: high trans line pressure



Guyz1996deville
08-24-05, 02:29 PM
Last night I replaced the motor mount on my 96 deville and the thing still shifts like garbage. I took it to the local cad. dealer and the tech said that the reason for the rough shifting was high pressure in the trans lines. is there any suggestions.

thanks,

eldorado1
08-24-05, 02:33 PM
Possibly loose wiring/ bad connector/corrosion at the transmission, the wiring inside the transmission (specifically to the pressure control solenoid) got disconnected, or a bad pressure control solenoid.

Spyder
08-24-05, 02:56 PM
I don't think high pressure would be a bad thing...maybe it'll make it shift a little harder and quicker...I know that in my old 727 Torquflite, I'm bitter if its under a hundred and forty pounds...

sts96
08-24-05, 10:49 PM
try reseting the trans. adapts in your computer to default so it can relearn. sts96

Guyz1996deville
08-25-05, 12:11 PM
How would I reset the trans

mcowden
08-25-05, 02:58 PM
How would I reset the trans

Try disconnecting the battery for 60 seconds. When you hook it back up, you may see a P0603 error, which means the short term memory was reset. That should eliminate the transmission adapts as well as things like the IAC and TPS learned values. It's a cheap and easy thing to try. The cost is a few minutes time and you'll have to reset your clock and radio presets.

sts96
08-25-05, 04:29 PM
The only way I found to reset the trans, adapts was with a scan tool . A shop that has one can do it in 5 min. or less. sts96

STS 310
08-25-05, 10:19 PM
sts96, havent heard from you in a while...

sts96
08-26-05, 11:24 PM
Been busy driving one N* or another till gas went up. mileage is better on my PC. sts96

Rick94STS
08-29-05, 09:43 AM
I had the same problem on my 94 STS shifting very hard, turned out to be a bad ECM, it was sending bogus signals to the pressure solenoid. Replaced the ECM and the problem was solved.

good luck

Guyz1996deville
09-06-05, 08:22 PM
I had the Trans flashed, and beat on it over the weekend. It shifts great now. I belive that the gears just had to get ran through well. Plus the new motor mount really tightened up things too....