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Thread: TCC releasing at crusing speeds with light throttle

  1. #21
    Lifetime Member HellKnightHicks's Avatar
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    Funny thing about it is that it doesnt do it while things are warming up it only does it once its up to temp... 5~10 min of driving and it wont stay locked.

    shot a video audio is all messed up because apparently the exhaust resonates at exactly the correct frequency as the mic on my phone.... And youtube is being a tard about letting me get the link to my unlisted video.


    Im feathering the throttle there.

    I think i can feel it slipping before it comes out.

  2. #22
    Lifetime Member HellKnightHicks's Avatar
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    More data from the log

    From my newbish understanding the info below indicates that the TCC is indeed slipping even though its in locked status.

    LOG
    Final LOG of the night.efi

    Data Points
    Click image for larger version. 

Name:	Locked TCC slip then returning to normal.png 
Views:	113 
Size:	65.5 KB 
ID:	15983Click image for larger version. 

Name:	Slipage.png 
Views:	113 
Size:	55.3 KB 
ID:	15984

  3. #23
    Joe (Moderator) joecar's Avatar
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    When that happens, also look at the pids TCCDC, TIS, TOS.

    It's not as simple as believing the TCCSLIP pid... I found for some OS's it is accurate while for others it is not.

  4. #24
    Lifetime Member HellKnightHicks's Avatar
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    Event Begin
    Click image for larger version. 

Name:	TCC Event.png 
Views:	112 
Size:	51.9 KB 
ID:	15990

    Event End
    Click image for larger version. 

Name:	TCC Event End.png 
Views:	109 
Size:	48.3 KB 
ID:	15989

    Im no expert but it looks like its the TCC the input and output RPM stay the same threw the whole thing.

    What does that mean? Is something wrong with the tranny or is it just the TCC?

  5. #25
    Joe (Moderator) joecar's Avatar
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    I'm thinking it over...

  6. #26
    Lifetime Member darcy's Avatar
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    The difference between RPM and TIS should be converter slip.
    In 'Event Begin' you can see that RPM & converter slip rise together, while TIS & VSS don't really move - I'd attribute that to TCC clutch slip.

  7. #27
    Lifetime Member HellKnightHicks's Avatar
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    Quote Originally Posted by joecar View Post
    I'm thinking it over...
    Quote Originally Posted by darcy View Post
    The difference between RPM and TIS should be converter slip.
    In 'Event Begin' you can see that RPM & converter slip rise together, while TIS & VSS don't really move - I'd attribute that to TCC clutch slip.
    So what are we looking at a New TC because of the TCC (Torque Converter Clutch)?

    I upped the slip pressure increase per second but its not done anything.

    I just dont understand why it only does that when its hot. Is it not mantaining pressure? A new TC wouldnt fix that.

    Could the fluid be getting used somewhere else causing a low fluid scenario?
    Is this a side effect of lac of fluid?

    Possibly should I over fill the tranny and see if its a lac of fluid. (Heard that has negative effects)

    Im going to check the fluids after it does it the first time and see what ive got. My truck is lifted in the back though so i guess i should check the fluid on a hill to get a realistic reading lol.

    Thanks for the help. Any ideas would be appreciated at this point. I cant drive it to work or anywhere out of town and it acting like that.

  8. #28
    Joe (Moderator) joecar's Avatar
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    Does it only do it when hot...?

    I agree, overfill with 1 quart and try again, but every few miles check the dipstick for signs of aeration/bubbles.

    When you changed the filter, did you correctly install the new seal and the new filter...?

  9. #29
    Lifetime Member HellKnightHicks's Avatar
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    Only does it once it's hot

  10. #30
    Lifetime Member HellKnightHicks's Avatar
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    Quote Originally Posted by joecar View Post
    Does it only do it when hot...?

    I agree, overfill with 1 quart and try again, but every few miles check the dipstick for signs of aeration/bubbles.

    When you changed the filter, did you correctly install the new seal and the new filter...?
    Its a new tranny. Built by a tranny shop. So I dont know..

    I checked the fluid after running it was a little on the low side... But still on the stick... couple bubbles but no foam. added 1/2 a quart and then hit the road...

    Its getting to the point it wont hold TCC lockup at all at this point. Starts slipping out no more than it locks up.

    Fluid was a little yellowish but I wouldnt call it burnt.

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