DaveP
Active member
Re: 4l80e problem
This makes more sense than anything I came up with. Let us know what you find.
This makes more sense than anything I came up with. Let us know what you find.
4l80e problem
- Thread starter Houseofperformance
- Start date
Houseofperformance
switchhappy!!!
Re: 4l80e problem
thanks guys!
i just checked the shifter bracket - put it in park, unhooked the bracket from the cable, put the shifter to first, moved the bracket to first - and it matched perfectly again. hooked the cable up again , put the shifter to od, unhooked it, and the bracket was perfectly set in od.
i also didn´t get a bracket from george, as far as i remember - just the shortened shaft the bracked is mounted to.
i´ll perform the pressure test dave suggested later today and let you know!
did anyone get a chance to look at the log file i posted? any comments?
thanks guys!
i just checked the shifter bracket - put it in park, unhooked the bracket from the cable, put the shifter to first, moved the bracket to first - and it matched perfectly again. hooked the cable up again , put the shifter to od, unhooked it, and the bracket was perfectly set in od.
i also didn´t get a bracket from george, as far as i remember - just the shortened shaft the bracked is mounted to.
i´ll perform the pressure test dave suggested later today and let you know!
did anyone get a chance to look at the log file i posted? any comments?
bezerk
New member
Re: 4l80e problem
are you sure it starting in 1st gear. the way you are discribing the problem it seems like it starts in second gear, maybe even in third. i had this problem on quickstop his truck. if yu search, you can take a look on what i've done. i bassicly cut the wiring harnas so i could manual shift the solenoids a and b when holding to ground. i also found out that the way the tcs controller is setup th outputs on and and b are reversed, not sure if you got that problem, but atleast doing it this way you can check if the problem is at the trans or controller. i would really suggest you take this route because it's only a 5 min job to recheck it.
good luck!
are you sure it starting in 1st gear. the way you are discribing the problem it seems like it starts in second gear, maybe even in third. i had this problem on quickstop his truck. if yu search, you can take a look on what i've done. i bassicly cut the wiring harnas so i could manual shift the solenoids a and b when holding to ground. i also found out that the way the tcs controller is setup th outputs on and and b are reversed, not sure if you got that problem, but atleast doing it this way you can check if the problem is at the trans or controller. i would really suggest you take this route because it's only a 5 min job to recheck it.
good luck!
Houseofperformance
switchhappy!!!
Re: 4l80e problem
thanks rene!
i´ve seen the thread about quickstops trany - to check for the correct solenoid order:
i have to cut the wires i use to messure solenoid ressistance with at the tci plug - if i want first gear, i ground the wire of solenoid A - is that correct?
i checked the solenoids directly on the trany plug, and through the wiring harness for resistance, and set them under power and listened for the click - everything seemed ok!
did you take a look at the log file? is there anything obvious?
thanks rene!
i´ve seen the thread about quickstops trany - to check for the correct solenoid order:
i have to cut the wires i use to messure solenoid ressistance with at the tci plug - if i want first gear, i ground the wire of solenoid A - is that correct?
i checked the solenoids directly on the trany plug, and through the wiring harness for resistance, and set them under power and listened for the click - everything seemed ok!
did you take a look at the log file? is there anything obvious?
Houseofperformance
switchhappy!!!
Re: 4l80e problem
ok, i guess i can rule out an electrical cause - hooked up 2 voltmeters between wire E and solenoid A and B and went for a ride - the solenoids get power as they are supposed to: in first sol. A has power, in second no soleneoid sees power, in third B sees power, in fourth both see power. then i checked the order of the solenoid posts on the trany plug of the harness, and they are in the right order.
and i got my lockup back!!
tomorrow i will perform the pressure test, if that checks out ok i will start to remap the pressure valve duty cycle in first in slow increments to see if it reduces the slip.
i´ll keep you updated - thanks for the help!
ok, i guess i can rule out an electrical cause - hooked up 2 voltmeters between wire E and solenoid A and B and went for a ride - the solenoids get power as they are supposed to: in first sol. A has power, in second no soleneoid sees power, in third B sees power, in fourth both see power. then i checked the order of the solenoid posts on the trany plug of the harness, and they are in the right order.
and i got my lockup back!!
tomorrow i will perform the pressure test, if that checks out ok i will start to remap the pressure valve duty cycle in first in slow increments to see if it reduces the slip.
i´ll keep you updated - thanks for the help!
bezerk
New member
Re: 4l80e problem
i don't have the software to look at he logs sorry. dunno if you have bought a stage 3 shiftkit or something. but it sure sounds like the same problem i had with that truck, and there can't be much wrong inside the transmission execpt the valvebody, did you have to modify it?
as i remember quickstop bought a stage 3. thinking it was better than 2. but it meant manual shift kit, and if you connect the solenoids than you will have 2-3.
just cut the wires for solenoids a and b. use jackstands and see what it does.
i don't have the software to look at he logs sorry. dunno if you have bought a stage 3 shiftkit or something. but it sure sounds like the same problem i had with that truck, and there can't be much wrong inside the transmission execpt the valvebody, did you have to modify it?
as i remember quickstop bought a stage 3. thinking it was better than 2. but it meant manual shift kit, and if you connect the solenoids than you will have 2-3.
just cut the wires for solenoids a and b. use jackstands and see what it does.
![Quickstop [UK]](/community/data/avatars/m/5/5165.jpg?1570199786){kind=avatar}
Quickstop [UK]
Combating adversyty.
Re: 4l80e problem
ugh....
hope you figure it out - Rene is bang on with his wiring assessment. He knows too much about these trucks
ugh....
hope you figure it out - Rene is bang on with his wiring assessment. He knows too much about these trucks
Houseofperformance
switchhappy!!!
Re: 4l80e problem
the transmission was built by brian hartman couple years ago and is extremly modified - valve body, shift kit, billet internals.......I bought it second hand, but never run, of a board member who abonded his bowtie project - the engine and other parts went to adam (highperformancetrucks) and i got the trany.
i´ll cut the wires today and ground them manually to see if they are in the right order - you are most likely right: i´m starting out in third instead of first - but if the solenoid (wire) order is switched, wouldn´t the trany shift:
3-2-1-4 ?
my shift patterns feel more like: 3-2-3-4
i´ll let you know what the manualy grounding reveals.
thanks!
the transmission was built by brian hartman couple years ago and is extremly modified - valve body, shift kit, billet internals.......I bought it second hand, but never run, of a board member who abonded his bowtie project - the engine and other parts went to adam (highperformancetrucks) and i got the trany.
i´ll cut the wires today and ground them manually to see if they are in the right order - you are most likely right: i´m starting out in third instead of first - but if the solenoid (wire) order is switched, wouldn´t the trany shift:
3-2-1-4 ?
my shift patterns feel more like: 3-2-3-4
i´ll let you know what the manualy grounding reveals.
thanks!
bezerk
New member
Re: 4l80e problem
if you deside to take the pan off at one point to see if you perhaps got a manual vavebody you can see that if you stand behind the car and than the most right handed oil gallerie is blocked. you won't be able to push it in (next to the a and b solenoids)
and if you take the valvebody off you will see some galleries are bored open and you will see 12 checkbals instead of 13
if you deside to take the pan off at one point to see if you perhaps got a manual vavebody you can see that if you stand behind the car and than the most right handed oil gallerie is blocked. you won't be able to push it in (next to the a and b solenoids)
and if you take the valvebody off you will see some galleries are bored open and you will see 12 checkbals instead of 13
Houseofperformance
switchhappy!!!
Re: 4l80e problem
droping the pan is no problem, since i have removed and installed the whole trany three times now;-)
checkballs: if i remember correctly, i only had 8 or 9 checkballs in there - is the help thread form george blake deleted? i had posted pictures of the checkballs, shift kit and valvebody modifications there, just to verify everything is in check, before i reasemble and install the trans.
the shiftkit was definetly a hd 2.
i´m going for a testride with the manual grounded solenoid(s) now - i´ll let you know!
droping the pan is no problem, since i have removed and installed the whole trany three times now;-)
checkballs: if i remember correctly, i only had 8 or 9 checkballs in there - is the help thread form george blake deleted? i had posted pictures of the checkballs, shift kit and valvebody modifications there, just to verify everything is in check, before i reasemble and install the trans.
the shiftkit was definetly a hd 2.
i´m going for a testride with the manual grounded solenoid(s) now - i´ll let you know!
Houseofperformance
switchhappy!!!
Re: 4l80e problem
ok - manualy grounding the solenoids: i can definetly feel the difference between a grounded A and a grounded B solenoid, grounding B gives me 3rd and truck takes off even slower, but: when manualy grounding A and trying to boostlaunch or take off quickly = same problem as if the computer controls grounding, it´s almost like it´s jumping out of gear as soon as it sees a certain amount of tourque or tps - when accelerating slow it acts normal.
rene, if you want to take a look at the log file you can download the software for free, here is the link:
http://www.tciauto.com/Products/Electronics/t-com_wp.asp
ok - manualy grounding the solenoids: i can definetly feel the difference between a grounded A and a grounded B solenoid, grounding B gives me 3rd and truck takes off even slower, but: when manualy grounding A and trying to boostlaunch or take off quickly = same problem as if the computer controls grounding, it´s almost like it´s jumping out of gear as soon as it sees a certain amount of tourque or tps - when accelerating slow it acts normal.
rene, if you want to take a look at the log file you can download the software for free, here is the link:
http://www.tciauto.com/Products/Electronics/t-com_wp.asp
Houseofperformance
switchhappy!!!
Re: 4l80e problem
when grounding A I can hear the click - resistance is also within the parameters.
I'm shure that I'm leaving the line in first now, but I somehow loose it as soon as I give to much throttle - doesn't matter if A is grounded by hand or by the tci.
Another thing I noticed today: when in manual first (shifted),just before coming to a hold, something seems to engage and the truck stops by itself completely without using the brake.
Seems strange.
I,m typing on the phone now, sorry for the short answer
when grounding A I can hear the click - resistance is also within the parameters.
I'm shure that I'm leaving the line in first now, but I somehow loose it as soon as I give to much throttle - doesn't matter if A is grounded by hand or by the tci.
Another thing I noticed today: when in manual first (shifted),just before coming to a hold, something seems to engage and the truck stops by itself completely without using the brake.
Seems strange.
I,m typing on the phone now, sorry for the short answer
Houseofperformance
switchhappy!!!
Re: 4l80e problem
I will check that tomorrow and let you know.
Thanks
I will check that tomorrow and let you know.
Thanks
Houseofperformance
switchhappy!!!
Re: 4l80e problem
when on the lift, freewheeling it in od: doesnt seem to shift at all - seems like it´s riding in second gear at about 20mph.
when manualy grounding sol A speed drops to 15mph.
when grounding both sol. it rides at 20mph
when grounding B: nothing seems to change
when taking power of both solenoids: nothing seems to change.
i ordered both solenoids today - maybe one is gloged or can´t hold the pressure once it rises over a certain point.
seems like this guy had a simular problem with his 4l80e:
http://ls1tech.com/forums/automatic-transmission/906516-4l80e-gto-hdt2-transgo-car-locks-1st.html
just his will only act up in manual first and not in drive, mine has the problem in both.
when on the lift, freewheeling it in od: doesnt seem to shift at all - seems like it´s riding in second gear at about 20mph.
when manualy grounding sol A speed drops to 15mph.
when grounding both sol. it rides at 20mph
when grounding B: nothing seems to change
when taking power of both solenoids: nothing seems to change.
i ordered both solenoids today - maybe one is gloged or can´t hold the pressure once it rises over a certain point.
seems like this guy had a simular problem with his 4l80e:
http://ls1tech.com/forums/automatic-transmission/906516-4l80e-gto-hdt2-transgo-car-locks-1st.html
just his will only act up in manual first and not in drive, mine has the problem in both.
Quickstop [UK]
Combating adversyty.
Re: 4l80e problem
you've tried controllers right? The guys at PCS suggested to me that possibly a driver went and got fried so maybe that's worth considering. Useful to rule it out at least.
you've tried controllers right? The guys at PCS suggested to me that possibly a driver went and got fried so maybe that's worth considering. Useful to rule it out at least.
Houseofperformance
switchhappy!!!
Re: 4l80e problem
thanks quickstop!
i think the controller works - since the problem doesn´t change when manualy grounding the solenoids, and i also checked the voltage/ground to each solenoid while driving, and they get ground in the exact right order, and i can feel every shift when they do.
i´m running the oldstyle tci unit, only the new tci unit (red box) is actually a pcs unit i think.
I either have a valvebody/checkball problem or a solenoid/gasket acting up under certain pressure or tourque , i guess.
every other gear works perfect, trany is tight under lockup condition, and truck is scary fast everywhere except for first - but first is the most fun in this things:-(((
i´ll do a pressure test again this weekend in every gear to see if the trany bleeds off pressure somwhere - i realy hope it´s just a solenoid problem.
thanks quickstop!
i think the controller works - since the problem doesn´t change when manualy grounding the solenoids, and i also checked the voltage/ground to each solenoid while driving, and they get ground in the exact right order, and i can feel every shift when they do.
i´m running the oldstyle tci unit, only the new tci unit (red box) is actually a pcs unit i think.
I either have a valvebody/checkball problem or a solenoid/gasket acting up under certain pressure or tourque , i guess.
every other gear works perfect, trany is tight under lockup condition, and truck is scary fast everywhere except for first - but first is the most fun in this things:-(((
i´ll do a pressure test again this weekend in every gear to see if the trany bleeds off pressure somwhere - i realy hope it´s just a solenoid problem.
Houseofperformance
switchhappy!!!
Re: 4l80e problem
when the solenoid change doesn´t do anything the valve body is next on the list, even though i´d like to keep the reworked/improved valvebody with the shiftkit.
could a missplaced or missing checkball cause this condition? i don´t think it is sliping, it feels like it is engaging 2 gears simultaniously when pressure rises in first gear causing a bind.
when the solenoid change doesn´t do anything the valve body is next on the list, even though i´d like to keep the reworked/improved valvebody with the shiftkit.
could a missplaced or missing checkball cause this condition? i don´t think it is sliping, it feels like it is engaging 2 gears simultaniously when pressure rises in first gear causing a bind.