4l80e no wot kickdowns
Thread Starter
Joined: Dec 2009
Posts: 2,331
Likes: 29
From: Glennville, GA.
4l80e no wot kickdowns I built this 80e for a friend. Fti 3400 stall. Trans shifts great on upshifts. If u try and make a 30-40mph wot hit it stays in second. Try and make a 60mph hit It stays in second no 1st gear kickdown with ecu controlling it. I've been a tuner for 10yrs so I've played with all tables for speed etc no fix.
Hear is the thing. If i open hptuners scanner and command a 1st gear at around 30ish mph it will go to 1st and will shift to 2nd when commanded. Its got me puzzled never had one do this. Any suggestions?
Hear is the thing. If i open hptuners scanner and command a 1st gear at around 30ish mph it will go to 1st and will shift to 2nd when commanded. Its got me puzzled never had one do this. Any suggestions?
LS1Tech Sponsor
Joined: Mar 2023
Posts: 1,821
Likes: 1,159
From: BERWICK PA
Sound like a question for the tuning section. But what does logging data say is being commanded. but based on your force command if the PCM commands it then it should happen.
__________________
Frank formerly of Performabuilt, Now just me, What can I build for you today? Call or message me. Click sig pic for my facebook
Frank formerly of Performabuilt, Now just me, What can I build for you today? Call or message me. Click sig pic for my facebook
Thread Starter
Joined: Dec 2009
Posts: 2,331
Likes: 29
From: Glennville, GA.
It shifts great through all gears. Everything in scanner looks fine just no 1st as it should. Scanner shows 2nd like it's doing thin 3rd like it feels. At this point I think bricked ecu
LS1Tech Sponsor
Joined: Mar 2023
Posts: 1,821
Likes: 1,159
From: BERWICK PA
If the scanner is showing 2nd then that is what the PCM is commanding. The PCM has no method to determine what gear the trans is in, No feedback or pressure switch for that.
It does have a manifold pressure switch but that only shows the manual valve position not the actual commanded gear.
It does have a manifold pressure switch but that only shows the manual valve position not the actual commanded gear.
__________________
Frank formerly of Performabuilt, Now just me, What can I build for you today? Call or message me. Click sig pic for my facebook
Frank formerly of Performabuilt, Now just me, What can I build for you today? Call or message me. Click sig pic for my facebook
Thread Starter
Joined: Dec 2009
Posts: 2,331
Likes: 29
From: Glennville, GA.
I did the Reem the afl with a transgo valve. This thing has stumped me. I just tuned a 03 truck with a 60e yesterday. It was doing very similar things. Doesn't want to downshift at wot etc. I think I may have a issue with my hptuners or software. That's crazy 2 vehicles diff combos, diff trans etc doing similar things. Never seen this before.
I used to laugh at people that suggested bricked or bad ecu for stuff like this. ceramic film capacitors and silicon wafers should theoretically last 50+ years without issue. but i'm seeing this kinda thing more and more often on stock PCM's
I had my personal daily truck trans apart 3 times last summer chasing a lazy 2-1 at stoplights. AFL right? nope, after much horsing with it, I swapped in a different P01 and the problem was solved. Same OS, Vin, Serial etc...same TUNE FILE. just a PCM swap.
I know I'm crazy but I'm not *that *crazy.
I had my personal daily truck trans apart 3 times last summer chasing a lazy 2-1 at stoplights. AFL right? nope, after much horsing with it, I swapped in a different P01 and the problem was solved. Same OS, Vin, Serial etc...same TUNE FILE. just a PCM swap.
I know I'm crazy but I'm not *that *crazy.
Trending Topics
LS1Tech Sponsor
Joined: Mar 2023
Posts: 1,821
Likes: 1,159
From: BERWICK PA
I used to laugh at people that suggested bricked or bad ecu for stuff like this. ceramic film capacitors and silicon wafers should theoretically last 50+ years without issue. but i'm seeing this kinda thing more and more often on stock PCM's
I had my personal daily truck trans apart 3 times last summer chasing a lazy 2-1 at stoplights. AFL right? nope, after much horsing with it, I swapped in a different P01 and the problem was solved. Same OS, Vin, Serial etc...same TUNE FILE. just a PCM swap.
I know I'm crazy but I'm not *that *crazy.
I had my personal daily truck trans apart 3 times last summer chasing a lazy 2-1 at stoplights. AFL right? nope, after much horsing with it, I swapped in a different P01 and the problem was solved. Same OS, Vin, Serial etc...same TUNE FILE. just a PCM swap.
I know I'm crazy but I'm not *that *crazy.
__________________
Frank formerly of Performabuilt, Now just me, What can I build for you today? Call or message me. Click sig pic for my facebook
Frank formerly of Performabuilt, Now just me, What can I build for you today? Call or message me. Click sig pic for my facebook
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
