4l80e help (trans or torque converter slip)
10-02-2018, 03:39 PM
#1
12 Second Club
Thread Starter
iTrader: (2)
Join Date: Feb 2004
Location: Front Royal, VA
Posts: 1,011
Likes: 0
Received 0 Likes
on
0 Posts
4l80e help (trans or torque converter slip) 5.3 small cam
freshly rebuilt 4l80e with circle D 3000 stall
82 s10
Shifts seem slow. I'm not sure that it's actually shifting to 4th, i manually pull back to 3rd and the rpms stay the same.
I'm also trying to understand the relationship between input output shaft speed and RPM, i also noticing TCC slip at times. Also tcc mode: apply en, apply. I was only expecting to see lock and off.
I've air checked 4th gear, looked over the valve body, everything moves, nothing is binding.
IS the trans slipping, converter slipping
Here is a video of the log:
I've also attached the full scan and channel config.
I hope someone can provide some insight as to what is really going on.
thanks
freshly rebuilt 4l80e with circle D 3000 stall
82 s10
Shifts seem slow. I'm not sure that it's actually shifting to 4th, i manually pull back to 3rd and the rpms stay the same.
I'm also trying to understand the relationship between input output shaft speed and RPM, i also noticing TCC slip at times. Also tcc mode: apply en, apply. I was only expecting to see lock and off.
I've air checked 4th gear, looked over the valve body, everything moves, nothing is binding.
IS the trans slipping, converter slipping
Here is a video of the log:
I've also attached the full scan and channel config.
I hope someone can provide some insight as to what is really going on.
thanks
10-04-2018, 08:07 AM
#4
Teching In
Join Date: Mar 2015
Location: Houston, Tx
Posts: 45
Likes: 0
Received 0 Likes
on
0 Posts
Do you have any codes for the trans? I JUST got done with my 4l80e swap tuning in my truck. That took me a long time, for sure. I chased my tail for a long time until I figured out that the 4l80es work differently than the 60s. the tcc works with PWM so its possible for it to be locked, but not quite locked I guess?
I'm not on my tuning laptop right now but I'll look when I get home. until then I can say that you shouldn't modify anything in the trans stuff except for shift speed/rpm and tcc lock speed. I also changed the tps% unlock. That's it. Don't mess with pressures or tcc duty cycle min/max. I always did 98/99 on the 60s but the 80s tables have to be all wonky.
I'm not on my tuning laptop right now but I'll look when I get home. until then I can say that you shouldn't modify anything in the trans stuff except for shift speed/rpm and tcc lock speed. I also changed the tps% unlock. That's it. Don't mess with pressures or tcc duty cycle min/max. I always did 98/99 on the 60s but the 80s tables have to be all wonky.
10-04-2018, 10:14 AM
#5
12 Second Club
Thread Starter
iTrader: (2)
Join Date: Feb 2004
Location: Front Royal, VA
Posts: 1,011
Likes: 0
Received 0 Likes
on
0 Posts
Do you have any codes for the trans? I JUST got done with my 4l80e swap tuning in my truck. That took me a long time, for sure. I chased my tail for a long time until I figured out that the 4l80es work differently than the 60s. the tcc works with PWM so its possible for it to be locked, but not quite locked I guess?
I'm not on my tuning laptop right now but I'll look when I get home. until then I can say that you shouldn't modify anything in the trans stuff except for shift speed/rpm and tcc lock speed. I also changed the tps% unlock. That's it. Don't mess with pressures or tcc duty cycle min/max. I always did 98/99 on the 60s but the 80s tables have to be all wonky.
I'm not on my tuning laptop right now but I'll look when I get home. until then I can say that you shouldn't modify anything in the trans stuff except for shift speed/rpm and tcc lock speed. I also changed the tps% unlock. That's it. Don't mess with pressures or tcc duty cycle min/max. I always did 98/99 on the 60s but the 80s tables have to be all wonky.
if you could post your tune so I can look at your trans settings that would be awesome.
ive been looking at different tunes I have found and compared settings trying to figure out if that could be the problem
10-04-2018, 11:09 AM
#6
Teching In
Join Date: Mar 2015
Location: Houston, Tx
Posts: 45
Likes: 0
Received 0 Likes
on
0 Posts
yeah I’m on my way home now. When I get here I’ll upload my tune. I did start from scratch though, as in I started with the 2002 Tahoe flex tune and segment swapped the avalanche 2500 4l80 segment in, THEN did the os upgrade to 2 bar, THEN went in and changed all my shift speeds rpms and tcc unlocks speeds and what not. I think segment swapping an already upgraded OS screwed with mine some. Like, when I did my 60->80 swap I already had 2 bar flex working, so I just segment swapped it. For some reason the segment swap was adjusting my map offset. Wtf? So I started over. Haven’t had any issues after that.
If you do do decide to use mine then make sure you segment swap the trans AND trans diagnostic tables. Also, I’m on a p01. Everything is out of a 2002. 2002 Tahoe flex os, 2002 avalanche 4l80 segment, 2002 gmc computer (but I don’t think that matters.) originally I was trying to use a 2003 4l80 segment and wondered if that messed something up in the segment swap. I think maybe using a p59 4l80 segment in a p01 messes with it, but I don’t have proof. Just my anecdotal experience.
10-04-2018, 12:57 PM
#7
Teching In
Join Date: Mar 2015
Location: Houston, Tx
Posts: 45
Likes: 0
Received 0 Likes
on
0 Posts
here's my tune. I looked at your log and honestly, it looks pretty much normal... next time you get a chance, get up under your car/truck and use the scanner controls to actuate the solenoids. just go into "transmission" and select first gear, second gear, third gear, 4th gear. you'll hear a click for 1,3, and 4. if you don't hear a click for 4 maybe you have a bad solenoid.
also, you don't mention the computer model. p01 or p59 or whatever. if youre using a p01 then feel free to just segment swap my trans segment and trans diag segment and see if it feels better. I'm very satisfied with my tune.
also, you don't mention the computer model. p01 or p59 or whatever. if youre using a p01 then feel free to just segment swap my trans segment and trans diag segment and see if it feels better. I'm very satisfied with my tune.
Trending Topics
10-09-2018, 07:58 PM
#11
It is so rare to have solenoids fix anything.. The computer blames the solenoids when there are mechanical problems. The PCM blames the solenoids when there is water inside the unit. The PCM blames the solenoids anytime it commands a shift, and for ANY reason that shift does not happen. Glad to hear you got it solved.