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Cold Transmission Hot transmission

Discussion in '95-older Toyota Truck Tech' started by tntoyota, Mar 5, 2007.

  1. tntoyota

    tntoyota

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    I have a big problem. I have an automatic transmission.

    It came factory so I woulden't mind if it stays.

    I H8 AT's by the way and in the future I will consider a swap allong with other modifications.

    stock for now and possably forever, DD (I heart) kinda thing.

    94 Toyota 4Runner, 3.0L, V6, 4x4, AT, 4:57's.

    I do drive it like a stick and in ECT all the time.

    The diagnoses:

    Ok, when the trans is cold, sitting over night or long enough to get very cold.

    1: the trans squats or "torqe's" while enguaging the gear selector.
    squats hard down for reverse
    squats hard up for drive


    2: has trouble (stalling or locking?) in drive and will not change to 2nd.
    Take off, (slightly warm) it revs and feel's like it's floating, as though it's in low4 then you can feel it break loose in the trans, to 1st, and then it shift's into 2nd, shifts sluggish but go's ok from there.

    Fully cold it will not shift into 2nd.

    3: when warm you can shift D-N-R and visea versa and fell the trans break loose. (stop's squating)


    4: when hot, fully op. tempreture no problems sluggish shifts(warm) when broke loose, *while op. temp comes up to full.*
    Once at full op. temp NO shift/stall/slip problems.

    Transmission does NOT slip or hesitate when hot.


    History:

    at @ 150-160K I changed fluid to MOBLE-1 syn.

    just prior (day's) I had run through some water, (no skid plate) barely enough to tempareraly foul the spark plugs.


    just after the water, changed the original fluid, then again after and thought I saw water, come to think of it, becouse I noticed little beads running down the catch can to the drain, but only after most (99%) of the fluid drained, I thought this was just the drippings. :confused:


    changed once more and have had this problem since I first changed the fluid.

    I believe in quality materials and there benifits.

    I believe you gotta pay to play.

    I wish to have high quality materials in my high quality Toyota's

    Do you think it's the fluid?

    It wasen't like a river crossing I just plowed through some water.

    I did fill low, then warm to allow the temp of fluid increase.
     
    Last edited: Mar 5, 2007
  2. extremetoy1

    extremetoy1

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    I believe it all has to to with the temperature switch that doesnt allow the tranny to shift when cold to second gear to warm the engine up. (your switch is fine, and doing what it is supposed to)


    I bet alot of people wonder why their tranny doesnt shift right away and blame it on being cold..... well that is why (cold) but not because the tranny fluid is cold- because the engine is cold, and by over reving the engine gets warm faster (yeah bad idea) so allow it to warm up to operating temp before getting on the highway *IT DOESNT TAKE THAT LONG TO WARM UP, AND IT WILL SAVE AVER REVING YOUR POOR 3.0)
     
  3. tntoyota

    tntoyota

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    Before all this,

    I could, cold and go. (BUT....I don't) RARELY!


    NO PROBLEMS............NONE

    Trust me it torqe's.

    It does need rear breaks but what were talkin is violent, hard, weird, abnormal.

    And it quits when hot and warm.
     
    Last edited: Mar 5, 2007
  4. tntoyota

    tntoyota

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    It will over rev becouse it wont shift period, past red line 6,000+ rpm.
    It will not shift.
     
    Last edited: Mar 5, 2007
  5. extremetoy1

    extremetoy1

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    yes it will over rev bacause it doesnt shift.... let it warm up, then it will- if your temp gauge isnt up to the normal operating range it WILL not shift...

    it didnt do this before because it was probably summer and it warms up much quicker when the engine is already 80 degrees.
     
  6. tntoyota

    tntoyota

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    I was editing this when you where repying
     
    Last edited: Mar 5, 2007
  7. tntoyota

    tntoyota

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    Transmissions are'nt made not to shift when there cold. (EXC.Toy AT OD's)


    I've NEVER seen one.............NEVER


    Explain the "break","shift","floating", "sliping", like it's got two first gears.

    It's like the clutch is'nt locking.


    My previous winter's did not include this.

    Just when I F'ed with it.


    Strainer?

    Is there a pressure regulater?
     
  8. extremetoy1

    extremetoy1

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    the transmission is electroniclly controled as are most toy autos and yes it will not shift until the engine is warm PERIOD no matter what u do
     
  9. tntoyota

    tntoyota

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    Weird thing,

    Go down the road, warm, will not shift, gas it, it slips then locks, goes on. *Has to be warm enough* to break

    Sumetimes, warn, will not shift, go down the road 5-6k rpm, back sudenly off, it lurches fwd and you can feel the trans "break loose" goes on.


    Arent there clutches in an AT?

    Are they stuck?
     
  10. 2ndGenToyotaFan

    2ndGenToyotaFan Ice-Bound Moderator

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    It's complicated....
    Pull the tranny trouble codes. You have to ground the "DG" connection while the key and O/D are both on and it will flash out the codes on the O/D light. The DG connector looks like it comes out of the wiring harness near the AMF in the engine bay, and it's a square looking plug end.... If you get any codes I'll let you know what they mean.
     
  11. tntoyota

    tntoyota

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    OK thank's

    I thought the light had to be on to do that.
     
  12. 2ndGenToyotaFan

    2ndGenToyotaFan Ice-Bound Moderator

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    It's complicated....
    The overdrive light does have to be on.
     
  13. tntoyota

    tntoyota

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    Yes it is electronicly/temparature controled.........for the OD only!


    I have been in other Toy v6 at's 4x's, cold and go, fine just no OD until they get to op temp.

    1-2-3 fine, but no 4

    And thats stupid for people to do as cold air is going through the radiator and engine bay making it harder to warm up.
     
    Last edited: Mar 5, 2007
  14. tntoyota

    tntoyota

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    *UPDATE*


    Last night I jumped in it, warmed it up, but not all the way, started out slow becouse I live very close to the hwy.

    Started going, slow, warm, but not all the way, went to break it loose it lunged fwd but did not break.

    So I thought I'll put it in 2 then back and fourth to see if I can shake it loose.

    Pulled it down in 2, it downshifted into 1

    DID NOT PUT SELECTOR IN 1

    SELECTOR WAS IN 2

    :confused: :confused: :confused: :confused: :confused: :confused: :confused:


    Could the plate's be sticking?
     
  15. 2ndGenToyotaFan

    2ndGenToyotaFan Ice-Bound Moderator

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    It's complicated....
    Linkage might be out of whack?
     
  16. tntoyota

    tntoyota

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    No, I dont think that would be be tempareture related.


    I think it's the clutches in the Torque converter


    IF I didn't hate the throws in a V6 5sp trans so much it would be in it now.
     
    Last edited: Mar 7, 2007
  17. cruiser88

    cruiser88

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    when is the last time you changed the fluid and filter:confused: you may have typed that i dont remember.but if not it almost sounds like when cold the fluid is naturally thick and because the filter maybe a little gumped up.then when warm the fluid thins up then of course the filter will allow for it to pass normally.but i could be way off
     
  18. tntoyota

    tntoyota

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    When was the last time it was above 50 ? (degree's) :lol:
     
    Last edited: Mar 7, 2007
  19. cruiser88

    cruiser88

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    3 years ago:flipoff2: oh ok;)
     
  20. tntoyota

    tntoyota

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    Ok, I guess the fluid (syn. high quality) is ok to use?


    or would you go back to non syn?