[shoman24v]

I have a 2018 330i with 14k miles that I just bought CPO. I've noticed that when the car is on a cold start, like the day after, it makes a what seems to be a drive line clunk on cold starts. If you listen closely in the video, you can hear what sounds like a bang right after the vehicle starts. You can physically feel the car move as if it was in the driveline. Is this normal? Doesn't do it when warm that I have noticed. Car is under warranty, but just wanted to get some input before I make an appointment.

**UPDATE** jump to post #16 for repair.

[ReallyRadams]

Originally Posted by shoman24v

I have a 2018 330i with 14k miles that I just bought CPO. I've noticed that when the car is on a cold start, like the day after, it makes a what seems to be a drive line clunk on cold starts. If you listen closely in the video, you can hear what sounds like a bang right after the vehicle starts. You can physically feel the car move as if it was in the driveline. Is this normal? Doesn't do it when warm that I have noticed. Car is under warranty, but just wanted to get some input before I make an appointment.

I had a new 2017 330i mine did this same thing and had them check it out and was told they couldn’t recreate the it. I bought a CPO 2017 330i few months ago and it makes the exact same sound. I would have no idea what this could be, but I’d love to find out. Just to make sure it’s not something that could cause a problem later on.

[shoman24v]

Originally Posted by ReallyRadams

I had a new 2017 330i mine did this same thing and had them check it out and was told they couldn’t recreate the it. I bought a CPO 2017 330i few months ago and it makes the exact same sound. I would have no idea what this could be, but I’d love to find out. Just to make sure it’s not something that could cause a problem later on.

They probably couldn't recreate it because it doesn't do it warm.

I'm in that boat too. I have a feeling it's not a problem, but I want a record of it in case there ever comes to be one. I want to take it in so they can take a look, but since it doesn't do it warm, it would have to sit overnight. I did manage to find one post here describing this issue, but with only a couple replies. The problem (if we want to call it that) does exist, we just have to figure out now what is causing it.

[ReallyRadams]

Originally Posted by shoman24v

They probably couldn't recreate it because it doesn't do it warm.

I'm in that boat too. I have a feeling it's not a problem, but I want a record of it in case there ever comes to be one. I want to take it in so they can take a look, but since it doesn't do it warm, it would have to sit overnight. I did manage to find one post here describing this issue, but with only a couple replies. The problem (if we want to call it that) does exist, we just have to figure out now what is causing it.

They kept it for 3 days, but they also said they for the it for 10 miles and the odometer only had 3 more miles so who knows how honest they are haha

Would love to know if you find out what it is

[ReallyRadams]

Originally Posted by shoman24v

I have a 2018 330i with 14k miles that I just bought CPO. I've noticed that when the car is on a cold start, like the day after, it makes a what seems to be a drive line clunk on cold starts. If you listen closely in the video, you can hear what sounds like a bang right after the vehicle starts. You can physically feel the car move as if it was in the driveline. Is this normal? Doesn't do it when warm that I have noticed. Car is under warranty, but just wanted to get some input before I make an appointment.

We’re you able to find out what the pop sound is? Mine did it today when the car was warm.

[shoman24v]

Originally Posted by ReallyRadams

We’re you able to find out what the pop sound is? Mine did it today when the car was warm.

From what I gather it is the transmission doing a self check at startup. The only way I can really mitigate the sound is when I park in the garage to leave the car overnight to cool, is to put the handbrake on first, then press park. That way, there's no weight pulling back on the transmission to make the clunk more apparent. At some point I will take my car in for warranty work. Probably when it cools down here. I will note this issue.

[mikewhiskey]

Originally Posted by shoman24v

From what I gather it is the transmission doing a self check at startup. The only way I can really mitigate the sound is when I park in the garage to leave the car overnight to cool, is to put the handbrake on first, then press park. That way, there's no weight pulling back on the transmission to make the clunk more apparent. At some point I will take my car in for warranty work. Probably when it cools down here. I will note this issue.

Did you find out anything definitive about this? I have a '19 440i and the car briefly "bumps" forward while in park immediately after cold starting. Mine doesn't make any noise though.

[shoman24v]

Originally Posted by mikewhiskey

Did you find out anything definitive about this? I have a '19 440i and the car briefly "bumps" forward while in park immediately after cold starting. Mine doesn't make any noise though.

No, not yet but it seems this is pretty common to these cars. I still plan on taking my car in for a few service items so when I do, I'll mention it.

[mikewhiskey]

Originally Posted by shoman24v

No, not yet but it seems this is pretty common to these cars. I still plan on taking my car in for a few service items so when I do, I'll mention it.

What's got me puzzled is my 2018 440i that I recently sold never once did this and it's the same car, same mileage, etc.

[shoman24v]

Originally Posted by mikewhiskey

What's got me puzzled is my 2018 440i that I recently sold never once did this and it's the same car, same mileage, etc.

I am guessing it has to do with transmission programming. It only occurs when cold and happens more times than not.

I was able to find this SIB on an older BMW but it seems to be the same issue.

[mikewhiskey]

Originally Posted by shoman24v

I am guessing it has to do with transmission programming. It only occurs when cold and happens more times than not.

I was able to find this SIB on an older BMW but it seems to be the same issue.

Yes, saw that, thank you.

I'm also a little surprised not many people with F30's/ ZF 8HP's chime in on this which makes me think it's not common. I scoured the internet and forums and didn't find anything about it except this thread, and one other, no definite info

[2017F30]

Originally Posted by mikewhiskey

Yes, saw that, thank you.

I'm also a little surprised not many people with F30's/ ZF 8HP's chime in on this which makes me think it's not common. I scoured the internet and forums and didn't find anything about it except this thread, and one other, no definite info

I’m a little over 1 year into ownership of a ‘17 330iX purchased with 29,215KM (18,259 miles) and currently at 46,260KM (28,906 miles) and I felt the jolt perhaps 2-3 times over the course of the 1st 6 months but don’t recall specific circumstances. I will say I obviously noticed and it didn’t seem healthy or normal. Over the 2nd 6 months when parking without the hand brake I will engage N and ensure the vehicle is level before engaging P - when parking with the hand brake the vehicle is in D when I engage the hand brake and I ensure it’s holding (if I feel a slight roll I disengage and repeat) and haven’t had the jolt during that time frame.

[britexpatinusa]

Originally Posted by mikewhiskey

Yes, saw that, thank you.

I'm also a little surprised not many people with F30's/ ZF 8HP's chime in on this which makes me think it's not common. I scoured the internet and forums and didn't find anything about it except this thread, and one other, no definite info

Agreed. I have an F30 2018 and do NOT experience this issue. The car idles perfectly in hot or cold weather.

[shoman24v]

Originally Posted by britexpatinusa

Agreed. I have an F30 2018 and do NOT experience this issue. The car idles perfectly in hot or cold weather.

Just to clarify, this is an issue that happens on first start (roughly 1-2 seconds after the car starts) when the car is cold only, it is not an idle issue.

[shoman24v]

Alright, finally took the car in. Warranty is about to expire so they are going to check on it. Let's see what they say.

[shoman24v]

Finally, and update! Among a few other things I had problems with my car, I mentioned the cold start clunk.

Well, here is the repair. I have not checked this morning yet to see if it is fixed, but I will report back later today after I start my car to go to work. It is a little concerning the motor mounts were failing on a car I bought with barely 14k miles and now +19k miles.

Side note. There is a B46 recall on our 330i's that they did too.

"Replace the coolant vent line on cylinder head B17 01 25 as per recall SIB 17 01 21, replace coolant vent line."

Also, my kudos for my local dealership. They also took care of peeling rear steering wheel trim and replaced 2 front door seals for air leaking around the B-Pillar at speed with about 2 weeks of factory warranty left.

[oem.plus_440gc]

Did you mention the peeling of the steering wheel trim to them? Mine is doing the same. I have about 6 months of warranty left. I wasn't aware they would replace that under warranty. My steering wheel leather and the bolsters on my drivers seat both are also pretty worn for only 3 years old. I wonder if they would replace them too?

[shoman24v]

Originally Posted by oem.plus_440gc

Did you mention the peeling of the steering wheel trim to them? Mine is doing the same. I have about 6 months of warranty left. I wasn't aware they would replace that under warranty. My steering wheel leather and the bolsters on my drivers seat both are also pretty worn for only 3 years old. I wonder if they would replace them too?

Yeah, I did. In my opinion, just take it in for those issues. Might depend on your mileage though. I have only 19.4k miles. Could be different if you have 45k+ miles but who knows.

[mikewhiskey]

Originally Posted by shoman24v

Finally, and update! Among a few other things I had problems with my car, I mentioned the cold start clunk.

Well, here is the repair. I have not checked this morning yet to see if it is fixed, but I will report back later today after I start my car to go to work. It is a little concerning the motor mounts were failing on a car I bought with barely 14k miles and now +19k miles....

Thank you for the updates. I would be surprised if this is a motor mount issue (at least on my car, as the car bumps forward like the trans is briefly engaging forward gear after engine starts, only cold), looking forward to hearing if your car is fixed!

[shoman24v]

I think I was surprised too that they said motor mounts.

This unfortunately DID NOT fix the clunk with the new mounts now, it feels better when it does it lol.

Personally, I firmly believe it something to do with the programming of the transmission. And I am guessing it is some sort of self check as outlined with the E70 SIB 24 08 08 I have in post 10 about a self check.

In all honesty, I think it's just an annoyance we'll have to deal with.

[mikewhiskey]

Originally Posted by shoman24v

...Personally, I firmly believe it something to do with the programming of the transmission. And I am guessing it is some sort of self check as outlined with the E70 SIB 24 08 08 I have in post 10 about a self check...

I updated my EGS with the newest software, actually I updated all ECU's. No change.

I think theres something mechanically not right inside the trans.

[shoman24v]

Originally Posted by mikewhiskey

I updated my EGS with the newest software, actually I updated all ECU's. No change.

I think theres something mechanically not right inside the trans.

Isn't this the same trans used in practically every BMW? Only difference being tuning? I would have sworn I felt it once in our F25 X3 before I sold it.