutral to first. Idle moves up from 550 to ~700. Sounds like the DCT just uses the brake as the initiation mechanism.
__________________
-BG
Appreciate 0
      05-26-2016, 09:03 PM   #77
nitrojunky
Private
15
Rep
75
Posts

Drives: C6Z, 335i, e90M
Join Date: Feb 2013
Location: ATX

iTrader: (0)

mine did this for a little while after my alternator died and i therefore had to disconnect the battery. after i did the repair, when i'd pull up to a light, and depending on what i did with the brake, it'd go to a super low idle and then sometimes back to normal idle. it was so bad that the car even died once at a stoplight. it seems to have relearned whatever it is that it needs to know and now its idle is back to normal. took maybe a couple weeks of DDing for it to be back to normal.

i've read that this behavior is often correlated with disconnecting/reconnecting the battery; best explanation i found when mine was acting up and its resolution suggests it's the case.
Appreciate 0
      05-28-2016, 01:29 AM   #78
crypticc
Captain
United Kingdom
73
Rep
963
Posts

Drives: e92 M3 DCT + Comp
Join Date: Dec 2011
Location: London, UK

iTrader: (0)

Quote:
Originally Posted by BGBF18 View Post
I believe you are correct that this is normal behavior. I don't have a DCT, but in my 6MT, the same thing happens when moving the shift lever from neutral to first. Idle moves up from 550 to ~700. Sounds like the DCT just uses the brake as the initiation mechanism.
Prr technical manual once started brake pedal has no bearing on idle speed.... See page 24

Separately the creep mode in the dct is activated by a period on the accelerator only. Before then it's only hill hold .


Regards
Appreciate 0
      05-31-2016, 07:53 AM   #79
Tupug
Private
Tupug's Avatar
United_States
33
Rep
62
Posts

Drives: ///M3-DCT- E93
Join Date: Mar 2016
Location: LA, CA

iTrader: (0)

Quote:
Originally Posted by schickane View Post
My 09 DCT does this. Step on brakes, idle drops to ~550. Release brakes, idle goes back to ~750.

Has anyone resolved this issue? I believe it to be vacuum related.
I have the exact same issue..
Appreciate 0
      06-03-2016, 10:22 AM   #80
BGBF18
Second Lieutenant
BGBF18's Avatar
United_States
165
Rep
216
Posts

Drives: '11 E90 M3 6MT
Join Date: Oct 2015
Location: stratosphere

iTrader: (0)

Garage List
Quote:
Originally Posted by crypticc View Post
Prr technical manual once started brake pedal has no bearing on idle speed.... See page 24

Separately the creep mode in the dct is activated by a period on the accelerator only. Before then it's only hill hold .


Regards
I read it, thank you. While interesting, I didn't find it all that enlightening given the topic.

I get that idle can change based on load, charging, etc., but that doesn't address what several folks were seeing IMHO.

Really, my point is that the situation I described in my original post appears to be part of a normal operation and not something to sweat about.
__________________
-BG
Appreciate 0
      06-03-2016, 10:55 AM   #81
Biggus Dickus
Private
Biggus Dickus's Avatar
12
Rep
60
Posts

Drives: 09' E92 M3 - 6MT, Jerez Black
Join Date: Apr 2016
Location: Minneapolis

iTrader: (0)

Quote:
Originally Posted by BGBF18 View Post
I believe you are correct that this is normal behavior. I don't have a DCT, but in my 6MT, the same thing happens when moving the shift lever from neutral to first. Idle moves up from 550 to ~700. Sounds like the DCT just uses the brake as the initiation mechanism.
Similar thing for me. Except the RPMs go back up when the clutch is pushed in not when shifting into first.
__________________
2009 E92 - 6MT - Jerez Black - Bone Stock
Appreciate 0
      06-03-2016, 11:34 AM   #82
FramingLogic
Student
FramingLogic's Avatar
Germany
24
Rep
190
Posts

Drives: GT3, 335i, Charger
Join Date: Sep 2015
Location: WPB, FL ~ Bielefeld, DE ~ Dover, UK

iTrader: (0)

My 335i had a rough idle when i first got it, fixed it when i did a walnut blast, changed plugs and replaced 2 injectors (because they where the oldest ones and all the rest where pretty new). I put thought into just how much carbon these engines have, main reason i actually want to go over to full e85. My buddy has a 335i running 100% e85 and puts out about 800hp+, had the car from 36k miles till 120k now and has never had an issue. Kinda tells me that the cars run much cleaner and better on it, but thats off topic
Appreciate 1
DrFerry6722.50
      06-03-2016, 12:09 PM   #83
vsix
Lieutenant Colonel
vsix's Avatar
No_Country
602
Rep
1,611
Posts

Drives: M3 E92 sold, M4 F82
Join Date: Nov 2012
Location: ATL

iTrader: (0)

Quote:
Originally Posted by FramingLogic View Post
My 335i had a rough idle when i first got it, fixed it when i did a walnut blast, changed plugs and replaced 2 injectors (because they where the oldest ones and all the rest where pretty new). I put thought into just how much carbon these engines have, main reason i actually want to go over to full e85. My buddy has a 335i running 100% e85 and puts out about 800hp+, had the car from 36k miles till 120k now and has never had an issue. Kinda tells me that the cars run much cleaner and better on it, but thats off topic
Ok, that was maybe off topic but those numbers you mentioned...holy cow...
Appreciate 0
      06-07-2016, 06:33 PM   #84
FramingLogic
Student
FramingLogic's Avatar
Germany
24
Rep
190
Posts

Drives: GT3, 335i, Charger
Join Date: Sep 2015
Location: WPB, FL ~ Bielefeld, DE ~ Dover, UK

iTrader: (0)

Quote:
Originally Posted by vsix View Post
Ok, that was maybe off topic but those numbers you mentioned...holy cow...
True Story, Compression issue might come into play in the future to come, but otherwise I vouch those numbers ^^ look up "the kracken" on youtube
__________________
~2008 E92 Single Turbo Project~
719whp/658wtq @29 PSI
FFTEC Precision 6466 Bottom mount
cppnr1@gmail.com
Appreciate 0
      08-30-2016, 06:04 AM   #85
woody888
Private First Class
54
Rep
195
Posts

Drives: E92 & F80 M3
Join Date: Nov 2014
Location: CA

iTrader: (0)

so, Does any one get the problem's result what it is?

I have the same issue on my E92 m3...
Appreciate 0
      08-30-2016, 11:47 AM   #86
Nickdm3
Private First Class
United_States
17
Rep
144
Posts

Drives: Bmw m3
Join Date: Oct 2015
Location: Chicago

iTrader: (1)

had a similar issue on my e46 for a few years. finally the car broke down and found that i had a bad coil. replaced the coil and issue went away. you may have a coil going bad
Appreciate 0
      08-30-2016, 01:52 PM   #87
MFL
Major
MFL's Avatar
174
Rep
1,246
Posts

Drives: E92 M3
Join Date: Sep 2013
Location: Bellevue, WA

iTrader: (3)

Garage List
2010 BMW M3  [9.00]
Hint: Brake Booster.
Appreciate 1
Bolos21.00
      08-31-2016, 01:41 AM   #88
woody888
Private First Class
54
Rep
195
Posts

Drives: E92 & F80 M3
Join Date: Nov 2014
Location: CA

iTrader: (0)

I have checked the vaccum booster that is fine.
It does not leak or has the warnning code.

If that might be booster.what the symbolic issue on the booster?

Quote:
Originally Posted by MFL View Post
Hint: Brake Booster.
Appreciate 0
Post Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -5. The time now is 04:25 AM.




m3post
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST