On my 2007 Legacy....  When I take off from a stop shifting from 1st to 2nd, and 2nd to 3rd, I have a surging symptom.  At first I thought maybe I had a vacuum leak somewhere, but don't know if vacuum plays a part in this transmission.  There is a fuse for the transmission control unit, so I figured maybe this control unit is something that could be failing, and something that can be replaced easily???  Not sure...  Any ideas?????

any work done to the car before this began? new tires or fluid changes?

 

How old is the trans fluid? Have you checked the fluid level?

No work done prior. Trans fluid has about 90K miles on it. Realizing that it needs to be serviced, I can't imagine that is the whole problem. CV boots are leaking a little, but keeping fluid level up until I can afford that project.

no direct vacuum control of the trans - it's electronic.

 

I'd try doing 3 drain/fill/drive briefly/repeat cycles to get mostly fresh fluid in there(only about 40% will drain from the trans plug, the rest is in the torque converter) - maybe try a CRC Trans-X treatment on the last fill. It has helped a lot of older transmissions last years longer than they would otherwise. Yours just seems to have problems earlier that it should.

 

Do you have any warning lights on/flashing?

Edited September 25, 201411 yr by 1 Lucky Texan