Results 1 to 7 of 7

Sometimes not in overdrive on the highway. How come?

This is a discussion on Sometimes not in overdrive on the highway. How come? within the General Help forums, part of the LSx Technical Help Section category; I bought this 2000 WS6 A4 about a month ago with 118,000 miles and it runs great. I took my ...

  1. #1
    Junior Member
    Join Date
    Oct 2014
    Location
    United States
    Posts
    44

    red
    2000 WS6

    Sometimes not in overdrive on the highway. How come?

    I bought this 2000 WS6 A4 about a month ago with 118,000 miles and it runs great. I took my car on a trip yesterday and it drove fine. I just did a fluid and filter change a few weeks ago and the car shifts great. Driving around, beating on it, whatever the case its always in the right gear with no slipping or anything. However, sometimes when I am on the highway sometimes the rpms will be a few hundred higher than normal. Then when I let off or coast down a hill it will "lock" into overdrive. It will stay in overdrive after this for most of the time. Then I will look back down and it will be in 4th again with the rpms a little higher. Shouldn't the car be in overdrive on the highway the whole time when just cruising? Or am I just being paranoid?

    Car is supposed to have a shift kit but I have no way of knowing. It shifts relatively firm I guess. I have never ridden in another car like mine to compare.

  2. #2
    Senior Member JayTA98's Avatar
    Join Date
    Dec 2007
    Location
    Orlando, FL
    Posts
    3,351

    Mean Black
    1998 Trans Am

    is the SES light on? Have you checked for codes?

  3. #3
    Senior Member Too Fast's Avatar
    Join Date
    Nov 2006
    Location
    Indianapolis
    Age
    54
    Posts
    5,170

    Black
    2000 WS6 6spd Hooker LT

    It's possible you have a torque converter lock-up problem. So what exactly happens? You're driving at normal operating temp on the highway, what does the RPM do? Your torque converter (TCC, torque converter clutch) should lock up in 3rd and 4th gear, over ~45 MPH. When just cruising, you can feel it and watch the tach drop a few hundred RPM when it does, which should be right away. When you give it some gas, the first thing the car will do to help you accelerate is unlock the TCC, then if that's not enough, downshift to 3rd or 2nd, depending on your right foot and current speed.

    When you let off the gas in gear, like coasting down a hill, the fuel injectors almost shut off, you may be feeling that, it's like a light application on the brakes.

  4. #4
    Junior Member
    Join Date
    Oct 2014
    Location
    United States
    Posts
    44

    red
    2000 WS6

    Well it hasnt done anything like I described since I posted this. It has been locked on the highway ever since. I think it might be just the thermostat not letting the car warm up like it should. I doubt its ever been replaced. The trans is shifting fine now and doing what it should on the highway. Even up a super steep hill it stays locked with no problems. Sorry guys didn't mean to cry wolf here.

  5. #5
    Veteran 0rion's Avatar
    Join Date
    Aug 2005
    Location
    ohio
    Posts
    22,520

    98 Formula
    06 duramax

    just in case.....what known mods are done to the car? There's a couple things that will keep that converter from locking up or cause it to unlock randomly. Is it the the stock stall converter?

  6. #6
    Junior Member
    Join Date
    Oct 2014
    Location
    United States
    Posts
    44

    red
    2000 WS6

    couldnt tell you what mods are done. long tube headers and the previous owner claimed a shift kit. but who knows

  7. #7
    Senior Member Too Fast's Avatar
    Join Date
    Nov 2006
    Location
    Indianapolis
    Age
    54
    Posts
    5,170

    Black
    2000 WS6 6spd Hooker LT

    Cool, sounds like you're good to go.
    Last edited by Too Fast; 11-06-2014 at 06:50 PM.

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Overdrive?
    By AfterYou in forum Automatic Transmission
    Replies: 4
    Last Post: 09-25-2010, 10:10 AM
  2. Question: overdrive pulleys
    By DARK PHX in forum V6
    Replies: 4
    Last Post: 07-14-2010, 12:26 PM
  3. No overdrive
    By cm1273 in forum Automatic Transmission
    Replies: 9
    Last Post: 03-23-2010, 05:40 PM
  4. Overdrive vs. no Overdrive
    By Johny Bee O in forum Drivetrain
    Replies: 2
    Last Post: 10-13-2008, 02:08 AM
  5. overdrive
    By luciangage in forum Automatic Transmission
    Replies: 13
    Last Post: 10-22-2006, 09:24 AM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •