Cadillac Seville / Cadillac Eldorado Forum Discussion, 1999 STS - Not shifting out of first gear in Past Cadillac Vehicle Discussion; Hello, I have a 1999 STS and about 2 weeks ago I took the car on a trip where I ...
Hello, I have a 1999 STS and about 2 weeks ago I took the car on a trip where I drove about 150 miles and the car ran great. I got to my destination, parked the car for about an hour, then took another short drive and right away I knew the car was not shifting out of first gear. The RPM's would rise but it would not down shift what so ever. I took it in and there were a few codes that came up but they said that the main one was the Mass Air Flow Sensor was bad. So I had them replace this and got the car back and it shifted perfect just like it did the day I took the long drive. Yesterday I drove a short distance to one of my friends houses to hang out for a little bit and the car was still shifting and running fine. After about 4 hours of sitting, I got back in the car to drive home and again the car would not shift and the SES light came on. I have no idea what could be causing this and if it is again the MAF sensor, what could be causing this to go bad so quickly?! Please help!
Well the mechanic said that it is tied in with the computer that tells the car when to shift. Obviously he could be blowing smoke but when they changed it after the first time this happened it shifted again. This is why I assumed it was the same thing. I don't have the codes right now as it is currently -15 degrees here in Wisconsin with a wind chill of -45 so working outside is not an option but I'll see if it warms up tomorrow a bit and get back to you
See and shift solenoid was one of my first guesses but why would the car go from shifting fine, to not shifting, to changing the MAF which for some reason caused it to shift normal again, and finally now not shifting again. If the solenoid burned up initially then it would never go from not shifting back to shifting. Just a thought.
Codes will come tomorrow hopefully depending on weather.