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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Fri, Mar-17-2017, 10:09:20 PM   #1
Hernan1990
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Default Idle hunting/ stalling while stopped(car warm)

So I have a problem and have been reading for a while without any clear answer.
2 days ago, my 2004 M3 stalled at a light after some idle dips. It did it 3 more times when stopped. It then did it the next day and today.

I did some research on the forum, but many people where having the issues while the car was cold, and some cleared up by the time the car was warm. Mine is when the car is fully warmed up

The idle will drop while the car is stopped at a light in neutral or 1st, or when coasting to the light in neutral. Sometimes, the car will catch itself, but sometimes it will stall.It will do it after it's fully warmed up.It wont always do it tho, it is very random. The car starts up fine after stalling and no CEL light comes on. I just cleaned the MAF with no improvements. I did notice the rubber seal from the intake to the maf tube(don't know the actual name) is dry rotted. Not sure if that could cause issues. I will replace regardless, but I'm trying to track down the actual problem now.
Any idea of what to do next?
thanks for any help you can give!
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Old Fri, Mar-17-2017, 10:12:02 PM   #2
toy4to
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Default Re: Idle hunting/ stalling while stopped(car warm)

Clean your IACV - idle air control valve. There's a good diy posted here somewhere. You'll have to remove your intake manifold, which is a daunting task if its your first time.
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Old Fri, Mar-17-2017, 10:16:58 PM   #3
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Default Re: Idle hunting/ stalling while stopped(car warm)

Check for vacuum leaks
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Old Sat, Mar-18-2017, 12:41:50 PM   #4
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Default Re: Idle hunting/ stalling while stopped(car warm)

Quote:
Originally Posted by SeanE46 View Post
Check for vacuum leaks
Are there any common places to look at first? I am not mechanically inclined but willing to learn. Thanks!
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Old Sat, Mar-18-2017, 01:57:03 PM   #5
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Default Re: Idle hunting/ stalling while stopped(car warm)

Quote:
Originally Posted by toy4to View Post
Clean your IACV - idle air control valve. There's a good diy posted here somewhere. You'll have to remove your intake manifold, which is a daunting task if its your first time.

Can you post a link to that DIY
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Old Sat, Mar-18-2017, 02:38:22 PM   #6
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Default Re: Idle hunting/ stalling while stopped(car warm)

Please use the search function. There are a ton of results if you search for 'idle control valve' and also search for 'intake manifold removal'.

Here's the link to remove the manifold. Once you have that removed, you'll have access to the IACV. You'll need to remove the clamps on it and clean it out with throttle body cleaner. Replace the clamps with new ones (worm gear clamps will work).

http://www.m3forum.net/m3forum/showthread.php?t=262263

This youtube video is for the regular e46, but the process is similar.


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Originally Posted by rpearl555 View Post
Can you post a link to that DIY

Last edited by toy4to; Sat, Mar-18-2017 at 02:52:45 PM.
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Old Sat, Mar-18-2017, 02:54:11 PM   #7
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Default Re: Idle hunting/ stalling while stopped(car warm)

Quote:
Originally Posted by toy4to View Post
Please use the search function. There are a ton of results if you search for 'idle control valve' and also search for 'intake manifold removal'.

Here's the link to remove the manifold. Once you have that removed, you'll have access to the IACV. You'll need to remove the clamps on it and clean it out with throttle body cleaner. Replace the clamps with new ones (worm gear clamps will work).

http://www.m3forum.net/m3forum/showthread.php?t=262263

I wanted to see the DIY that you seemed to be referencing. But thanks
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Old Sat, Mar-18-2017, 02:59:31 PM   #8
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Default Re: Idle hunting/ stalling while stopped(car warm)

I wasn't able to find a specific DIY for the IACV. Getting the intake manifold off is most of the work. On our cars, the IACV is located under the 2nd throttle body. You'll see it once you remove the intake manifold.

Quote:
Originally Posted by rpearl555 View Post
I wanted to see the DIY that you seemed to be referencing. But thanks
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Old Sun, Mar-19-2017, 09:57:39 PM   #9
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Default Re: Idle hunting/ stalling while stopped(car warm)

Quick update:

I am having the car scanned today just in case.

The weather for the 3 days the car started stalling got lower than usual(40f-50f)
Today I took the car out(80f-85f weather) and the car didn't stall. I drove it for about an hour on different roads and made many stops without any issues. The only difference was the hotter weather.

Since I am not very mechanically inclined, I have to ask, could the weather be a factor?
The car has a VF engineering intake(has MAF) w/ GIAC tune. Since the car was in Puerto Rico before(warm weather year long), could the cold weather we got here cause problems with the tune? or maybe if there vacuum leak, could the different temperatures make a difference? maybe air density? no clue, but random thoughts. Any opinions welcomed.
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Old Sun, Mar-19-2017, 11:39:19 PM   #10
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Default Re: Idle hunting/ stalling while stopped(car warm)

Quote:
Originally Posted by Hernan1990 View Post
Quick update:

I am having the car scanned today just in case.

The weather for the 3 days the car started stalling got lower than usual(40f-50f)
Today I took the car out(80f-85f weather) and the car didn't stall. I drove it for about an hour on different roads and made many stops without any issues. The only difference was the hotter weather.

Since I am not very mechanically inclined, I have to ask, could the weather be a factor?
The car has a VF engineering intake(has MAF) w/ GIAC tune. Since the car was in Puerto Rico before(warm weather year long), could the cold weather we got here cause problems with the tune? or maybe if there vacuum leak, could the different temperatures make a difference? maybe air density? no clue, but random thoughts. Any opinions welcomed.
Could be a possibility, but I'm leaning towards that intake being the issue.
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Discussing Idle hunting/ stalling while stopped(car warm) in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)