Home Forums Articles How To's FAQ Register
Go Back   Xoutpost.com > BMW SAV Forums > X5 (E53) Forum
Arnott
User Name
Password
Member List Premier Membership Search Today's Posts Mark Forums Read

Xoutpost server transfer and maintenance is occurring....
Xoutpost is currently undergoing a planned server migration.... stay tuned for new developments.... sincerely, the management


Reply
 
LinkBack Thread Tools Display Modes
  #31  
Old 10-29-2017, 08:07 PM
Premier Member
 
Join Date: Jun 2015
Location: Southlake, Texas
Posts: 2,093
X53Jay4.8is is on a distinguished road
Quote:
Originally Posted by amancuso View Post
This thread seems like it died about a year ago. My new to me 4.8is w/ 83k miles seems like it shifts too quickly on moderate throttle (speed limit of 35-45) and to make it actually go it has to downshift. It also does something weird very rarely but has done it about 10 times over the past 3k miles. When traveling at lower speed, say 40, and I try to accelerate gingerly without stomping the pedal, it feels like the transmission shifts halfway, makes a whooshing sound then bumps into gear, almost like it's sliding before actually shifting into gear. I am getting the fluid changed along with that square adaptor, 4 small hoses and the electrical plug gasket changed, also checking the transmission programming and adaptations reset this weds. I guess my next step if this doesn't work is the solenoid or even whole mechatronics unit change?
You should change out the mechatronic unit when you open up the transmission.
Reply With Quote

Sponsored Links

  #32  
Old 10-29-2017, 10:23 PM
Member
 
Join Date: Aug 2010
Location: Burlington, NJ
Posts: 564
amancuso is on a distinguished road
Quote:
Originally Posted by X53Jay4.8is View Post
You should change out the mechatronic unit when you open up the transmission.


Thanks. Thatís the plan if this first service doesnít help.


Sent from my iPhone using Tapatalk
__________________
2004 4.8iS
Reply With Quote
  #33  
Old 10-29-2017, 10:44 PM
Member
 
Join Date: Dec 2016
Location: CA
Posts: 114
pearlpower is on a distinguished road
Quote:
Originally Posted by amancuso View Post
Thanks. Thatís the plan if this first service doesnít help.


Sent from my iPhone using Tapatalk
I am sure I am not too far off when stating that over 90% of these transmissions on the road have at least one bad solenoid. I would definitely swap the solenoids first along with the other items you mentioned. A rebuilt valve body also comes with new solenoids.
__________________
E53 X5 4.8is-Dinan S2-Street Brawler
E70 X5M-The stoplight shocker
AMG E55K-539 RWHP, 629RWTQ-my toy
GX470-the unbreakable truck.
F30 328i-JB4 STG 2. Daily MPG Work Beater
02-WS6, 6sp my other toy
...other stuff parked around here somewhere
Reply With Quote
  #34  
Old 11-02-2017, 01:16 PM
Member
 
Join Date: Aug 2010
Location: Burlington, NJ
Posts: 564
amancuso is on a distinguished road
Quote:
Originally Posted by desertfire View Post
Thanks All,

So, latest update....

Just got back from the Indie, Hugo's Euro Auto Repair in Carlsbad, CA, and Rick there dove into the transmission control. Turns out that the firmware is up to date and is matching the checksum of the input firmware image, so all is good there.

There were the following errors stored in the transmission control unit:
- There was one error of slippage between 3rd and 4th
- A fault on clutch pack E

There were no solenoid actuator errors and the test results came back clear for the operation of the Mechatronic.

He cleared the errors and I was on my way out and paid attention to a few details...

1. it seems that the transmission is "hunting" at the specific range of RPM's (~2700) between 3rd and 4th and it would seem to me that the system is trying to decide which of the gears to go with. At one point I had it actually flipping between the two gears constantly while going up hill at moderate gas.

2. When "coasting" under minimal power... like just the tip of gas to carry along... it seems that the transmission releases and engages the gear ever so slightly, but just noticeable.

3. It seems that the engine is choking under load at times... especially when the transmission is upshifting through its gears when under minimal application of accelerator. I would almost assume the system has no idea of where the accelerator is at. Usually I would think of this as a throttle position sensor or MAF sensor not responding, but the system has no indication of this being the issue.


If I were to look at this from a mechanical perspective, I'd say that the hydraulic system is not able to maintain a consistent fluid pressure when spinning under low RPMs, but, if that were the case, wouldn't the system slip when cruising at ~2500 RPM in 6th along the freeway especially uphill?

Also, why does the system seem to work that much better when hitting the throttle just past the ~3k RPM point?
I have the EXACT same symptoms and error codes. Hoping a refreshed valve body and solenoids will fix my issue.
Reply With Quote
  #35  
Old 11-06-2017, 06:49 PM
Member
 
Join Date: Aug 2010
Location: Burlington, NJ
Posts: 564
amancuso is on a distinguished road
Good news to report. The reman'd valve body w/new solenoids fixed the X! It shifts like a new car, no more weirdness, clunking or bumping. Also shifts instantly from P to R or D. No more transfailsafe! Very pleased.
Reply With Quote
  #36  
Old 11-07-2017, 10:50 AM
crystalworks's Avatar
Premier Member
 
Join Date: Jun 2014
Location: SA, TX
Posts: 3,789
crystalworks is on a distinguished road
Quote:
Originally Posted by amancuso View Post
Good news to report. The reman'd valve body w/new solenoids fixed the X! It shifts like a new car, no more weirdness, clunking or bumping. Also shifts instantly from P to R or D. No more transfailsafe! Very pleased.
Awesome! Where did you buy your solenoids? Mine is still shifting fine (though it is aggressive, wonder if that's the Dinan programming) but would be nice to know of the source for the new parts when the time arises.
__________________
2005 X5 4.4i Build 04/05 Maintenance/Build Log
Nav, Pano, Sport (Purchased 06/14 w/ 109,000 miles) (Sold 8/15 w/121,000 miles)


2006 X5 4.8is Build 11/05 Maintenance/Build Log
Nav, DSP, Pano, Running Boards, OEM Tow Hitch, Cold Weather Pckg (Purchased 08/15 w/ 90,500 miles)

2010 X5 35d Build 02/10
Nav, HiFi, 6 DVD, Sports Pckg, Cold Weather Pckg, HUD, CAS, Running Boards, Leather Dash, PDC, Pano (Purchased 03/17 w/ 136,120 miles)
Reply With Quote
  #37  
Old 11-07-2017, 11:38 AM
Member
 
Join Date: Aug 2010
Location: Burlington, NJ
Posts: 564
amancuso is on a distinguished road
I didn't buy just the solenoids, I bought a remanufactured valve body complete with new solenoids. The VB is upgraded with new internal bits to prevent the failures. I bought it from https://revmaxconverters.com/product...y-mechatronic/


Al.
Reply With Quote
  #38  
Old 11-07-2017, 07:05 PM
crystalworks's Avatar
Premier Member
 
Join Date: Jun 2014
Location: SA, TX
Posts: 3,789
crystalworks is on a distinguished road
Quote:
Originally Posted by amancuso View Post
I didn't buy just the solenoids, I bought a remanufactured valve body complete with new solenoids. The VB is upgraded with new internal bits to prevent the failures. I bought it from https://revmaxconverters.com/product...y-mechatronic/


Al.
Bookmarking that for future reference. Thanks a ton. That's not cheap, but it's a helluva a lot cheaper than a new transmission or rebuilding one.
__________________
2005 X5 4.4i Build 04/05 Maintenance/Build Log
Nav, Pano, Sport (Purchased 06/14 w/ 109,000 miles) (Sold 8/15 w/121,000 miles)


2006 X5 4.8is Build 11/05 Maintenance/Build Log
Nav, DSP, Pano, Running Boards, OEM Tow Hitch, Cold Weather Pckg (Purchased 08/15 w/ 90,500 miles)

2010 X5 35d Build 02/10
Nav, HiFi, 6 DVD, Sports Pckg, Cold Weather Pckg, HUD, CAS, Running Boards, Leather Dash, PDC, Pano (Purchased 03/17 w/ 136,120 miles)
Reply With Quote
  #39  
Old 11-07-2017, 07:40 PM
Member
 
Join Date: Aug 2010
Location: Burlington, NJ
Posts: 564
amancuso is on a distinguished road
Quote:
Originally Posted by crystalworks View Post
Bookmarking that for future reference. Thanks a ton. That's not cheap, but it's a helluva a lot cheaper than a new transmission or rebuilding one.
You're welcome! Driving it now is like night and day difference. Well worth it, and we plan on keeping the truck for many many miles.
Reply With Quote
  #40  
Old 01-01-2018, 06:46 PM
Member
 
Join Date: Apr 2016
Location: Montgomery, AL
Posts: 13
Domino1968 is on a distinguished road
Quote:
Originally Posted by amancuso View Post
You're welcome! Driving it now is like night and day difference. Well worth it, and we plan on keeping the truck for many many miles.
Amancuso, what was the turn around time for sending/getting your valve body done. Any details on working with Revmax would be appreciated since I am ready to pull the trigger to get my valve body done. I have it out already and want to know if I should rebuild myself with a Sonnax zip kit or have Revmax do it like yours.
__________________
2006 X5 4.4i
Reply With Quote
Reply

Bookmarks

Tags
failsafe, shift, slip, transmission

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On





All times are GMT -4. The time now is 06:23 AM.
vBulletin, Copyright 2019, Jelsoft Enterprises Ltd. SEO by vBSEO 3.6.0
© 2017 Xoutpost.com. All rights reserved. Xoutpost.com is a private enthusiast site not associated with BMW AG.
The BMW name, marks, M stripe logo, and Roundel logo as well as X3, X5 and X6 designations used in the pages of this Web Site are the property of BMW AG.
This web site is not sponsored or affiliated in any way with BMW AG or any of its subsidiaries.