RPM drops on idle

woody888 · 08-31-2016, 03:34 AM

Hi~, sir.
Do you got the answer yet? i have the same issue that i still can not figure
out

Quote:

Originally Posted by schickane

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.

woody888 · 12-01-2016, 12:13 PM

I did the same issue on my 2012 E92 m3 for twice!

The judgment that is BATTERY.

First time:
I raced on track for 4-5 hours, the battery is charged it self fully.
(normally, I drive my M3 just about 2-3 hours a week.)
After 1 week without driving, the problem is gone!

Second time.
Im studying abroad. as a result, I disconnected the battery for 1 month.
I used the charger to charge my battery up to 98%-100% electricity.
than, I put it back to my M3.
Guess what! the same issue is happened!
I will try not to dive my car for 1 week , It should be worked!

Quote:

Originally Posted by meyergru

Sound like all of you had their batteries charged at the workshop unknowingly. In that case, the battery will be 100% full so that the car electronics decides not to charge the battery, thus needing lower RPM to just keep the engine running at idle.

You can watch the RPM change when you switch off the A/C, for example. With the A/C off the RPM drops by 100.

After a few days the self-discharge or normal operations will get the battery to a low enough charging level such that the RPM needed to recharge it will be higher.

superJ_92 · 12-01-2016, 01:41 PM

Has anyone got the answer yet? really annoying.

osukf09 · 12-01-2016, 08:14 PM

+1

MMM3PWR · 12-01-2016, 09:23 PM

CHECK coils

Bolos · 12-02-2016, 01:39 AM

Vacuum brake booster possibly or idle actuator /sensor.

woody888 · 12-02-2016, 11:03 AM

I posted my issue which is possible to be the reason.
Might be the full battery electricity.

I had checked the vaccum booster and vaccum pipe , there is no leaking.

How's your problem when it's happened?

Quote:

Originally Posted by superJ_92

Has anyone got the answer yet? really annoying.

woody888 · 12-02-2016, 11:05 AM

what kind of the coils?

Quote:

Originally Posted by MMM3PWR

CHECK coils

Beemdog · 12-02-2016, 12:20 PM

Quote:

Originally Posted by woody888

what kind of the coils?

Each spark plug has an individual coil.

Bolos · 12-04-2016, 04:05 PM

Quote:

Originally Posted by woody888

I posted my issue which is possible to be the reason.
Might be the full battery electricity.

I had checked the vaccum booster and vaccum pipe , there is no leaking.

How's your problem when it's happened?

Quote:

Originally Posted by superJ_92

Has anyone got the answer yet? really annoying.

Even tho there is no leak the sensor still goes bad so just make sure...

monterey · 12-05-2016, 08:54 AM

There is something called the lemon law if they can't find it. If you bring it in 3x for the same problem they will buy it back.

E92_TYLER · 12-05-2017, 07:25 AM

Refreshing this thread as i know MANY others have this issue. Just checking in to see what everyone has done to fix this issue or just deals with the vibration?

gfisher99 · 12-05-2017, 10:05 AM

I also have this issue. Get the crazy vibrations/drone when it drops below a certain point. Mostly happens in the winter for me as the when the AC is on the idle is increased enough to counteract this problem. Hoping someone finds the real cause.

nick3753 · 12-05-2017, 06:09 PM

Ditto

BOOF-M3 · 12-05-2017, 06:16 PM

I have the same issue in my 328. Indy states that it's a sensor in the gas tank. I'll check in with him again to see which sensor. Anyone else know?

gfisher99 · 12-06-2017, 02:17 PM

Quote:

Originally Posted by BOOF-M3

I have the same issue in my 328. Indy states that it's a sensor in the gas tank. I'll check in with him again to see which sensor. Anyone else know?

I do occasionally get a fault code that says "Activate tank valve". I reset it and the code (not the low idle) goes away for a bit then comes back at a later point. May have something to do with it considering what you said above.

BOOF-M3 · 12-06-2017, 03:00 PM

Quote:

Originally Posted by gfisher99

Quote:

Originally Posted by BOOF-M3

I have the same issue in my 328. Indy states that it's a sensor in the gas tank. I'll check in with him again to see which sensor. Anyone else know?

I do occasionally get a fault code that says "Activate tank valve". I reset it and the code (not the low idle) goes away for a bit then comes back at a later point. May have something to do with it considering what you said above.

Just asked my Indy. He said that is the code I have also. I have an OBD scanner and the car here. I'll run out and check it myself. Maybe it is the issue and two members having it might solidly that being the problem. He seems to think so. Do you have an actual code# letters?

spazzyfry123 · 12-06-2017, 05:09 PM

My 6MT car has ALWAYS been idling at 500-550 RPM. I honestly thought that's just where it was supposed to be until someone told me otherwise. No vibrations or anything.

gfisher99 · 12-07-2017, 09:37 AM

Quote:

Originally Posted by BOOF-M3

Just asked my Indy. He said that is the code I have also. I have an OBD scanner and the car here. I'll run out and check it myself. Maybe it is the issue and two members having it might solidly that being the problem. He seems to think so. Do you have an actual code# letters?

Just checked my Carly garage and it shows as "002772 Activate tank vent valve". Hope this helps!

BOOF-M3 · 12-07-2017, 10:22 AM

Quote:

Originally Posted by gfisher99

Quote:

Originally Posted by BOOF-M3

Just asked my Indy. He said that is the code I have also. I have an OBD scanner and the car here. I'll run out and check it myself. Maybe it is the issue and two members having it might solidly that being the problem. He seems to think so. Do you have an actual code# letters?

Just checked my Carly garage and it shows as "002772 Activate tank vent valve". Hope this helps!

Hmmm I don't believe I'm getting that code or equivalent anymore. I have three codes on the Blue driver scanner. 2E85, 2E8B and 578E

E92_TYLER · 12-08-2017, 07:45 AM

I have been checking mine ever since it started and i still dont have any codes :/ so not sure what it could be. I have noticed in the colder weather 40 degrees and below it doesnt seem to do it.

R3dliner · 12-14-2017, 10:35 AM

My car has been idling 500-550 on idle since I've picked up car which I thought was normal. I've been noticing though recently as temperatures have dropped my idle is staying at 700-750 consistently.

12-01-2016, 01:41 PM	#91
superJ_92 New Member 0 Rep 5 Posts Drives: E92 M3 FROZEN WHITE Join Date: Nov 2016 Location: EDMONTON iTrader: (0)	Has anyone got the answer yet? really annoying.
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12-01-2016, 08:14 PM	#92
osukf09 First Lieutenant 64 Rep 341 Posts Drives: 2011 e92 M3 ZCP Join Date: Nov 2010 Location: San Francisco, CA iTrader: (0)	+1
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12-01-2016, 09:23 PM	#93
MMM3PWR E90 6MT MASTER 74 Rep 314 Posts Drives: 2008 M3 Join Date: Mar 2013 Location: Porto Heli iTrader: (0)	CHECK coils __________________
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12-02-2016, 01:39 AM	#94
Bolos Private First Class 21 Rep 110 Posts Drives: 2011 M3 Saloon Competition Join Date: Dec 2013 Location: California iTrader: (0)	Vacuum brake booster possibly or idle actuator /sensor.
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12-05-2016, 08:54 AM	#99
monterey Major 339 Rep 1,239 Posts Drives: 2008 M3 Join Date: Mar 2016 Location: United States iTrader: (1)	There is something called the lemon law if they can't find it. If you bring it in 3x for the same problem they will buy it back.
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12-05-2017, 07:25 AM	#100
E92_TYLER Private First Class 76 Rep 161 Posts Drives: 2009 E92 M3 DCT AW Join Date: Mar 2016 Location: oklahoma iTrader: (0) Garage List 2009 BMW M3 [0.00]	Refreshing this thread as i know MANY others have this issue. Just checking in to see what everyone has done to fix this issue or just deals with the vibration? __________________ Current: 09' E92 M3 DCT Alpine white / Black Current: 13' F150 Fx4 -daily Past: 04' E55 AMG Fbo, 03' E46 M3 99' E36 M3, 92' 240 RB26 408whp rocketbunny 03' SVT Cobra 481whp, 89' Fox 5.0 lx notch
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12-05-2017, 10:05 AM	#101
gfisher99 Lieutenant 287 Rep 562 Posts Drives: '11 E92 M3, '18 M2, '22 X3M Join Date: Feb 2016 Location: Austin, TX iTrader: (0)	I also have this issue. Get the crazy vibrations/drone when it drops below a certain point. Mostly happens in the winter for me as the when the AC is on the idle is increased enough to counteract this problem. Hoping someone finds the real cause.
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12-05-2017, 06:09 PM	#102
nick3753 Major 1020 Rep 1,486 Posts Drives: 2012 e92 M3 DCT ZCP Join Date: Oct 2010 Location: Michigan iTrader: (0) Garage List 2017 Audi S6 [0.00] 1997 BMW 328i Touring [0.00] 2012 BMW M3 [0.00]	Ditto
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12-05-2017, 06:16 PM	#103
BOOF-M3 Brigadier General 4452 Rep 4,014 Posts Drives: 2011 M3 Join Date: Nov 2014 Location: South Pasadena Florida iTrader: (1)	I have the same issue in my 328. Indy states that it's a sensor in the gas tank. I'll check in with him again to see which sensor. Anyone else know?
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12-06-2017, 05:09 PM	#106
spazzyfry123 Lieutenant Colonel 4359 Rep 1,913 Posts Drives: Here and There Join Date: Jul 2013 Location: North Georgia Mountains iTrader: (1) Garage List 97 Toyota Land Cruiser [7.50] 16 Toyota Land Cruiser [10.00] 11 BMW E90 M3 Stripper [10.00]	My 6MT car has ALWAYS been idling at 500-550 RPM. I honestly thought that's just where it was supposed to be until someone told me otherwise. No vibrations or anything.
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12-08-2017, 07:45 AM	#109
E92_TYLER Private First Class 76 Rep 161 Posts Drives: 2009 E92 M3 DCT AW Join Date: Mar 2016 Location: oklahoma iTrader: (0) Garage List 2009 BMW M3 [0.00]	I have been checking mine ever since it started and i still dont have any codes :/ so not sure what it could be. I have noticed in the colder weather 40 degrees and below it doesnt seem to do it. __________________ Current: 09' E92 M3 DCT Alpine white / Black Current: 13' F150 Fx4 -daily Past: 04' E55 AMG Fbo, 03' E46 M3 99' E36 M3, 92' 240 RB26 408whp rocketbunny 03' SVT Cobra 481whp, 89' Fox 5.0 lx notch
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12-14-2017, 10:35 AM	#110
R3dliner Lieutenant Colonel 935 Rep 1,930 Posts Drives: 18 M3 6MT Join Date: Mar 2016 Location: NYC iTrader: (5)	My car has been idling 500-550 on idle since I've picked up car which I thought was normal. I've been noticing though recently as temperatures have dropped my idle is staying at 700-750 consistently.
	Appreciate 1 spazzyfry1234358.50 Quote