TC Won't Stay Locked With EFILive Tune

[duramaxdiesel]

I'm just curious if any of you guys have had a issue like this or know someone who has? On the stock tune my truck shifts and drives perfectly. When I install a tune it pulls very well and I'm happy with that. What I don't like is that when I drive and the TC is locked the second I lift my foot off the throttle the TC unlocks. It will lock up again if I get into it. I could be going 70, 80 or whatever speed and it still unlocks when I lift my foot. Really annoying when I'm towing. I tried Tow/Haul and it works intermittently at best. Even using Manual Mode I get the same results.

The truck is a 2008 LMM. All stock other than a CTS for gauges and a DPF delete tune with some more HP for towing and all around fun.

If any of you guys could shed some light on this I'd really appreciate it:thumb:

Thanks,


Nick

 

[plowboy_lbz]

Who tuned it? You may have to contact them.

 

[JoshH]

You need to check all the TCC apply and release tables and also the TCC max and min duty cycle tables.

 

[duramaxdiesel]

Thanks Josh. I'll have my tuner check that out and see what he says:thumb:

Tomorrow I have another big load to tow and having this happen all the time is a PITA.


Nick

 

[duramaxdiesel]

Josh, if the tables you mentioned we're never modified would that still cause a problem? Should they me modified?

Nick

 

[paint94979]

Who tuned your truck? My apply and release tables are quite modified... That's what it took to get my converter to lock before 4th gear

 

[SSchmi5519]

Who tuned your truck? My apply and release tables are quite modified... That's what it took to get my converter to lock before 4th gear

I did. He's reading lockup on an Edge CTS, and I wasn't quite sure if that was the problem. It happens on his DSP5 and on a single tune, both of which were created with his original stock tune. I have a few more ideas on how to go around this, just need a little time :thumb:

Its just very strange to me that this is happening. Cant say ive even ever heard of it :shrug:

 

[duramaxdiesel]

Steve from SS Diesel is doing the tuning for my LMM.

That's interesting to know. I'll pass that info along to Steve. Thanks for the help:thumb:


Nick

 

[duramaxdiesel]

Ha! Beat me to it!

 

[C.bowles2]

I wish I could help but I have a quick related question (sorry not trying to hijack the thread) when should the TC lock up, on my lly it only locks in 5th gear & at higher speeds and I can feel it lock in and lower the rpms. I'm reading it with a cts.


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[Dozerboy]

I wish I could help but I have a quick related question (sorry not trying to hijack the thread) when should the TC lock up, on my lly it only locks in 5th gear & at higher speeds and I can feel it lock in and lower the rpms. I'm reading it with a cts.

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If your not in TH that sounds right

 

[jkholder09]

Is the tcm an al40 or the newer one an al50 on the op's lmm?

 

[JoshH]

2008 trucks used the A40, so unless someone changed it (which wouldn't make much sense), that's what it has.

 

[Harbin_22]

2008 trucks used the A40, so unless someone changed it (which wouldn't make much sense), that's what it has.

Haha, I know of at least one truck that is lol. I swapped mine with a local farmer and he no longer owns the truck. If somebody ever tries to mess with it, they will be all screwed up

 

[meshanic]

Haha, I know of at least one truck that is lol. I swapped mine with a local farmer and he no longer owns the truck. If somebody ever tries to mess with it, they will be all screwed up

Ha Ha I had an 09 LMM with big twins I was tuning so I swapped the tcm with a farmer's 08 tcm. Now there's 2

 

[JoshH]

Ok, as long as the truck wasn't owned by some farmer... :roflmao:

 

[jkholder09]

2008 trucks used the A40, so unless someone changed it (which wouldn't make much sense), that's what it has.

Well I was kinda thinking it was a measured torque issue (I am not sure what the technical term is, but I am referring to the al50 and how it determines engine torque based on trans slippage) maybe but the al40's really don't do that feature in the strategy from what I understand.

Do you think that could effect drivabilty?

 

[JoshH]

Well I was kinda thinking it was a measured torque issue (I am not sure what the technical term is, but I am referring to the al50 and how it determines engine torque based on trans slippage) maybe but the al40's really don't do that feature in the strategy from what I understand.

Do you think that could effect drivabilty?

I've never heard of the TCM doing that, but I've never played with the A50 TCM any.

 

[jkholder09]

Ben tyler was talking about it somwhere.
I just can't remember where.
I have no idea if it would create a problem like this.
It was jjust stuck in the back of my head and I thought I would ask.
Thanks josh:thumb: