Results 1 to 14 of 14

Transmission staying out of overdrive

This is a discussion on Transmission staying out of overdrive within the Automatic Transmission forums, part of the Drivetrain category; Recently my camaro has been doing this in the mornings. i will go for a normal drive of about 15+ ...

  1. #1
    Senior Member SteveCZ28's Avatar
    Join Date
    Jul 2006
    Location
    Greene, Iowa
    Age
    32
    Posts
    1,707

    Red
    99 Chevrolet Camaro Z-28

    Transmission staying out of overdrive

    Recently my camaro has been doing this in the mornings. i will go for a normal drive of about 15+ miles a day or what not. but when i first get going get the car up to about 55-60mph, i can feel the car isnt in its 2nd stage of overdrive until the temp gauge comes up about quarter of the way then itll go into the 2nd part of overdrive. i checked my fluid and it is still good and red, and doesnt smell burnt. the transmission doesnt act up other than this. no slipping, or missing gears or anything or even weird noises. just slow to go into overdrive. and only in the mornings when its cool outside. any ideas guys??

  2. #2
    That guy thearborbarber's Avatar
    Join Date
    Nov 2007
    Location
    SoDak
    Posts
    892

    White over Red
    1991 Suburban

    The pcm is programmed to not lock the torque converter until the tranny reaches a predetermined temp. So your transmission is acting normal.

  3. #3
    Senior Member SteveCZ28's Avatar
    Join Date
    Jul 2006
    Location
    Greene, Iowa
    Age
    32
    Posts
    1,707

    Red
    99 Chevrolet Camaro Z-28

    well its only just started doing this.....

  4. #4
    Senior Member JaycenK's Avatar
    Join Date
    Nov 2008
    Location
    Holiday,FL
    Age
    40
    Posts
    1,378

    Green
    1997 Camaro Z-28

    Did you add a trans cooler? Change to a synthetic trans fluid?

  5. #5
    Senior Member SteveCZ28's Avatar
    Join Date
    Jul 2006
    Location
    Greene, Iowa
    Age
    32
    Posts
    1,707

    Red
    99 Chevrolet Camaro Z-28

    i made no changes to the car at all, and it only just started doing this last week. granted the outside temp is a bit cooler in the mornings now than it has been

  6. #6
    Member fieropope's Avatar
    Join Date
    Jan 2009
    Location
    union mo
    Posts
    183

    white
    01 formula

    completely normal you may have just now noticed it or it has been warm enough not to do this but the gm programmers do this so the engine gets warm as fast as possible lowering emissions compared to a cold engine. no problem here as long as it still locks up when you drive it to operating temp.

  7. #7
    Senior Member SteveCZ28's Avatar
    Join Date
    Jul 2006
    Location
    Greene, Iowa
    Age
    32
    Posts
    1,707

    Red
    99 Chevrolet Camaro Z-28

    well i added an e cutout about 2 months ago. so i notice alot more than i did before. so i guess its just because its getting cooler outside, and i notice it alot more/easier due to the car staying louder for a lil bit longer now. thanks for the input guys...i dont have to worry about it now

  8. #8
    VERITAS / AEQUITAS T/A Addicted's Avatar
    Join Date
    Jul 2009
    Location
    Ohio (Union county)
    Age
    41
    Posts
    92

    Pewter
    2002 T/A WS-6

    Quote Originally Posted by thearborbarber View Post
    The pcm is programmed to not lock the torque converter until the tranny reaches a predetermined temp. So your transmission is acting normal.
    I was unaware of this. Recently I added a trans-go shift kit into my A4 and have a perma cool trans cooler sitting in the garage I was planning to put in soon. (Ive read alot of places "a cool tranny is a happy long life tranny") My cars just a bolt on summer DD but I thought hell it cant hurt so I ordered it.

    Now I read your reply and am wondering if I'd be making a mistake. What temp does the tranny have to reach before the PCM allows lock up? and could the permacool 2 pass keep it too cool and never allow it to kick in? Thanks in advance.

  9. #9
    Member fieropope's Avatar
    Join Date
    Jan 2009
    Location
    union mo
    Posts
    183

    white
    01 formula

    i believe the pcm determines when to lock up based on engine temp not trans temp.because the engine runs more efficiently when warm, so for emmissions the quicker that engine warms up the less emissions put out.

  10. #10
    Senior Member JaycenK's Avatar
    Join Date
    Nov 2008
    Location
    Holiday,FL
    Age
    40
    Posts
    1,378

    Green
    1997 Camaro Z-28

    I have a reworked valve body in my 97 but mine locks up when it is still cold. Was this started after the lt1 cars in the ls1 program?

  11. #11
    Moderator Cutlass's Avatar
    Join Date
    Apr 2008
    Location
    Madison, WI
    Posts
    6,997

    1999 Formula WS6 M6-sold
    2001 Silverado Z71

    My '95 S-10 Blazer did that so its been out there for a while.

  12. #12
    Member fieropope's Avatar
    Join Date
    Jan 2009
    Location
    union mo
    Posts
    183

    white
    01 formula

    im unsure when they started this type of programming but i believe it is on obd2 and up for sure.

  13. #13
    Senior Member JaycenK's Avatar
    Join Date
    Nov 2008
    Location
    Holiday,FL
    Age
    40
    Posts
    1,378

    Green
    1997 Camaro Z-28

    Anyone know what temp range it has to be in? I live in Florida so I may never get cool enought to have that happen. Could mine not be doing that because of the reworked valve body?

  14. #14
    Member fieropope's Avatar
    Join Date
    Jan 2009
    Location
    union mo
    Posts
    183

    white
    01 formula

    well i believe that the op temp is what it looks for so less than 210 is supposed to make it delay the lock up sol. but if you modified the valve body to bypass the electrical sol. it might do it.

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. 700R4 Overdrive Transmission Rebuild - Overachievi
    By Ed Blown Vert in forum Firebird / WS6
    Replies: 1
    Last Post: 09-21-2017, 02:33 PM
  2. Step By Step: 4L60E Overdrive Transmission Swap
    By Ed Blown Vert in forum General Help
    Replies: 0
    Last Post: 08-12-2014, 03:10 AM
  3. Gearstar 200-4R Overdrive Transmission - Full Range
    By Ed Blown Vert in forum Camaro / SS
    Replies: 0
    Last Post: 05-26-2011, 09:00 AM
  4. Corvette Transmission Swap - Overdrive Upgrade
    By Ed Blown Vert in forum Corvette
    Replies: 0
    Last Post: 01-26-2010, 11:10 AM
  5. 700 R4 Transmission - Overdrive Evolution
    By Ed Blown Vert in forum Almost Anything Goes
    Replies: 1
    Last Post: 12-12-2007, 09:00 PM

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
  •