Open/Closed loop transmission function
Thread Starter
|
Cross-Country
Joined: Jul 2020
Posts: 56
Likes: 8
Open/Closed loop transmission function
Hopefully one of you can point me the right direction. My freshly built 4r70w is having problems going into third and beyond while at the tuner. I have a kenne bell on the 5.0 in a 1994 F150 4x4. The transmission got a shift kit and the converter was brazed and tightened up a bit. I did drive the truck for a while without the supercharger, without issue. I have not ruled out the shift kit and converter as the mistake that led to my problems. I am wondering if anyone knows what/if the computer does things differently for open loop/closed loop operation when it comes to transmission function.
Also, what's a healthy O2 signal?
Thanks a bunch!
Also, what's a healthy O2 signal?
Thanks a bunch!
Last edited by Bignasty2; May 28, 2023 at 11:46 AM. Reason: truck year
Thread Starter
|
Cross-Country
Joined: Jul 2020
Posts: 56
Likes: 8
THANKS!!!
Cargo Master
Joined: Mar 2007
Posts: 2,848
Likes: 1,034
Metal in the fluid is not a good idea but you have to understand that you have a truck that is almost 30 years old. Just because someone touches it, does not mean they screwed it up. Yes, it can happen, but things break and sometimes they break when you are working on it or minutes after you have. Just because you do an oil service does not mean the flat tire is the mechanics fault.
That said, if I had that transmission out, I would have gone through it. It's 30 years old. There has got to be some wear items that need to be changed out.
That said, if I had that transmission out, I would have gone through it. It's 30 years old. There has got to be some wear items that need to be changed out.
Hotshot
Joined: Jun 2015
Posts: 12,871
Likes: 2,445
Here is part of post #1 with highlighted words for you reread….
Cargo Master
Joined: Mar 2007
Posts: 2,848
Likes: 1,034
My mistake. I read the post right above about the converter.
Metal, glitter, whatever words are used, there should not be any in the fluid. Not certain why you thought that I was recommending that.
A good rebuilder would want to check things out. I would remove it out and see what went wrong.
Metal, glitter, whatever words are used, there should not be any in the fluid. Not certain why you thought that I was recommending that.
A good rebuilder would want to check things out. I would remove it out and see what went wrong.
Hotshot
Joined: Jun 2015
Posts: 12,871
Likes: 2,445
Because you used the phase that you did. It definitely need to go back to the shop that rebuilt the transmission to find out where that metal is coming from.
Trending Topics
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,730
Likes: 2,658
From: SE Florida
No, it's not a bad idea. I can't tell from here if anyone did a bad job or not.
A tighter converter won't starve anything. A misinstalled shift kit can starve something, but once again, I can't tell if anything was done right or wrong.
A supercharger without the proper trans hardware and tuning will DESTROY a transmission. Getting the tuning right with the supercharger could very well be the cause of your failure.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
Logistics Pro
Joined: Aug 2014
Posts: 3,567
Likes: 852
Here is some info you may find interesting.
I have been tuning my stock 351w and have been having some intermittent hard/soft shifts depending on throttle position and load.
I only tuned fuel, nothing else.
I have put the stock tune back in due to other issues, and trans now shifts more smoothly all the time.
what I believe is going on is as you tune the engine, fuel tables etc. you will also need to tune the transmission tables as well, torque, rpm, 1-2,2-3, etc etc to match the engine power output.
im still learning, and I might be wrong
I have been tuning my stock 351w and have been having some intermittent hard/soft shifts depending on throttle position and load.
I only tuned fuel, nothing else.
I have put the stock tune back in due to other issues, and trans now shifts more smoothly all the time.
what I believe is going on is as you tune the engine, fuel tables etc. you will also need to tune the transmission tables as well, torque, rpm, 1-2,2-3, etc etc to match the engine power output.
im still learning, and I might be wrong
Thread Starter
|
Cross-Country
Joined: Jul 2020
Posts: 56
Likes: 8
You guys are awesome. I believe my tuner could be in a little on the deep side. It's really hard where I'm at to find someone to touch OBD1, so I am grateful. Is there some sort of resource I could point him to even if it's a paid thing? He may not have enough vehicle specific experience to be confident with the transmission portion. I'm not making crazy power by any means. I am putting out a good amount more torque and probably net more HP. I'm running rich with little timing on a little v8. If there was a guy that knew exactly what my transmission wanted tune-wise, I would pay for it and pay my guy to put it on there.
Thread
Thread Starter
Forum
Replies
Last Post
luthoro
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
8
May 30, 2012 07:37 PM
breakfree
Clutch, Transmission, Differential, Axle & Transfer Case
2
Jul 28, 2008 07:56 PM