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      07-03-2014, 11:50 AM   #23
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My car has done this since I first picked it up. Unfortunately East Bay BMW says "nothing is wrong". They also couldn't get the car to hesitate when making a brief stop then resuming (as in stop on a right hand turn on a red with no traffic)-even though it happens 100% of the time when I drive.
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      07-03-2014, 12:36 PM   #24
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I just tell people my car has a 'cam' in it... lol
Seriously, my car is an '11 with all of 4700 mi on it & doing this already.
That sucks. I have a 2011 with 13,000 miles and it started doing this a few months ago. It definitely was not the way the car arrived and so i know there's a problem. I'll keep trying until this fixed...luckily still have almost two years of warranty left. I'm hoping its an O2 sensor problem and they can fix it. I've already switched off of Shell gas and the issue is still here.
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      07-03-2014, 08:12 PM   #25
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S85 V10's suffer from the same up and down idle, but usually during a warm start.. No solution has been found. Some say it is normal, its the cars DME sorting the exhaust temps of the cats or something.
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      07-04-2014, 07:39 PM   #26
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I just had my ICV and secondary MAF replaced at the dealership for a similar issue.
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      07-04-2014, 08:15 PM   #27
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Interesting. I noticed this on my car as well. Mine is a 2011 e90 with ~24k miles. Mine does it only on cold starts and once I get driving it pretty much goes away. Never does it at any other stops. I've experienced issues like this in the past on other cars but they were all Hondas and the issue was persistent even outside of cold start. Because the idle issue didn't happen outside of cold start I assumed it was a normal occurrence.

Car drives completely fine otherwise. Wondering if I should get it checked out... Car is under factory warranty for at least another few months
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      07-05-2014, 06:52 AM   #28
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Interesting. I noticed this on my car as well. Mine is a 2011 e90 with ~24k miles. Mine does it only on cold starts and once I get driving it pretty much goes away. Never does it at any other stops. I've experienced issues like this in the past on other cars but they were all Hondas and the issue was persistent even outside of cold start. Because the idle issue didn't happen outside of cold start I assumed it was a normal occurrence.

Car drives completely fine otherwise. Wondering if I should get it checked out... Car is under factory warranty for at least another few months
It doesn't hurt. My buddy's E93 idles what I would consider normal:
On a warm or cold start, the idle goes up to 1500 and slowly settles down. There is no needle bob, rev hunting, or engine surging. I feel like that's the way the car was designed and whatever issue, despite it's significance, is still abnormal. If the car is under warranty, why not get it fixed before potentially turns into something more worrisome that equals big bucks later down the line.
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      07-05-2014, 03:35 PM   #29
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After replacing ICV (warranty) it's about 90% good now. The other 10% might be in my head.
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      07-24-2014, 01:52 AM   #30
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BMW of NA is looking into this issue on my car....but I noticed for the past few starts, if the air conditioner is off when I start the car, I don't get the fluctuating idle. Does that have any significance?
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      07-24-2014, 11:25 AM   #31
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BMW of NA is looking into this issue on my car....but I noticed for the past few starts, if the air conditioner is off when I start the car, I don't get the fluctuating idle. Does that have any significance?
No difference for me.
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      07-24-2014, 11:40 AM   #32
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My car did that (and worse, higher amplitudes) shortly after 1 tank full of BP gas.

I added the BMW/Techron cleaner and went back to Sunoco, my usual gas station, and the issue went away. No parts were changed.

I always shut off the AC compressor 30 seconds before shutdown (this will prevent mildew buildup) and I never start the car with the compressor on.
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      07-24-2014, 02:18 PM   #33
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Its the gas you are using. Try a different source.

Here in the UK i get that when i use Fuel from Tesco (Their premium stuff). Problem goes away after a "clean out cycle" of using BP fuel (Premium).

These are smart engines/machines and the manual says the ECU takes time to adapt to fuel...so stick to a kind which doesn't cause this problem.
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      07-25-2014, 08:20 AM   #34
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Weird thing is problem has persisted despite changing gas stations.
But turning the air conditioning off, and I no longer get this issue.
I guess that's one solution but the problem still hasn't been fixed
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      07-25-2014, 09:00 AM   #35
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Quote:
Originally Posted by Stallion150 View Post
Weird thing is problem has persisted despite changing gas stations.
But turning the air conditioning off, and I no longer get this issue.
I guess that's one solution but the problem still hasn't been fixed
Maybe listen to the compressor unit as the idle is fluctuating, see if the a/c compressor clutch is activating/deactivating in a similar rhythm as the idle.
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      07-28-2014, 09:48 AM   #36
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Maybe listen to the compressor unit as the idle is fluctuating, see if the a/c compressor clutch is activating/deactivating in a similar rhythm as the idle.
It actually seems to be doing this pretty rhythmically. The air compressor and idle bob seem to be in synch. When the air is off when I star the car, no more idle fluctuation.
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      07-31-2014, 04:30 PM   #37
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Guys, my round trip daily commute is <10 miles. When I took it to the dealer, the battery charge was mildly low. Should I get a battery tender? I wonder if this is causing any startup issue.
.
I read somewhere else, that there's an "A/C pressure switch operates when the A/C is turned on. The info from the switch is used to increase the engine load in order to compensate for the extra load placed on the engine by the A/C. " Could this be the issue?
.
Thanks so much, you've really helped a super OCD M3 owner out!
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      07-31-2014, 04:32 PM   #38
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Quote:
Originally Posted by Stallion150 View Post
Guys, my round trip daily commute is <10 miles. When I took it to the dealer, the battery charge was mildly low. Should I get a battery tender? I wonder if this is causing any startup issue.
.
I read somewhere else, that there's an "A/C pressure switch operates when the A/C is turned on. The info from the switch is used to increase the engine load in order to compensate for the extra load placed on the engine by the A/C. " Could this be the issue?
.
Thanks so much, you've really helped a super OCD M3 owner out!
10 miles isn't much. I would definitely (and do) use a tender but does this issue happen if you start the car with no HVAC running at all?
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      07-31-2014, 08:59 PM   #39
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10 miles isn't much. I would definitely (and do) use a tender but does this issue happen if you start the car with no HVAC running at all?
No it doesn't. It only happens when I run the HVAC at full strength. I've started the car about 10 times now with the HVAC off, and the issue no longer presents itself.
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      08-01-2014, 07:33 PM   #40
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From my experience it's not that simple; the dealer replaced all of the above and the problem still hasn't gone away.
Definitely not that simple for me either. When I take it in, the dealer just tells me that there's nothing wrong. "We can't get it do happen."

Strange, it happens nearly every time I drive the car...
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      08-01-2014, 09:28 PM   #41
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Definitely not that simple for me either. When I take it in, the dealer just tells me that there's nothing wrong. "We can't get it do happen."

Strange, it happens nearly every time I drive the car...
What helped for me was I took iPhone videos of the problem so at least they had to acknowledge it. There is a PUMA case on the issue; I'm happy to give you the # in case that helps you.

Does yours have any relation to the air conditioner?
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      10-20-2014, 04:48 PM   #42
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Hey guys---not to bring up an old thread for no reason, but BMW of NA ended up sending their master tech.
.
Checked the car out and took it for a hard drive and the tech said it was "normal behavior" to have the idle fluctuate like that. Doesn't sound entirely right to me, but the problem has never escalated after >1 year, so will let it be.
.
I noticed something today though, when the idle does rev up and down, light throttle to the gas and it breaks fine....
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