93 atx 1st gear hesitation

[angstrom89]

When you start the car cold it shifts fine. Once the tranny warms up you come to a complete stop and it acts like it’s in neutral. Rev it slightly once or twice shifts into first drives fine, till next stop. I thought it could be a clogged filter or low on fluid. So I just changed the filter refilled still doing it. Check codes I only got 332 for improper egr flow. Any advice would be appreciated. I also tried manually shifting does the same thing.

 

[zoomlater]

How many miles are on your tranny? Does it slam into gear when it engages after it warms up. Prior to my second tranny rebuild, it did something similar to what you are describing, but my car would slam into first due to the higher revs from a stop.

 

[luigisho]

I assume that the engine itself is running normally. The atx is not a robust transmission but maybe the clog or pressure issue could also be the solenoid. Something to consider.

https://www.mistertransmission.com/transmission-solenoid/

 

[sperold]

There should be codes in your system for your transmission problem. What method are you using to check your codes.

The only experience I have with an ATX car is my 93 was a convert from ATX to MTX, and it was done the hard way by using the all the electronics from the ATX car. If I read the codes on my car, there is a huge list of faults which boil down to "I can not find my missing automatic". Things like the input shaft speeds do not match output shaft speeds for all the gears, so there are lots of codes built into the system to give you information.

As a total long shot - I would bypass the radiator "cooler" and install an external cooler that sits in the air
stream in front of your rad (but not touching as they recommend). Consider upping the line size of the cooler (perhaps with flex tubing) if you get some results from cooling your transmission better.

It is a long shot, but I bet it helps the situation and the coolers are very inexpensive.

If your car behaves better in cold weather, that is a clue to the issue.
Hook up your radiator "cooler" in the deep cold weather.

 

[NoSlo]

Your problem is right here:




The first possible concern, if you have no engagement at all, no reverse even, is the pump shaft splines, which can strip out inside the torque converter. You get no fluid pressure when it just spins. In a continuing no-engagement situation, disconnecting one of the transmission cooler hoses up front will show little pumping instead of pumping out a gallon a minute.

If you are driving the car, and after it commands a 2-1 downshift when you come to a near stop you have no engagement, and neutral-1 also gets you nothing, it's possible that you have clutch bands on the way out for first gear. Otherwise, a slight chance that one of the accumulators which command the transmission has a fault such as broken spring or are sticking (electrical problems should be indicated with codes).

If you're lucky, it's something like the transmission range sensor, (mounted in the tranny instead of on the gear shifter, and run by a cable), which can be electrically tested. More intrusive but still a tranny pull is the SS1 solenoid, or the 1-2 shift valves.

Factory shop manual pinpoint diagnostic procedures should be completely exhausted before pulling the tranny. Unfortunately, roll this into 99% of tranny shops, you'll get a rebuilt transmission bill.

Watch this beast tear down an AXODE in 12 minutes, broken clutch plate discovered at the 4 minute mark.

 

[angstrom89]

To go off all comments made so far.
it will go into first if you just punch the pedal, if I want it to slam in.I just slightly rev it till it goes in.

I do have a tranny line gauge that I use for tv pressure on aod’s. I could run to really tell what it’s doing.
I will state if you shift into second manually then first while moving it will go right in. But if you go to neutral then drive once fully stopped it will still the same. Same as manually shift into first once fully stopped. Still goes into reverse fine. But once in park can go back to drive it will take right off. It’s strange to have no codes thought it could be a speed sensor.