[sonicfuzion]

Just curious if anyone has ran into an issue with engine stuttering after a cold start? I have noticed this on my 2016 340i X-drive with less than 2k miles on it.

Now, I don't just drive off when I start the car, I usually wait 5 to 10 Sec. before I drive off slowly, but as I press down the accelerator slowly, the car starts to stutter for few short seconds and then it picks up. Once warmed up it's "smooo0oth as buttah".

I have an appointment with the dealer tomorrow to figure this out. This is my second F30, so I'm somewhat familiar with their imperfections.

This would be 2nd time that I am taking my 340 in to fix something. First time was to fix an o-ring washer malfunction that was causing oil leak on the front differentials within the first few hundred miles.

Anyhow, I'd like to hear from anyone who has ran into this engine stuttering issue.

Thanks.

[Big Nodge]

I sometimes experience something that could be considered a stutter when the car is first getting going. However, it's not bad enough that I've ever considered either changing my driving style or taking it to the dealership. So I imagine it is less noticeable than what you are feeling. I will mention it at my first service though.

Oh, and generally speaking with a modern forced induction car you want to just start driving, quickest way to warm it up. Don't let it idle for long, just keep RPMs under 4k or so under the oil temp has risen a bit.

[cmplaya]

sometimes i feel like mine has a rough idle vibrating through the stick, even when warmed up completely

[Beek]

This is mentioned in another thread somewhere on here. Anyway I get a slight stumble on first throttle application after a cold start, but only a true cold start like after sitting over night and it only lasts a quarter second or so, done it since new.

[MomoM3]

I have a 6MT 340ix and also notice the throttle lag/choke on my first throttle after reversing out of my garage... I would imagine this feels more prominent since I have a manual and engaging the clutch but I'm basically feeling the same thing.

[bones]

agree. i get the tiniest hesitation once every ten rides or so. nothing that concerns me YET.

[cmplaya]

Originally Posted by MomoM3

I have a 6MT 340ix and also notice the throttle lag/choke on my first throttle after reversing out of my garage... I would imagine this feels more prominent since I have a manual and engaging the clutch but I'm basically feeling the same thing.

i haven't noticed anything on mine...

[Livetodrive]

Mine's fine. No stuttering.

[2015M4inCT]

Mine does the same thing since day one. Something programmed wrong on the electronic throttle. Hasn't bothered me enough to report it.

[HitmanHearns]

omg I thought I was the only one! Mine does the same pretty consistently. Cold start and applying throttle gives it a hesitant choke of some sort.

[Ali Shiralian]

OP, why do you wait 5-10 minutes to drive off?

[goj]

The engine runs richer until it's warm. It's normal

[chicagoshark]

I turn the car on. Wait 3 seconds, and take off... no hiccups yet

[S.BMW23]

I'm getting a weird clicking from the speakers not sure what it is.

[chicagoshark]

Originally Posted by S.BMW23

I'm getting a weird clicking from the speakers not sure what it is.

I was getting that too, with my iPhone. It seems to be gone after update. Not sure if that's what it was. But I had some weird static/clicking. After car updated, doesn't seem to be there... let's hope that's it

[S.BMW23]

Originally Posted by chicagoshark

I was getting that too, with my iPhone. It seems to be gone after update. Not sure if that's what it was. But I had some weird static/clicking. After car updated, doesn't seem to be there... let's hope that's it

How would I update the car? Just got it last month.

[shawntech]

mine stutters sometimes on cold start first throttle application, don't care.

[TheObviousChild]

Same - 2016 340 6MT. Since first week of ownership I'll sometimes notice the 1st gear stuttering on my way out the neighborhood. Goes away within first minute and all is good.

[chicagoshark]

Originally Posted by S.BMW23

How would I update the car? Just got it last month.

Go to connected drive. Go to update bmw assist, hit that.

That fixed my traffic and connected drive issues. Not sure if it was what fixed the crackling via Bluetooth, but it's gone and it seemed temporally related to this update

[MomoM3]

Originally Posted by cmplaya

i haven't noticed anything on mine...

I'm talking a very, very subtle dip in RPMs when going into 1st the first time on a cold start. Even a few seconds later and it's gone.

[sonicfuzion]

Thank you all for responding to my question, Here as update as of yesterday:

After leaving my car with the Dealer overnight, the Master Mechanic calls me up and tells me that the engine stutter at beginning of the cold start is a characteristic of the new B58 Engine and its part of the new "direct turbo injection" design. Whaaat!?!

He then goes on suggesting that I should let the car warm-up for 90 seconds or so before driving away.

So when I continue to assure him that this is not my first F30, and I always allow a moment of warm-up before driving away regardless, he continues to tell me that it's normal. So this is normal for $60K car!?!

I asked if this could be an issue with the fuel mixture or perhaps if there is a software update that would address this issue, he said "No, there is noting on the bmw bulletin"

I'm still not convinced that this is normal, but I guess I will continue with the normal driving and warm-ups and see if I can get it on video next time.

Meanwhile, I'm loving the power output of the B58, much smoother and better pull comparing to my '13 335i.

[RPM90]

Originally Posted by goj

The engine runs richer until it's warm. It's normal

The problem/issue being described is not normal.

My 340i has had this from day one.
On cold or hot start, the idle goes up above 1000rpm to aroudn 1100rpm, which is normal. Then, as the engine warms and emissions control does it's thing the idle speed begins to drop. In my 340i, when the idle drops a bit under 1000rpm a vibration starts, and sometimes that vibration is strong and feels like a shake, much like a misfiring plug or misfiring injector would cause.
This continues for some seconds and once rpm drops under 800rpm the engine smooths out again.
If you have this issue it is quite noticeable as you can feel it and you can hear it. It is NOT normal.

Also, if you attempt to drive off during this common cold start idle drop, when you give it some throttle the engine will BOG with the car and your body lightly lurching forward, and then the engine picks back up.
This is problem because even by BMW's own recommendations, they don't recommend idling to warm the engine before driving off. The engine and the overall car warm up quicker while driving moderately on cold start.
The problem is that on 340i's with this idle issue you can just drive off safely because you will get that power bog. At work, when I am leaving in the late afternoon, the first light is just a few seconds away from where I park.
So this issue can extend for a minute, maybe a bit more.
At the light if it turns green quickly after I stop, I give throttle and the engine bogs just as my car moves slightly onto the cross road.

In my case this issue has become worse over time. It's been a year now.
When I first got my 340i I didn't have the power bog just the vibration and shaking. The bogging started a few months ago.

My service adviser claims there is an open case with BMW regarding my idle issue as I reported it and they noted it a couple months after I got my 340i.
However, during my last yearly service, about a week ago, the tech noted that he couldn't find an idle problem. But, the service writer told me that BMW has an updated ECU program that will be released very soon. He doesn't know the details yet so he doesn't know if BMW has sorted this idle problem, but it is there and it is not normal.

To make sure that we get BMW to fix this problem we need to make sure we report it to our service writers and that their techs don't just input "no problem found", or "couldn't replicate concern". They rely way too much on their computer interface to tell them if there is a problem. However, if the cars computer isn't triggering an error or code, then this issue won't get reported as a problem. The computer may not "see" this issue because it may still be under the limit of causing a trigger, but that doesn't mean that we who drive these cars daily don't feel and experience this problem.

Again, the reason why this isn't normal is because this is not how a modern fuel injected engine works. Vibration and shaking during cold/hot start idle down is not typical nor normal. This is my 4th BMW and the only one that has this problem. This is a new engine and new engine design, so I'm not upset that there is an issue. My problem is that the dealer tech's properly report the problem to BMW so they can figure out how to fix it.