Acceleration stumble at highway speed Help!

[daytona90t]

That sounds very reasonable. I bet they have cookies in the waiting area too.

BMW of Sudbury is really fancy, they also have croissants and cappuccino.

Grab a cookie and coffee, then hoon the loaner.

Definitely will, right after I put it in sport mode. I hate that they all seem to default to Eco+

Sorry that didn't help. About 1 hour of labor sounds about right. I hope that sorts it.

Not a problem! I appreciate the suggestion, always good to build a definitive list of what isn't the problem.

[daytona90t]

I tried something today to try to better understand the different driving modes that the DME is programed for. I drove to work in D mode and was able to create the 2,800 rpm stumble every time. It is very noticeable in D. I drove half way home in S mode and the stumble is still there but much less pronounced. I drove the rest of the way in M mode and was able to floor it and click through every gear without any stumble at all. I wonder if when in D and S mode the DME goes into a sort of high speed cruise mode for better fuel mileage and perhaps goes a little lean, and in M mode it is instead always ready for you to ask it for more, and not worried about fuel mileage, keeping the fuel maps the same as in lower gears. Just an observation and some ideas. My brain is incapable of not trying to figure this out.

[TheFinanceGuy]

Steve - let me how this goes. I'm having this issue as well right at the 2,800 mark. I've tried just about everything I can to get rid of it. Including sharking it!
My DME was updated according to my local tech. I honestly never thought about bring it to BMW of Sudbury for this.

BTW - will you be at their cars and coffee on May 7th?
http://www.herbchamberscarsandcoffee.com/

[anandoc]

I tried something today to try to better understand the different driving modes that the DME is programed for. I drove to work in D mode and was able to create the 2,800 rpm stumble every time. It is very noticeable in D. I drove half way home in S mode and the stumble is still there but much less pronounced. I drove the rest of the way in M mode and was able to floor it and click through every gear without any stumble at all. I wonder if when in D and S mode the DME goes into a sort of high speed cruise mode for better fuel mileage and perhaps goes a little lean, and in M mode it is instead always ready for you to ask it for more, and not worried about fuel mileage, keeping the fuel maps the same as in lower gears. Just an observation and some ideas. My brain is incapable of not trying to figure this out.

Your theory does make sense. I have similar observations - the 2800 stumble is less pronounced in M/S modes.

I feel that in the S mode, the gears are held longer and it downshifts much more readily as soon as you hit the gas, the stumble is less noticeable. Haven't really tried to drive much in M mode to reproduce this issue.

It might help if we have a member here with a automatic and the later DME version to chime in...

[terraphantm]

Your DME is already on the latest software. 7561382 refers to the "program" version and 7561520 is the "calibration". 7561382 is the newest program available, and the calibration is likely one of the ZHP-specific ones already.

[daytona90t]

Steve - let me how this goes. I'm having this issue as well right at the 2,800 mark. I've tried just about everything I can to get rid of it. Including sharking it!
My DME was updated according to my local tech. I honestly never thought about bring it to BMW of Sudbury for this.

BTW - will you be at their cars and coffee on May 7th?
http://www.herbchamberscarsandcoffee.com/

I bring both the zhp and the X3 to Sudbury for small stuff that I can't or don't want to do myself, like alignments and the occasional oil change. I have found that this helps keep a good rapport going for when I need things like a DME update. It's also nice to get to drive a loaner one and a while. I didn't buy either car from them but they have been great and treat me like I did.

I would like to go to the cars and coffee event, but I think that my wife has to work that morning and I doubt that I can get the 10 month old out of the house that early.

[daytona90t]

Your DME is already on the latest software. 7561382 refers to the "program" version and 7561520 is the "calibration". 7561382 is the newest program available, and the calibration is likely one of the ZHP-specific ones already.

If this is the case, do you know how to check the "calibration" version with either my handheld carsoft scanner or the P.A. Soft BMW scanner 1.4?

I was trying to use RealOEM to verify the latest version and this is what I was able to find.

For vehicles with Performance Package S767A=Yes
01 RMFD control unit DME programmed MS45.1 03/2003 07/2004 12147561520

12147561520
RMFD control unit DME programmed MS45.1

Supersedes:

12147542993 (09/01/2005 — 09/01/2005), Exchangeable retrospectively
12147549087 (09/01/2004 — 09/01/2005), Exchangeable retrospectively
12147548580 (08/01/2004 — 08/30/2004), Exchangeable retrospectively
12147547799 (07/01/2004 — 08/10/2004), Exchangeable retrospectively
12147546938 (07/01/2004 — 07/22/2004), Exchangeable retrospectively
12147537241 (03/29/2004 — 07/06/2004), Exchangeable retrospectively
12147540382 (12/01/2003 — 04/20/2004), Exchangeable retrospectively
12147537792 (12/01/2003 — 12/01/2003), Exchangeable retrospectively
12147536841 (08/01/2003 — 12/01/2003), Exchangeable retrospectively
12147533695 (07/01/2003 — 08/08/2003), Exchangeable retrospectively
12147532778 (05/01/2003 — 07/10/2003), Exchangeable retrospectively
12147531907 (02/21/2003 — 06/10/2003), Exchangeable retrospectively
12147531491 (03/01/2003 — 02/24/2003), Exchangeable retrospectively
12147530214 (03/01/2003 — 02/18/2003)

Part 12147561520 was found on the following vehicles:
3' E46   (09/1999 — 08/2006)

[TheFinanceGuy]

I bring both the zhp and the X3 to Sudbury for small stuff that I can't or don't want to do myself, like alignments and the occasional oil change. I have found that this helps keep a good rapport going for when I need things like a DME update. It's also nice to get to drive a loaner one and a while. I didn't but either car from them but they have been great and treat me like i did.

I would like to go to the cars and coffee event, but I think that my wife has to work that morning and I doubt that I can get the 10 month old out of the house that early.

Its a perfect for the baby! I used to bring them when they were little, not at 2 and 4 - they want to stay in bed - which I am not going to complain about!

I use a shop near me for the stuff, for the same reason. He is/was a BMW certified tech that opened his own shop.

[terraphantm]

If this is the case, do you know how to check the "calibration" version with either my handheld carsoft scanner or the P.A. Soft BMW scanner 1.4?

I was trying to use RealOEM to verify the latest version and this is what I was able to find.

For vehicles with Performance Package S767A=Yes
01 RMFD control unit DME programmed MS45.1 03/2003 07/2004 12147561520

12147561520
RMFD control unit DME programmed MS45.1

Supersedes:

12147542993 (09/01/2005 — 09/01/2005), Exchangeable retrospectively
12147549087 (09/01/2004 — 09/01/2005), Exchangeable retrospectively
12147548580 (08/01/2004 — 08/30/2004), Exchangeable retrospectively
12147547799 (07/01/2004 — 08/10/2004), Exchangeable retrospectively
12147546938 (07/01/2004 — 07/22/2004), Exchangeable retrospectively
12147537241 (03/29/2004 — 07/06/2004), Exchangeable retrospectively
12147540382 (12/01/2003 — 04/20/2004), Exchangeable retrospectively
12147537792 (12/01/2003 — 12/01/2003), Exchangeable retrospectively
12147536841 (08/01/2003 — 12/01/2003), Exchangeable retrospectively
12147533695 (07/01/2003 — 08/08/2003), Exchangeable retrospectively
12147532778 (05/01/2003 — 07/10/2003), Exchangeable retrospectively
12147531907 (02/21/2003 — 06/10/2003), Exchangeable retrospectively
12147531491 (03/01/2003 — 02/24/2003), Exchangeable retrospectively
12147530214 (03/01/2003 — 02/18/2003)

Part 12147561520 was found on the following vehicles:
3' E46   (09/1999 — 08/2006)

7561544 is the so-called "New Jersey" flash which is why mine shows that instead of 7561520 or 7561522. Nonetheless, if your DME is reporting 7561382 (notice that matches my "BMWTNR"), you're on the latest software.

[daytona90t]

Wow! That may be the most detailed response I have ever received on a forum, Thank you. I will check again this weekend and go into the "User info fields" to check my assembly number. I was honestly always terrified to drill into the "Reprogramming" under the DME section, lots of good info in there. Thanks again, I would hate to pay $145 for them to just tell me that I was already as up to date as possible.