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X3 F25 (2011 - current)
The latest X3 brings some added style and some new features to the BMW SUV family. Talk about the new F25 now!

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  #1  
Old 03-25-2013, 07:40 PM
csmcphail csmcphail is offline
2011 X3 35i
Location: Upstate NY
 
Join Date: Jul 2012
Posts: 31
Mein Auto: 2011 X3 35i
Exclamation X3 35i (N55) Low Speed Hesitation Revised and Final Fix

SI B24 02 12 did not work for me. See email below, which resulted in a productive exchange with an excellent Gault BMW customer service rep (Dave Belknapp) and a BMW field engineering rep. The more current service bulletin SI B12 09 12 was performed. I took our car on an urban road trip and the throttle now acts more like a mechanical linkage...no more 'requests to the department of engines and transmissions for consideration of acceleration needs'. In my opinion, the Nov 2012 fix described in the attached bulletin SI B12 09 12 works indeed!

**************************HISTORY***************** *******
Ref: VIN: xxx, Production #yyy, Miles appx:11,600

Dear BMW Customer Relations:

My wife and I love many aspects of our 2011 X3 35i. We had an absolute blast at the Performance Center Delivery in the Fall of 2011!

There is a significant, persistent issue that has not been resolved to our satisfaction, despite 2 service appointments. Throttle behavior at low speed is unpredictable and erratic to a degree that it keeps me on edge. My wife now looks for reasons to not drive the car. It is very difficult for either of us to perform gentle throttle manipulations at low speed without the car either momentarily hesitating or shooting off like a rocket. Likewise, when slowing down and then resuming posted speeds in situations like slowing for a traffic light transitioning from red to green, there is a similar difficulty predicting what will result from gentle throttle inputs. In other scenarios, the engine is a marvelous and velvety smooth beast.

Back in April 2012, we had the following update performed at Gault BMW in Endicott NY:
“A new software calibration was just released for this engine:
SI B24 02 12
Subject:
N52T/N55 with 8HP45: Delay in Engine Response
Model
F25 with either N52T or N55 engines and 8HP45 transmission up to 1/16/2012
Situation
When slowing down to lower suburban road speeds and then reaccelerating, a delay in engine response may be experienced
Cause
Unfavorable EGS and DME software calibration
Correction
Program the vehicle using ISTA/P 2.46.0 or higher”

In October, we took the car back to Gault BMW. The friendly service staff and technicians could not find any codes and confirmed the SW update was correctly performed back in April. Again, they were very professional and supportive, but were unable to solve the problem. We’ve been Acura customers since the mid-1990’s and decided to give BMW a try last year. There is so much to love about our X3, but this problem is a definite sore spot. We would greatly appreciate if BMW would get to the root cause of this problem.

Sincerely,

zzzzzz"
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  #2  
Old 03-26-2013, 11:32 AM
gfeiner's Avatar
gfeiner gfeiner is offline
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Location: Houston, TX
 
Join Date: Jun 2003
Posts: 540
Mein Auto: 2012 X3 xDrive35i
Good to hear. Now only if they would fix the cold start rattle problem.
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  #3  
Old 03-26-2013, 02:52 PM
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Teemo Panda Teemo Panda is offline
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Location: New Jersey
 
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Mein Auto: E53, E46-M3, E70, F25-X3
Quote:
Originally Posted by gfeiner View Post
Good to hear. Now only if they would fix the cold start rattle problem.
Why is that a bad problem?
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  #4  
Old 03-26-2013, 03:43 PM
gfeiner's Avatar
gfeiner gfeiner is offline
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Location: Houston, TX
 
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Posts: 540
Mein Auto: 2012 X3 xDrive35i
Quote:
Originally Posted by kamigawa120 View Post
Why is that a bad problem?
Until they figure out the cause of the noise, we don't know if it is a sign of something serious. The sound itself is embarrassing. It makes a $50k car sound like $500 junker. It has turned heads when starting up in a parking garage.
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  #5  
Old 03-26-2013, 03:50 PM
Want the Thrill Want the Thrill is offline
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Location: Michigan
 
Join Date: Sep 2009
Posts: 970
Mein Auto: 2011 X3 35i
Quote:
Originally Posted by gfeiner View Post
Until they figure out the cause of the noise, we don't know if it is a sign of something serious. The sound itself is embarrassing. It makes a $50k car sound like $500 junker. It has turned heads when starting up in a parking garage.
That doesn't sound normal. Mine does not rattle upon start up. Have you compared yours to other X3's on their lot?
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  #6  
Old 03-26-2013, 05:29 PM
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gfeiner gfeiner is offline
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Location: Houston, TX
 
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Posts: 540
Mein Auto: 2012 X3 xDrive35i
Quote:
Originally Posted by Want the Thrill View Post
That doesn't sound normal. Mine does not rattle upon start up. Have you compared yours to other X3's on their lot?
No. But others with the 2012 X3 35i have. It's only cold starts and lasts for 10-15 seconds. It's so brief i havent been able to narrow down the exact loaction of the aound. It's easy to miss if you are not next to a wall or in a garage when you start up cold. Here is the thread:
http://www.bimmerfest.com/forums/sho...ght=cold+start

Last edited by gfeiner; 03-27-2013 at 05:48 AM.
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  #7  
Old 03-26-2013, 06:40 PM
c3uo c3uo is offline
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Location: Canada
 
Join Date: Jul 2006
Posts: 30
Mein Auto: Audi
I have the same noise. It's definitely wastegate rattle.

I'm anxious to see if the SIB fixes the throttle tip-in issue. I can (begrudgingly) live with the wastegate noise at cold start.
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  #8  
Old 04-05-2013, 07:44 PM
csmcphail csmcphail is offline
2011 X3 35i
Location: Upstate NY
 
Join Date: Jul 2012
Posts: 31
Mein Auto: 2011 X3 35i
Still happy with hesitation fix

Approaching two weeks driving since first post and still pleased.
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  #9  
Old 05-16-2013, 07:19 PM
csmcphail csmcphail is offline
2011 X3 35i
Location: Upstate NY
 
Join Date: Jul 2012
Posts: 31
Mein Auto: 2011 X3 35i
6 Weeks, still working!
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  #10  
Old 05-16-2013, 07:58 PM
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lbjgh lbjgh is offline
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Location: North of Toronto
 
Join Date: Dec 2011
Posts: 710
Mein Auto: 2013 X3 M-Sport
I came close to not buying the x3 after test driving the x3. I loved everything about its performance with the exception of the throttle delay fault. In the end I chose the x3 over other cars and searched for third party fixes for the issue while waiting for delivery. Sprintbooster had a fix for the design fault but fortunately my my2013 had the corrected throttle mapping. [ hope BMW fired someone over that substandard engineering.

Here is a video of the sprintbooster I was going to buy if my car was delivered with the fault,



Quote:
Originally Posted by csmcphail View Post
6 Weeks, still working!

Last edited by lbjgh; 05-16-2013 at 07:59 PM.
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  #11  
Old 08-18-2013, 01:49 PM
m3bs m3bs is offline
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Mein Auto: '02 330i, '95 M3
Coming in late to this party, but I just found this thread.

My wife's X3 was made in April 2012, so it should have the later software. I don't drive it often, but the tip-in delay drives me nuts every time I do. My poor dogs are tired of being tossed around in their crate! I'm definitely going to inquire about this service bulletin when I take it in for the oil service in a few weeks.
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  #12  
Old 08-18-2013, 03:29 PM
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lbjgh lbjgh is offline
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Location: North of Toronto
 
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Posts: 710
Mein Auto: 2013 X3 M-Sport
Many X3 owners 'learn' to drive with the fault but as you pointed out other drivers who are use to proper throttle mapping really find the fault annoying. Let's hope the dealership updates the mapping on your car.

Quote:
Originally Posted by m3bs View Post
Coming in late to this party, but I just found this thread.

My wife's X3 was made in April 2012, so it should have the later software. I don't drive it often, but the tip-in delay drives me nuts every time I do. My poor dogs are tired of being tossed around in their crate! I'm definitely going to inquire about this service bulletin when I take it in for the oil service in a few weeks.
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