torque converter woes - Bimmerfest - BMW Forums

Welcome to Bimmerfest -- The #1 Online Community for BMW related information! Please enjoy the discussion forums below and share your experiences with the 200,000 current, new and past BMW owners. The forums are broken out by car model and into other special interest sections such as BMW European Delivery and a special forum to voice your questions to the many BMW dealers on the site to assist our members!

Please follow the links below to help get you started!

Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 3 Series & 4 Series > E36 (1991 - 1999)

E36 (1991 - 1999)
The E36 chassis 3-Series BMW was a huge hit among driving enthusiasts from the first moment the car hit the pavement. The E36 won numerous awards over the years it was produced and is still a favorite of many BMW enthusiasts to this day! -- View the E36 Wiki

Thread Tools Display Modes
Old 02-17-2009, 12:28 PM
brycea brycea is offline
Registered User
Location: Minneapolis
Join Date: Feb 2009
Posts: 6
Mein Auto: 1995 325i convertible
torque converter woes

Hello! I have a 95 BMW 325i convertible with an auto tranny (GM made A4S 310R model I believe). 89,000 miles. I'm having a problem where the transmission doesn't "like" having the torque converter locked up. When I'm cruising on the highway in 4th gear (say, at 60 mph), the torque converter will normally NOT lockup, so the engine runs around 3,000 RPM. However, if I press on the gas a bit to accelerate, the torque converter locks up! Makes no sense... If I then push the throttle around halfway down, the torque converter unlocks (makes sense), and if I push further it drops to 3rd gear (also makes sense). The problem is that I would think the torque converter should be locking up when I'm cruising at highway speeds, and should unlock only when my foot comes completely off the gas or I'm asking for significant acceleration.

I spoke with a local transmission shop, and they suggested that the throttle position sensor may have a "flat spot" in the resistance measurement it sends to the computer, so the computer thinks I'm barely touching the gas and doesn't lock up the torque converter. Since this isn't a throttle-by-wire car, I thought this made a lot of sense, so I tried a new TPS sensor. No change.

I purchased this car in 2005 (66,000 mi) and changed the trans. fluid and filter back then with Redline D4 ATF. I changed it again last month to see if the torque converter behavior would change, but no luck. Has anyone noticed this with their car? Any ideas/suggestions? Thanks in advance!

'95 325ic
Reply With Quote

See More Related BMW Stories

e36, lockup, torque converter, transmission

Forum Navigation
Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 3 Series & 4 Series > E36 (1991 - 1999)
Today's Posts Search
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 On

Forum Jump

All times are GMT -7. The time now is 08:19 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
© 2001-2015 performanceIX, Inc. All Rights Reserved .: guidelines .:. privacy .:. terms