F30POST
F30POST
2012-2015 BMW 3-Series and 4-Series Forum
BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read
BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > xDrive All-Wheel Drive Discussions > Possible transfer case issue?
Extreme Powerhouse
Post Reply
 
Thread Tools Search this Thread
      09-05-2020, 12:19 PM   #1
Stin999
New Member
2
Rep
22
Posts

Drives: F30 335i M Sport
Join Date: Feb 2019
Location: Stamford/CT/USA

iTrader: (0)

Hi everyone,

Recently I've been trying to diagnose an on going issue I've been having with my 2015 335i Xdrive. Any help would be much appreciated.

If i'm driving the car in manual mode (my car is an automatic), let's say cruising in 3rd gear, and I lift off the gas, I get an uncomfortable lurch forward sensation. The lower the RPM and gear, the worse the sensation. If I was in 1st gear and I let off the gas briefly, the car would very aggressively rock back and forth for a second before settling.

If I'm downshifting from 3rd gear to 2nd gear, I get an uncomfortable rock back and forth motion as well. Happens more so when downshifting at a lower RPMs. It kind of lurches forward and then rocks back and forth again for a brief second before settling and continuing on.

This also happens in automatic. If i'm coming a stop, it almost feels like the car doesn't want to downshift gears, and holds on to them until the very last second and then lurches me forward while quickly downshifting before coming to a complete stop.

My car has 48k miles. It's tuned BM3 Stage 1 (93 Octane). Supporting mods are MPPK intake, Fabspeed highflow catted downpipe, ER chargepipe, AWE performance mid-pipe and AWE cat-back exhaust.

Spark plugs changed within the last 4000 miles.

Transmission fluid changed in the last 1500 miles (Issue was going on before this but has progressively started to get worse).

Front and rear diff fluid changed in the last 1500 miles.

Car is running APEX EC-7's with a square setup 245/40/18 tires which were put on 1500 miles ago.
Appreciate 0
      09-12-2020, 11:22 PM   #2
435i_Phil
First Lieutenant
435i_Phil's Avatar
United_States
95
Rep
327
Posts

Drives: 2015 BMW 435i Xdrive Sportline
Join Date: Mar 2020
Location: Greater Philadelphia

iTrader: (0)

Garage List
2015 BMW 435XI  [0.00]
2009 Honda Civic  [0.00]
Quote:
Originally Posted by Stin999 View Post
Hi everyone,

Recently I've been trying to diagnose an on going issue I've been having with my 2015 335i Xdrive. Any help would be much appreciated.

If i'm driving the car in manual mode (my car is an automatic), let's say cruising in 3rd gear, and I lift off the gas, I get an uncomfortable lurch forward sensation. The lower the RPM and gear, the worse the sensation. If I was in 1st gear and I let off the gas briefly, the car would very aggressively rock back and forth for a second before settling.

If I'm downshifting from 3rd gear to 2nd gear, I get an uncomfortable rock back and forth motion as well. Happens more so when downshifting at a lower RPMs. It kind of lurches forward and then rocks back and forth again for a brief second before settling and continuing on.

This also happens in automatic. If i'm coming a stop, it almost feels like the car doesn't want to downshift gears, and holds on to them until the very last second and then lurches me forward while quickly downshifting before coming to a complete stop.

My car has 48k miles. It's tuned BM3 Stage 1 (93 Octane). Supporting mods are MPPK intake, Fabspeed highflow catted downpipe, ER chargepipe, AWE performance mid-pipe and AWE cat-back exhaust.

Spark plugs changed within the last 4000 miles.

Transmission fluid changed in the last 1500 miles (Issue was going on before this but has progressively started to get worse).

Front and rear diff fluid changed in the last 1500 miles.

Car is running APEX EC-7's with a square setup 245/40/18 tires which were put on 1500 miles ago.
This sounds more like transmission related issue than transfer case. Did you ever take it in to be looked at?
__________________
2015 435i Xdrive (The Machine)
Stanced 8th Gen Honda Civic (The daily) Instagram: f32_phil
Appreciate 0
      09-21-2020, 08:54 AM   #3
Nathen4242
Enlisted Member
Canada
14
Rep
36
Posts

Drives: 2015 F36 Gran Coupé 428iX N20
Join Date: Mar 2020
Location: Moncton, New Brunswick

iTrader: (0)

Quote:
Originally Posted by Stin999 View Post
Hi everyone,

Recently I've been trying to diagnose an on going issue I've been having with my 2015 335i Xdrive. Any help would be much appreciated.

If i'm driving the car in manual mode (my car is an automatic), let's say cruising in 3rd gear, and I lift off the gas, I get an uncomfortable lurch forward sensation. The lower the RPM and gear, the worse the sensation. If I was in 1st gear and I let off the gas briefly, the car would very aggressively rock back and forth for a second before settling.

If I'm downshifting from 3rd gear to 2nd gear, I get an uncomfortable rock back and forth motion as well. Happens more so when downshifting at a lower RPMs. It kind of lurches forward and then rocks back and forth again for a brief second before settling and continuing on.

This also happens in automatic. If i'm coming a stop, it almost feels like the car doesn't want to downshift gears, and holds on to them until the very last second and then lurches me forward while quickly downshifting before coming to a complete stop.

My car has 48k miles. It's tuned BM3 Stage 1 (93 Octane). Supporting mods are MPPK intake, Fabspeed highflow catted downpipe, ER chargepipe, AWE performance mid-pipe and AWE cat-back exhaust.

Spark plugs changed within the last 4000 miles.

Transmission fluid changed in the last 1500 miles (Issue was going on before this but has progressively started to get worse).

Front and rear diff fluid changed in the last 1500 miles.

Car is running APEX EC-7's with a square setup 245/40/18 tires which were put on 1500 miles ago.

Could possible be T-Case if i'm right the tires size from BMW/ For that car is 225/45R18 I know here we cant put anything not BMW (Approved tires sizes) it can mess with the t-case even if the tires work with a tire cal (from 1010tire. if you have warranty i would get it checked out but i'd put the approved tire size back on before getting it checked.
__________________
Nathen Wheten
BMW/MINI Moncton
Appreciate 0
Post Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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



All times are GMT -5. The time now is 05:41 AM.




f30post
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, vBulletin Solutions Inc.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST