@Rain2005Fos welcome to the forum!

How's the ATF look & is it at the correct level? Has The ATF been changed recently? If yes, was the ATF filter replaced?

Bobby..

['07 FSXT Member Journal] ['03 X Member Journal]

 

@2.5x_sleeper Planning to check it today. It's been non-op for a couple years (bad cat) and I'm trying to get it back running now that the cat was replaced. When I noticed the lurch start about 2023 I checked the ATF and it was red and clean, no burn smell and full. As I started to drive it to get smog checked I noticed the lurch was getting worse. Will update once I take a peek. Hope it's that simple.

 

"It's been non-op for a couple years ..."
The transmission valves may be hanging up after sitting without moving.

Do you have manual shifting ability in your car or just "D"?

 

I do have 1-3 below D

 

Ok, left side of transmission, side ways mounted filter. Looks like oil filter. It should say transmission on it. You might be able to snap a picture. If you can, post it here.

 

The reply box doesn't give me an option to insert a photo but it looks like the one in the picture posted by @2.5x_sleeper

 

@Rain2005Fos the external spin on ATF filter is special, considered a non-maintenance... permanent filter, only changed when the transmission is worked on. If an engine oil filter was installed, in time, there will be issues!

The Subaru ATF filter looks like this:

Bobby...

['07 FSXT Member Journal] ['03 X Member Journal]

 

I think it is a minor problem that could improved with a fluid change and continued operation. That’s what I think.

 

So twice now the lurch has been so hard going uphill from a stop that my rear tires screeched. I also noticed my car making a sucking/whirring/squirting sound when I accelerate. I can hear it through the cab vents. Going today to get the codes ready since the engine light is on and cruise control is blinking.

 

That's not what I call a "lurch". That's something more significant. I'm pretty sure it is sticking valves. If you were in gear #1 on this uphill start, would would it still act like that?

When I first got my car, I pulled the pan and cleaned all the gunk out.

The car had a really noisy system, squealing and stuff like that. I was really worried so I went ahead and swapped the transmission out. The one I swapped in made all the same noises and it was a 2009 model. This November will be one year of driving on this transmission with no problems except the noise. I cleaned up the 2010 valve body and intend to put it into this 2009 transmission and see what the results are.

This is a brief advertising video that gives some idea of the things that are going on in the hydraulic system. There other additives that could help but you have to be careful not to get carried away with transmission additives.

 

The external "filter" is NOT a filter. It is a large particle screen. There's a internal filter in the pan. It's not a maintenance item. Use of a aftermarket "filter" leads to many issues with the transmission because it changes the pressure inside the transmission. Automatic transmission DO NOT generate particles that warrant changing this large particle screen.

If this screen is actually clogged, you have way bigger problems. But in general nothing is being burned and there's just nothing being produced that would clog either the internal filter or external screen.

We've seen multiple posts on here where owners think they're being proactive and change this with aftermarket units and cause issues.