Home Forums Articles How To's FAQ Register
Go Back   Xoutpost.com > BMW SAV Forums > X5 (E53) Forum
Fluid Motor Union
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
  #1  
Old 11-11-2020, 01:04 AM
Member
 
Join Date: Jan 2017
Location: Chicago
Posts: 524
Purplecty is on a distinguished road
4.6iS Torque Converter

Anyone familiar with the notorious 4.6iS torque converter issues? I started getting the TC error a few months ago and I could clear it and would come back a few weeks later but it will now pop back up either the same day it's cleared and driven or possibly the next day. The trans shifts flawlessly and I couldn't tell you there is any performance issues I could notice. I do have a rebuilt 4.6iS TC ready to go so it doesn't sit on the lift more than a day along with real crank seal, rear coolant cover gasket, torque converter seal and new exhaust bolts. Any other experience or recommendations I can use?
__________________
02 Imola on Black Dinan S2 4.6iS
00 RoyalRot on Sand/Black 740i Short Sport
Reply With Quote

Sponsored Links

  #2  
Old 11-11-2020, 09:27 AM
Member
 
Join Date: Jan 2020
Location: Houston TX
Posts: 24
Nolimite39 is on a distinguished road
1. How old is your fluid and are your trans cooler/t-stat operating properly?
2. Is the trans fluid at the correct level?
3. No vehicle speed is shown on the INPA readout, this would be helpful in determining whether the issue is likely fluid related or clutch related.

It seems at the time of the fault your fluid temp is perfect but if it has been overheated before it could have lost viscosity. Please take what I say with a grain of salt because the auto driveline is my weakest point when it comes to automotive knowledge. I'm going off theoretical (book) knowledge not first hand experience when it comes to autos.
Reply With Quote
  #3  
Old 11-11-2020, 10:35 AM
Member
 
Join Date: Jan 2017
Location: Chicago
Posts: 524
Purplecty is on a distinguished road
The error popped up on 8.20.2020. The Trans fluid and filter has been changed since then on 9.2.2020 which appeared to be the first time it was ever done. The trans shifts buttery smooth and had Dinan software but I still get the TC error most often. A friend with experience with 4.6s says the only way to properly get rid of the error is to swap the TC which he has had to do on the many 4.6s he has owned as it is a common failure point...
__________________
02 Imola on Black Dinan S2 4.6iS
00 RoyalRot on Sand/Black 740i Short Sport
Reply With Quote
  #4  
Old 11-11-2020, 11:52 AM
Member
 
Join Date: Jan 2020
Location: Houston TX
Posts: 24
Nolimite39 is on a distinguished road
Like I said most of my knowledge on the subject is based on books. That said, any torque converter basically has 3 failure points:
1. The stator or impeller blades or turbine blades self destruct which is a catastrophic failure and your car will go nowhere.
2. The clutch fails to lockup, in this case the car will drive but your MPGs will decrease noticeable as well as the cruising behavior.
3. Or the fluid is out of spec either in volume, temperature, or viscosity.

#1 most certainly require a replacement and since you're vehicle is still mobile this can be ruled out.
#2 could be an electronic issue if the lockup is electronically controlled, which on the 4.6is it is. Replacing the electronics in this system is a hell of a lot cheaper and less labor intensive than replacing the converter so it is recommended that the time be taken to properly diagnose the root cause of the issue.
#3 is self explanatory and as long as the fluid change was done properly with the trans being warmed up, shifted, driven, and level checked/topped off then this has been ruled out as well.

Check out this thread:

https://xoutpost.com/bmw-sav-forums/...stuck-off.html

Last edited by Nolimite39; 11-11-2020 at 11:53 AM. Reason: Added link
Reply With Quote
Reply

Bookmarks

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 11:47 PM.
vBulletin, Copyright 2020, 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.