Need advice with AX4S transmission
Hi All, we have a 2001 Taurus LX (3.0, OHV, AX4S) with over 180,000 miles. Recently, my daughter was driving on the freeway at 65 mph for about 15 minutes & the car ran great. She got off the freeway to drive a few miles on city streets. After a couple miles in stop and go traffic, the transaxle light came on. A short time later she noticed the RPM started jumping up like she was revving the engine, even though she was only going between 20 to 40 miles per hour. When she took her foot off the gas, the RPM jumping stopped & the car went back to regular idle. After just a few minutes of this my daughter noticed that the car was not shifting properly, up or down. (From what she described, it sounded like the trouble was shifting from 2nd gear to 3rd & from 3rd gear to 2nd.). I posted this trouble earlier on this forum on another thread and was advised to check the fluid & change if old & burnt, and also to pull the engine codes. We changed the filter & dumped the pan fluid (it was old/dark) and put in about 6 ½-7 quarts of fluid. I then drove the car for about ½ hour on the freeway & never had any trouble. My daughter, and then my wife, each drove the car for about 15-20 minutes and they got the transaxle light flashing again along with the RPM jumping up. My daughter had the shifting trouble again as well. *Important to note: through all of this trouble with the flashing transaxle light on the dash, the RPM jumping, and trouble shifting, the check engine light has never come on. However I hooked up my little code reader but it didn’t show any trouble codes at all. I borrowed my brother’s code reader, which is a little better unit than mine, but it didn’t show any trouble codes either. All I can imagine is that our code readers do not have the ability to read transmission codes. Does anyone know if transmission trouble codes will cause the ‘check-engine’ light to come on? If not, how do you know to look for them? Do I need a special code reader for transmission codes? Anyway, I could sure use some help and advice on what it is, and if I am looking at something simple or a whole new transmission (remanufactured/rebuilt). Would a valve body change fix this, or a new torque converter? Thank you all for the help given in the past, and thanks in advance for the advice to come.