420A 95 talon esi auto stuck in limp mode

[jesse12345]

Hey all back again except with an unusual issue. I recently got my engine up and running in my talon, she's been sitting for 12 years. The car only has 79k miles, and I replaced literally everything you can on the engine and transmission. I even went through the valve body. If I leave the battery disconnected and then connect it the car will start out in 1st gear and shifts real ugly into 2nd and then it's in limp mode. It did all of this even before I swapped all sensors and solenoids so I'm at a loss. I really don't want to rebuild, and I can't seem to find anything to my issue. Thanks all for any help and im not ready to swap to manual quite yet.

 

[jesse12345]

obviously I don't read directions very well, on my application there's a plate that has to come off for the new solenoid pack to work. I was stumped for awhile and I assume 98 percent of you don't mess with the 41te auto and I don't blame you. The thing goes into limp mode if you look at it wrong.

 

[1995TalonMT]

I also replaced the solenoid pack a few years ago along with the input and output sensors on the Transmission. Hopefully you fixed the problem and it is shifting correctly now.

 

[1990TSIAWDTALON]

A bad VSS or pulse generators will throw it into limp mode so if the speedometer is not working right or one or both pulse generators on the trans are not working, it will stay in limp.
Just some info.

 

[jesse12345]

Yeah I replaced both of those sensors right away because when I first took it out the speedometer wasn't working. I won't be able to test until I get it up on Jack stands but crossing my fingers that's all it was. I'll let you guys know otherwise I'll probably need a transmission unfortunately. Thanks for the replies.

 

[jesse12345]

Just tested it out seems to be shifting fine let's hope it holds up now.

 

[1999RSfwd]

I have the same issue with my 420a auto, but only when the trans warms up. I replaced both sensors, the solenoid pack (removed the spacer), and the filter. At first I thought it was fixed, but the shifting was weird. I just figured it was relearning, but then it kept getting stuck in limp mode again. I even replaced my tcu and it does the same thing. Every time I come to stop sign or a red light or have to slow way down, I put it in neutral come to a stop and then put it back in drive. This seems to trick the tcu into letting trans shift properly, and not get stuck in limp mode.

I'm ready to manual swap the car, but my focus now is my GSX, so my RS is on the backburner.

 

[jesse12345]

I guess the 41te valve body gets super sludged up, when I contacted a transmission shop about my issue that was one of the big ones. I bought a transgo shift kit for it and super cleaned the whole valve body seems to shift very nice too. I also put a big transmission cooler on it and I have a trans temp gauge. I'm no expert in the transmission department but the valve body was very easy to tear down. Hopefully I was of some help.

 

[1999RSfwd]

I'll look into cleaning the valve body before I manual swap it.
I've been wanting wanting to add a bigger trans cooler as well. I'm sure that excuse for one built into to radiator doesn't do a whole lot.

 

[jesse12345]

Yeah man I want to manual swap but where I'm at right now I have to deal with my auto. All the research I've done on these autos makes me feel like mine isn't going to last very long with the setup i have, but who knows maybe the shift kit and cooler will prolong its life.

 

[1999RSfwd]

I'm sure the cooler will help. I had a trans leak several years ago that I just ignored. I think running it low on fluid is what damaged mine, but I'm not sure. I'll definitely look into cleaning the valve body, and adding a cooler.