Rough Idle E90 M3

BRNDNSLVRA · 03-10-2018, 04:34 PM

Cars been idling really rough lately. Cold start cycle takes a little longer than usual. The car has a very noticeable vibration. It'll sometimes bog down and shake violently. Also, especially from 3-4k rpm, its not as smooth of an acceleration as it used to be. Thought it was bad gas but this is my third fill up with the same issue.

SOMEONE PLEASE HELP

EJT86 · 03-10-2018, 04:59 PM

No codes? Then it’s most likely your fuel breather valve

BRNDNSLVRA · 03-10-2018, 05:33 PM

Quote:

Originally Posted by EJT86

No codes? Then it’s most likely your fuel breather valve

I keep hearing

Idle Control Valve
Spark plugs (which I did a month ago so thats not possible)
Ignition coils

I did scan my car today at work and got these codes

27EB
A3B2
A0B1
A0B5
A118
A37C
E2D4

We cleared those and they didnt come back

EJT86 · 03-10-2018, 05:59 PM

Quote:

Originally Posted by 954MM

I keep hearing

Idle Control Valve
Spark plugs (which I did a month ago so thats not possible)
Ignition coils

I did scan my car today at work and got these codes

27EB
A3B2
A0B1
A0B5
A118
A37C
E2D4

We cleared those and they didnt come back

Everyone immediately says ICV but often it’s the fuel breather valve. I just changed mine out a couple weeks ago, car idled poorly struggled to not stall a few times and actually stalled a bunch of times, idle would bounce too. ICV will throw a code so if you see one for A failing ICV then ok but look into replacing the fuel breather valve first it’s $78 at Tischer

http://www.m3post.com/forums/showthr...ht=Idle&page=5

Toward the bottom of page 5 I think is where it was resolved

GORDON.M3 · 03-11-2018, 04:25 PM

breather valve most likely, pull the ICV out and give it a good cleaning also.

BRNDNSLVRA · 03-11-2018, 04:27 PM

Quote:

Originally Posted by gordon@

breather valve most likely, pull the ICV out and give it a good cleaning also.

Ordering the part this week! Gonna do what you guys suggested. Thank you

Jhanksm3 · 03-11-2018, 05:20 PM

I had same issue replaced breather valve fixed it

BRNDNSLVRA · 03-11-2018, 05:21 PM

Quote:

Originally Posted by jhanksevo

I had same issue replaced breather valve fixed it

Lettuce pray this is my issue

Jhanksm3 · 03-11-2018, 06:00 PM

Cheap and easy bro

BRNDNSLVRA · 03-13-2018, 02:38 PM

Quote:

Originally Posted by jhanksevo

Cheap and easy bro

Just drove a bone stock M3 and it pulls harder than my car

: Wonder if that lil piece will really effect performance

EJT86 · 03-13-2018, 02:46 PM

Quote:

Originally Posted by 954MM

Just drove a bone stock M3 and it pulls harder than my car

: Wonder if that lil piece will really effect performance

Performance. Probably not but your car will idle normally

BRNDNSLVRA · 03-13-2018, 02:48 PM

Quote:

Originally Posted by EJT86

Quote:

Originally Posted by 954MM

Just drove a bone stock M3 and it pulls harder than my car

: Wonder if that lil piece will really effect performance

Performance. Probably not but your car will idle normally

Kinda scary because after driving that car, I realized that my car doesnt pull the same anymore. I'll do the ICV cleaning as well. Seems to be what the issue is. Was thinking TBA and bearings going bad but I doubt it.

Also, that other E90 has stock DCT software. Mine has the GTS flash but its been weird. Completely off topic but Im getting it reflashed.

EJT86 · 03-13-2018, 02:52 PM

Quote:

Originally Posted by 954MM

Kinda scary because after driving that car, I realized that my car doesnt pull the same anymore. I'll do the ICV cleaning as well. Seems to be what the issue is. Was thinking TBA and bearings going bad but I doubt it.

Also, that other E90 has stock DCT software. Mine has the GTS flash but its been weird. Completely off topic but Im getting it reflashed.

Yea I remember you having issues launching, maybe a reflash will do it. I don’t think the ICV would affect performance while driving, if it were a TA you’d def know it and bearing wouldn’t affect performance prior to failing so seems like it must be a software issue. Once you do the breather and the reflash you’ll have a clearer view of where to maybe look next

EJT86 · 03-13-2018, 02:54 PM

Make sure you have a small hoss clamp when you replace the breather. One of the metal bands isn’t reusable

BRNDNSLVRA · 03-13-2018, 02:55 PM

Quote:

Originally Posted by EJT86

Make sure you have a small hoss clamp when you replace the breather. One of the metal bands isnÂ’t reusable

Nothing I cant get at Lowes/Home Depot right????

EJT86 · 03-13-2018, 03:00 PM

Quote:

Originally Posted by 954MM

Nothing I cant get at Lowes/Home Depot right????

Yea I forget the size but a basic one that’s about the size of your thumb or index finger I want to say 5/8. But I’m sure you’d rather have it before taking the car apart lol

doogee · 03-13-2018, 03:02 PM

Quote:

Originally Posted by 954MM

Nothing I cant get at Lowes/Home Depot right????

I recommend going to the dealer and buying the oem style Oetiker clamp to prevent any leaks.

They're cheap.

EJT86 · 03-13-2018, 03:07 PM

Quote:

Originally Posted by doogee

I recommend going to the dealer and buying the oem style Oetiker clamp to prevent any leaks.

They're cheap.

But you also need a special tool to set that clamp

doogee · 03-13-2018, 03:08 PM

Quote:

Originally Posted by EJT86

But you also need a special tool to set that clamp

If you're in a pinch, side cutters will work fine.

Also if we are even talking about the leak detection pump, there are no hose clamps. One grommet and one clip style connection.

Perhaps you're confused with the purge valve?

EDIT: I see BMW even calls this a breather valve.

EJT86 · 03-13-2018, 03:11 PM

Quote:

Originally Posted by doogee

If you're in a pinch, side cutters will work fine.

Also if we are even talking about the leak detection pump, there are no hose clamps. One grommet and one clip style connection.

Perhaps you're confused with the purge valve?

We’re all talking about the purge valve under the hood

doogee · 03-13-2018, 03:13 PM

Either way I would not put money on the ICV or the Purge valve. Your symptoms are present under load and these shouldn't cause an issue.

Check for misfires. Maybe you have two separate issues.

Mdriv3r · 03-13-2018, 05:11 PM

I once had an issue with rough and low idle. Sometimes the car would even stall. So what I did was run Chevron with Techron concentrate through the fuel system and drive the car for awhile, then I changed the spark plugs. Be careful with this, because If your injectors are dirty, it can foul a plug.
This is why I suggest doing plugs after running the treatment. I also updated my DME to 2.41 with Rheingold 3.57 a year or two ago. The car runs awesome now. Idle and stalling has not been an issue at all. Not sure if this is the right path for you, but just suggesting. As for cold start, mine is a bit like that too, all of them are. As I still have my cats, I haven't gotten rid of it. Turner stage 2 software will remove the cold start cycle if your not a fan, but its only beneficial in your catless. Otherwise Stage 1 is good and will also update your DME to 2.40, which is the last update that had any fuel mapping adjustments.

Lastly, make sure your thermostat is good. If the car takes a long time for the engine to warm up, it could be a failing thermostat. I did mine just a week ago and the car is running much better. I think it had gone to a default map due to that. I had a code for the thermostat as well. So if you don't have that code, it won't likely be an issue. Also be aware that thermostat codes are intermittent, but a faulty or failing thermostat can cause poor performance.

Just wanted to offer an opinion bc the ICV is a rather expensive part and in my case, I did not need it.

03-10-2018, 04:34 PM	#1
BRNDNSLVRA 奈良シカマル 905 Rep 482 Posts Drives: 2011 Space Gray E90 M3 Join Date: Oct 2016 Location: Broward County, FL iTrader: (0)	Rough Idle E90 M3 Cars been idling really rough lately. Cold start cycle takes a little longer than usual. The car has a very noticeable vibration. It'll sometimes bog down and shake violently. Also, especially from 3-4k rpm, its not as smooth of an acceleration as it used to be. Thought it was bad gas but this is my third fill up with the same issue. SOMEONE PLEASE HELP __________________ http://954mm.com IG: @954MM/@954M3
	Appreciate 0 Tweet Quote

03-10-2018, 04:59 PM	#2
EJT86 Brigadier General 2383 Rep 3,726 Posts Drives: 2018 M2 Join Date: Mar 2014 Location: Boston, MA iTrader: (0) Garage List [0.00] 2018 BMW M2 [0.00]	No codes? Then it’s most likely your fuel breather valve
	Appreciate 0 Quote

03-11-2018, 04:25 PM	#5
GORDON.M3 Brigadier General 1423 Rep 3,001 Posts Drives: E92 M3 • F25 X3 M-Sport Join Date: Dec 2013 Location: LAX/YYZ/NRT iTrader: (11)	breather valve most likely, pull the ICV out and give it a good cleaning also. __________________ INSTAGRAM: GORDON.M3 North American Mr12Volt Carplay/Android Auto Distributor DINAN \| EVOSPORT \| VAC \| ARP \| RD SPORT \| NEEZ \| EIBACH \| CSF \| IND \| BILSTEIN \| KLASSEN \| BREMBO \| ENDLESS \| BBS \| BPM SPORT \| PROJECT MU \| EVENTURI
	Appreciate 0 Quote

03-11-2018, 05:20 PM	#7
Jhanksm3 Captain 230 Rep 620 Posts Drives: 2023 G80 M3 Comp Join Date: Mar 2011 Location: Charleston SC via Raleigh NC iTrader: (2)	I had same issue replaced breather valve fixed it
	Appreciate 0 Quote

03-11-2018, 06:00 PM	#9
Jhanksm3 Captain 230 Rep 620 Posts Drives: 2023 G80 M3 Comp Join Date: Mar 2011 Location: Charleston SC via Raleigh NC iTrader: (2)	Cheap and easy bro
	Appreciate 0 Quote

03-13-2018, 02:54 PM	#14
EJT86 Brigadier General 2383 Rep 3,726 Posts Drives: 2018 M2 Join Date: Mar 2014 Location: Boston, MA iTrader: (0) Garage List [0.00] 2018 BMW M2 [0.00]	Make sure you have a small hoss clamp when you replace the breather. One of the metal bands isn’t reusable
	Appreciate 1 BRNDNSLVRA904.50 Quote

03-13-2018, 03:13 PM	#21
doogee Major 748 Rep 1,256 Posts Drives: '08 M3, '09 328xi Sport Wagon Join Date: Oct 2008 Location: Ancaster, ON, Canada iTrader: (0)	Either way I would not put money on the ICV or the Purge valve. Your symptoms are present under load and these shouldn't cause an issue. Check for misfires. Maybe you have two separate issues. __________________
	Appreciate 0 Quote

03-13-2018, 05:11 PM	#22
Mdriv3r First Lieutenant 149 Rep 392 Posts Drives: F13 M6 Join Date: Apr 2014 Location: Great Lakes iTrader: (0) Garage List 2014 F13 M6 Competi ... [9.63] 2005 E46 330Ci [0.00]	I once had an issue with rough and low idle. Sometimes the car would even stall. So what I did was run Chevron with Techron concentrate through the fuel system and drive the car for awhile, then I changed the spark plugs. Be careful with this, because If your injectors are dirty, it can foul a plug. This is why I suggest doing plugs after running the treatment. I also updated my DME to 2.41 with Rheingold 3.57 a year or two ago. The car runs awesome now. Idle and stalling has not been an issue at all. Not sure if this is the right path for you, but just suggesting. As for cold start, mine is a bit like that too, all of them are. As I still have my cats, I haven't gotten rid of it. Turner stage 2 software will remove the cold start cycle if your not a fan, but its only beneficial in your catless. Otherwise Stage 1 is good and will also update your DME to 2.40, which is the last update that had any fuel mapping adjustments. Lastly, make sure your thermostat is good. If the car takes a long time for the engine to warm up, it could be a failing thermostat. I did mine just a week ago and the car is running much better. I think it had gone to a default map due to that. I had a code for the thermostat as well. So if you don't have that code, it won't likely be an issue. Also be aware that thermostat codes are intermittent, but a faulty or failing thermostat can cause poor performance. Just wanted to offer an opinion bc the ICV is a rather expensive part and in my case, I did not need it.
	Appreciate 1 BRNDNSLVRA904.50 Quote