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Auto trans has a hard time shifting to 3rd when COLD

Discussion in '1st Gen. Tacomas' started by DNG, Apr 6, 2012.

  1. Apr 6, 2012 at 6:23 PM
    #1
    DNG

    DNG [OP] Well-Known Member

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    When starting my engine cold (morning cold), my truck has a hard time shifting to 3rd. I'll run at 2000+ rpm in 2nd but won't shift to 3rd unless the engine has warmed up a bit. This problem just came up a couple months ago. Any ideas?
     
  2. Apr 6, 2012 at 6:24 PM
    #2
    whippersnapper02

    whippersnapper02 Well-Known Member

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    Sounds like normal operation. That is what is called accelerated warm up.
     
  3. Apr 6, 2012 at 6:29 PM
    #3
    DNG

    DNG [OP] Well-Known Member

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    I used to be able to drive just fine even when cold. Never had to push such a high rpm
     
  4. Apr 6, 2012 at 6:33 PM
    #4
    whippersnapper02

    whippersnapper02 Well-Known Member

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    Check the fluid level then. Have you ever had the tranny flushed?
     
  5. Apr 6, 2012 at 6:34 PM
    #5
    ffirg

    ffirg Well-Known Member

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    Mine does the same. I believe it does this to warm up the truck properly before hitting high speeds.
     
  6. Apr 6, 2012 at 6:38 PM
    #6
    Adam Baum

    Adam Baum Well-Known Member

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    Mine does that from 1st to 2nd, and then 2nd to 3rd. After 10 minutes or easy driving it warms up and is fine.
     
  7. Apr 6, 2012 at 7:57 PM
    #7
    isu2014

    isu2014 RAT Products

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    View the build. Too much to list.
    Flush the fluid. The transmission is designed to do this to allow the engine to warm up, but as the fluid gets dirty the system doesn't work as efficiently.
     
  8. Apr 6, 2012 at 8:25 PM
    #8
    Miata Tech

    Miata Tech Well-Known Member

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    The purpose of holding it in a lower gear when cold is to get the Catalytic Converter to operating temperature as quickly as possible. Cold start and warm-up are high emission periods and Toyota needs to get the cats "lit" ASAP. The owners manual mentions the delayed shift to 3rd when cold.
     
  9. Apr 6, 2012 at 9:50 PM
    #9
    tacotopher

    tacotopher Well-Known Member

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    Mine with the 3.4 does the exact same thing.
     
  10. Apr 7, 2012 at 3:09 PM
    #10
    Phuket

    Phuket Well-Known Member

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    my 3.4 auto does the same as well. after how many miles should tranny get flushed?
     
  11. Apr 7, 2012 at 4:25 PM
    #11
    DNG

    DNG [OP] Well-Known Member

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    I haven't done a flush yet, and I don't know if the previous owner has (150k mi). I also haven't found a conclusive answer on whether flushing the trans fluid is safe or if it's better just to take the whole pan off.
     
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