[DuneMan]

Go to your dealer and get a SW update. It will solve the problem.

[mspeasl]

Originally Posted by DuneMan

Go to your dealer and get a SW update. It will solve the problem.

I don't want to sound dumb here, but what is an SW update..?

Thanks,

[DuneMan]

Fom what I understand cars nowadays are run by computer systems that control everything in your car from the sound system to the fule regulator.

Your dealer will hook up your car to an external computer to see what part of your system requires an update (e.g transmission update or steering update)... sometimes they will do a full update if they see fit. These system updates are called SW updates.

[Grover432]

Are the 550i models having the same problem. I just test drove on yesterday in So CA in stop and go traffic and it seemed fine. I then drove a 535i and found it to be uneven as it was accelerating rapidly.

[pharding]

My 550i is fine.

[DuneMan]

Originally Posted by Grover432

Are the 550i models having the same problem. I just test drove on yesterday in So CA in stop and go traffic and it seemed fine. I then drove a 535i and found it to be uneven as it was accelerating rapidly.

There was a high profile recall by BMW recently for all x35 Engines (135i, 335i, 535i...) years 2007 to 2010.

http://abcnews.go.com/TheLaw/bmw-adm...ry?id=11968495


The problem was in the fuel pump. So, it appears that BMW was having a problem with 35 engines only.

Given that, I don't doubt too much that some F10 535's might be having a similar problem.

[algoodman]

Originally Posted by DuneMan

There was a high profile recall by BMW recently for all x35 Engines (135i, 335i, 535i...) years 2007 to 2010.

http://abcnews.go.com/TheLaw/bmw-adm...ry?id=11968495


The problem was in the fuel pump. So, it appears that BMW was having a problem with 35 engines only.

Given that, I don't doubt too much that some F10 535's might be having a similar problem.

Those were the N54 engines. 2011 F10's have the N55 engines and there have been very few reports of HPFP problems with those engines.

[RC3]

Have my 528i for 3 weeks now and 1,000km so far. It hesitates and jerks during stop and go situation. Don't know if this go away after break-in.

Any updates from fellow members here? Don't know if I should take it back to dealer for checking now.

[JOHNBMWM5]

Originally Posted by Grover432

Are the 550i models having the same problem. I just test drove on yesterday in So CA in stop and go traffic and it seemed fine. I then drove a 535i and found it to be uneven as it was accelerating rapidly.

My 550i M Sport is lightning quick from tick over, no hesitation if anything we have to be careful not to blast into the cars in front.

[DChaffins]

I know many of us are looking for a software update to solve this issue, but something keeps nagging at me. I am told my software is up-to-date. If so, since we all have the same transmission wouldn't all 5's have the problem? It seems to me that if I have the latest software, the problem must be with something else.

[DuneMan]

I had some type of software update and it felt fine for about 2 weeks and then is started again... now it's much worse than before. The delay seems greater and the shifting between gears is very slow now, it feels like manual transmission.

Today i started thinking of selling the car. These issues are just taking too much of my time.

[DuneMan]

by the way... i think the technical term for this problem is called "Turbo Lag"
Google it to learn more.


Also, I found this review which mentions the hesitation and jerking in the F10 535.

http://www.cars.com/bmw/535/2011/reviews/

[grimlock]

Originally Posted by DuneMan

by the way... i think the technical term for this problem is called "Turbo Lag"
Google it to learn more.


Also, I found this review which mentions the hesitation and jerking in the F10 535.

http://www.cars.com/bmw/535/2011/reviews/

Some have reported it on their non-turbo cars well..
Try feathering the throttle, to make sure its the car and not you

[Nirvana]

Hi,

Some posts on this thread in January, including mine, went missing.

My car has the same problem. I consider this to be a major fault which is also a serious compromise to safety since the acceleration is very unpredictable.

Instead of accepting this nonsense, let's gather a list of owners with the same problem and demand an immediate remedy from BMW, and copying some interested media in the process.

I am willing to take the lead on this and am confident we can gather a sizable list of owners if we spread the message around.

[kel3]

nothing on mine...

[Salter]

Quick update: I experience a "kick" or a "jolt" (always at around 8KM/h). A couple of weeks ago, the dealership acknowledged the problem. After a few days in the shop, during which they consulted with BMW HQ engineers, it was decided to replace the transmission's "mechatronic valve" (now waiting for the part). I was also told that if this will not work, the complete transmission system may need to be replaced. I was also told that SW update was not relevant in this case.

As an aside, I am note sure that all posts and symptoms described in this thread are necessarily related to one single problem. So this current path to solution may not be relevant to all who posted here. I'll provide an update once I know more.

[ghueser]

Originally Posted by DuneMan

by the way... i think the technical term for this problem is called "Turbo Lag"
Google it to learn more.


Also, I found this review which mentions the hesitation and jerking in the F10 535.

http://www.cars.com/bmw/535/2011/reviews/

These complaints are all so low in the RPM range that I highly doubt that the Turbo has anything to do with it. It could be I guess, but based on prior ownership of other Turbo cars, this does not feel anything like Turbo lag to me.

Those that have been told they got a Software Update are probably only getting a computer reset so the transmission and engine can learn all over again. In most cases, this makes the car seemingly drive a lot better.

So why does it get worse? Most likely because the software is trying to get to an optimal gas mileage, and has the use of eight gears to do so, with a torque band that starts very low in the RPM range. The result is that it ends up making the car shift at least 2 gears from stop.....even before going through an intersection.

I would still bet (hope) that BMW is working on a fix, they know about the situation from their Dealers, the Forums on the internet, and from Car Magazines that have all reported on the same situation. I think Road and Track coined the issue as a 1-2 mis-step. If they are working a fix, it will take time, since they probably have to work on both the Engine Management and Transmission module software. (All along with the goal of maintaining the gas mileage they need to have.)

Over time, and a couple of my own resets of the software, the issue had diminished somewhat. Maybe by alterring my gas pedal action, I don't really know. What is more of an issue with me however is at highway speed, where I wish the car was at a little higher RPM, and a little deeper into the torque band for the engine. Once again, the reasult of trying to make the best gas mileage............which is obviosuly not a bad goal, but does dminish the car expereince somewhat.

[delvek]

Originally Posted by DChaffins

If so, since we all have the same transmission wouldn't all 5's have the problem?

There are different transmissions. Even the 8spd auto, has the regular 8spd auto and the Sport 8spd auto.

[ghueser]

Originally Posted by delvek

There are different transmissions. Even the 8spd auto, has the regular 8spd auto and the Sport 8spd auto.

Technically, there are two auto transmissions for the F10, one is for the
528i /535i (GA8HP45Z) and one for the 550i (GA8HP70Z) Most likely the difference is in the Torque Converters used for each engine. For each car however, they are the same...sport or non sport. Sport just uses different programming to adjust when the car shifts. Check Real OEM.

[kel3]

Sport 8spd auto for me with no problems, so far.... fingers crossed

[SteVTEC]

Does it matter if the transmission is in D or DS mode? It sounds like it might be getting confused as to whether it should be starting out in 1st or 2nd gear. I noticed a little lag/jerk on the 535i on test drive, but not on the 528i. But I think I was driving the 528i in DS mode where it always starts in 1st gear, right? I believe when I noticed the lag/jerk in the 535i I probably had it in regular D mode. Maybe it was in 2nd, but decided to start from 1st and that's what resulted in the lag and jerk. Since both turbo and non-turbo F10 owners have noticed it, yeah it has nothing to do with turbo lag or anything of that nature.

[ghueser]

Originally Posted by SteVTEC

Does it matter if the transmission is in D or DS mode? It sounds like it might be getting confused as to whether it should be starting out in 1st or 2nd gear. I noticed a little lag/jerk on the 535i on test drive, but not on the 528i. But I think I was driving the 528i in DS mode where it always starts in 1st gear, right? I believe when I noticed the lag/jerk in the 535i I probably had it in regular D mode. Maybe it was in 2nd, but decided to start from 1st and that's what resulted in the lag and jerk. Since both turbo and non-turbo F10 owners have noticed it, yeah it has nothing to do with turbo lag or anything of that nature.

Does not matter if you use D or DS. What DS ususally does is to delay shifts allowing the engine to go to higher revs in that mode. I believe both start in first no matter what, its just that you will probably see a shift at higher RPM when in DS. I do personally notice that the shifting is more like my old E39, when I keep the car in DS mode.