Torque Converter lockup issues
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More Turbo
Joined: Nov 2011
Posts: 508
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From: PNW
Torque Converter lockup issues
So I had my batteries disconnected for about two hours the other night while I addressed some starter issues on my truck. I hooked everything back up and now when I am having shifting issues, it feels like the torque converter is locking up early and it hunts in and out under WOT. when I am slowing down it doesn't seem to unlock or downshift until I come to a stop, and lugs really bad when I get back on the throttle. what have I caused to happen here? 
thanks in advance for any pointers
truck stats: '97 F350 CC PSD 35" tires 4:10 gears 107k miles 15k on rebuilt trans.
thanks in advance for any pointers truck stats: '97 F350 CC PSD 35" tires 4:10 gears 107k miles 15k on rebuilt trans.
Fleet Owner
Joined: Jul 2006
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From: Mi'kma'ki
you should be very careful giving advice on a trans that cost as much as some of these trucks now.
if he follows your advice here for example,he's likely to loose his converter and, or, whole transmission in very short order.
the problem is likely electrical and needs to be addressed asap.
with 15k miles,she should be under warranty.take it back to the shop and have them diagnose the issue would be the best bet.
if he follows your advice here for example,he's likely to loose his converter and, or, whole transmission in very short order.
the problem is likely electrical and needs to be addressed asap.
with 15k miles,she should be under warranty.take it back to the shop and have them diagnose the issue would be the best bet.
Postmaster
Joined: Nov 2005
Posts: 3,168
Likes: 10
From: San Ramon Ca.
you should be very careful giving advice on a trans that cost as much as some of these trucks now.
if he follows your advice here for example,he's likely to loose his converter and, or, whole transmission in very short order.
the problem is likely electrical and needs to be addressed asap.
with 15k miles,she should be under warranty.take it back to the shop and have them diagnose the issue would be the best bet.
if he follows your advice here for example,he's likely to loose his converter and, or, whole transmission in very short order.
the problem is likely electrical and needs to be addressed asap.
with 15k miles,she should be under warranty.take it back to the shop and have them diagnose the issue would be the best bet.
Well I guess the sky could fall too. Why not advise the OP call a tow truck just in case every time he disconnects the battery.
The PCM is likely relearning. The only way to do that is to drive the truck. If the Op wasn't having any issues with the transmission before the batteries were disconnected I believe this to be the case.
Are there any other questions?
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More Turbo
Joined: Nov 2011
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From: PNW
Problem solved
Thanks Pete, that was the issue - my '03 cobra needed to "relearn" how I drove it after the battery was unhooked but this was a little more dramatic so I figured I better run it by some fellow motorheads before I went Evel Knievel on it. Thanks!
Fleet Owner
Joined: Jul 2006
Posts: 20,389
Likes: 849
From: Mi'kma'ki
Well I guess the sky could fall too. Why not advise the OP call a tow truck just in case every time he disconnects the battery.
The PCM is likely relearning. The only way to do that is to drive the truck. If the Op wasn't having any issues with the transmission before the batteries were disconnected I believe this to be the case.
Are there any other questions?
The PCM is likely relearning. The only way to do that is to drive the truck. If the Op wasn't having any issues with the transmission before the batteries were disconnected I believe this to be the case.
Are there any other questions?
i'll go back to reading in here where i belong.
well that's a relief.what a fear that would put in me on a fresh rebuilt trans.
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Fleet Owner
Joined: Aug 2004
Posts: 20,419
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From: AZ
I'm just repeating what racerx told me. I bought a valve body from them and my trans shifted really, really hard. I asked about this learning curve and they said our OBS's don't learn. They said the SD's did. My chip was screwing up my shifting with the new valve body and after I got that reburned everything was good. So.....maybe its just different PCM's in our OBS's, some learn, some don't? I'm confused. Or maybe I just misunderstood RacerX?
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Post Fiend
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From: Texas Coast
Frmr Ford Trans Engr
Joined: Aug 1999
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From: SE Florida
The PCM doesn't learn in the 7.3L. It does in the gas, and the 6.0L did, but the moron in charge of the software for the 7.3L didn't think the PCM could learn unless it was also firing spark plugs. They got rid of him after all the 7.3L software was done.
Post Fiend
Joined: Feb 2009
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From: Texas Coast
Okay
Mark how come people keep think that then? Is that because of chips and or sparking moding a chip or maybe its even heat related and the connections get better or even a circuit voltage improvement, springs get unhung-- dont know just guessing.
I keep seeing this mentioned yr after yr that the pcm can learn some, so thats why I ask, see it mentioned in other diesel sites too. Your thoughts on that are appreciated.
Maybe its teh gas ones that are throwing everyone off
Mark how come people keep think that then? Is that because of chips and or sparking moding a chip or maybe its even heat related and the connections get better or even a circuit voltage improvement, springs get unhung-- dont know just guessing.
I keep seeing this mentioned yr after yr that the pcm can learn some, so thats why I ask, see it mentioned in other diesel sites too. Your thoughts on that are appreciated.
Maybe its teh gas ones that are throwing everyone off
Post Fiend
Joined: Dec 2009
Posts: 15,505
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From: Livoina,La
Mark if it doesn't have to learn then why does my truck shift all over the place for the first coue of take off's then it goes back to normal shift points after the batteries have been disconnected for awhile