Engine acceleration when braking

TSB= technical service bulletin

The TSB is 12-04-12. Here is what it reads:

SUBJECT
N55: Idle Fluctuates Briefly After a Cold Engine Start
MODEL
E70, E71 with the N55 engine from 4/2010 (SOP) to 10/2011
F07 with the N55 engine from 3/2010 (SOP) to 12/2011
F10, F12, and F13 with the N55 engine from 3/2010 (SOP) to 12/2011
F25 with the N55 engine from 7/2010 (SOP) to 12/2011
SITUATION
Under certain engine cold starts, the engine idle may fluctuate during the first 10-20 seconds of operation before
becoming stable.
No faults will be stored in this situation, which will usually only occur at specific engine temperatures, making
it difficult to reproduce in the workshop.
CAUSE
Unfavorable DME software calibration
CORRECTION
Program the vehicle using the most current version of ISTA/P.
The corrected DME calibration was introduced as listed below:
E70, E71 N55 E070-11-09-505
F07 N55 F001-11-09-507
F10, F12, F13 N55 F010-11-09-507
F25 N55 F025-11-09-507
Note that ISTA/P will automatically reprogram and code all programmable control modules that do not have the
latest software.

Hey Knox, I'm glad the brakes appear to be working better now.... perhaps the pads are seated with the rotors.

A TSB is a technical service bulletin and they can be found here: http://www-odi.nhtsa.dot.gov/cars/pr.../tsbsearch.cfm

There is nothing on 2013 models but 2012 have some results.

OK I know a few will bash me about placement of the foot on both the brake and accelerator petal, but it has happened to me three times since I bought my car in Aug 2012.

Each time I was slowing down behind a car approaching a stoplight. This last time the car surged so hard that all the packages on the front seat hit the floor when I hit the brakes hard. The first time it happended I hit the stop button and braked. The 2nd and 3rd time the engine went to idle within a second as the excellent brakes and my quick response stoped forward movement avoiding collisions.

This third time I know for sure my foot was well placed on brake. I am wondering if the ECU is doing something funky with the throttle or if turbo malfunction is ramping up RPMs.

Any suggestions on what to do please for this new owner of a truely awesome car.

Originally Posted by German Steel

OK I know a few will bash me about placement of the foot on both the brake and accelerator petal, but it has happened to me three times since I bought my car in Aug 2012.

Each time I was slowing down behind a car approaching a stoplight. This last time the car surged so hard that all the packages on the front seat hit the floor when I hit the brakes hard. The first time it happended I hit the stop button and braked. The 2nd and 3rd time the engine went to idle within a second as the excellent brakes and my quick response stoped forward movement avoiding collisions.

This third time I know for sure my foot was well placed on brake. I am wondering if the ECU is doing something funky with the throttle or if turbo malfunction is ramping up RPMs.

Any suggestions on what to do please for this new owner of a truely awesome car.

2008 535xi? Wrong forum? Try dealer service?

I have a large number of issues with my X5 but this week experienced the issue of the engine revving and moving forward while my foot was firmly on the brake. I happened to be at the drop off line at my son's school and luckily no one was injured. This is my third X5 and my foot was solely on the brake and it was firmly down. The dealer has no idea why this happened but did tell me they had a car in with a similar incident a few weeks prior and that person had ended up rear ending another car.

Originally Posted by X5leaser

I have a large number of issues with my X5 but this week experienced the issue of the engine revving and moving forward while my foot was firmly on the brake. I happened to be at the drop off line at my son's school and luckily no one was injured. This is my third X5 and my foot was solely on the brake and it was firmly down. The dealer has no idea why this happened but did tell me they had a car in with a similar incident a few weeks prior and that person had ended up rear ending another car.

You posted this on the current generation X3 forum. You may want to post this over on the X5 forum here:

http://www.bimmerfest.com/forums/forumdisplay.php?f=159

Originally Posted by Want the Thrill

You posted this on the current generation X3 forum. You may want to post this over on the X5 forum here:

http://www.bimmerfest.com/forums/forumdisplay.php?f=159

I hate to seem simplistic, but I had the same problem when I wore work boots and it never happens when I wear dress shoes or tennis shoes.

Seriously consider that your foot is too big and hitting both the accelerator and brake at the same time.