I have a 93 lumina with a 3.1 engine and a 3speed automatic transmission w/lock up torque converter. The car has 130,000 on it. When the car is good and warmed up, the trans does not seem to downshift properly. It seems to stay in the lock-up position, and sometimes will stall out. I can correct this by turning the car off for about a half hour, then restarting it. This problem with the downshifting only occurs when the trans is warmed up. Otherwise, this car runs like new and I would like to keep it. Please respond when you can. Thank you. Peter Marshall
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the torque converter is locked in over drive mode either the torque converter is bad or solenoid on trans valve body is faulty but there is a plug on driver side of trans usually its white on gm if you un plug it your stalling problem will go away but so will over drive just uses more gas when speed above 45 isn achieved
SOUND LIKE FAULTY TRANSMISSION TORQUE CONVERTER CLUTCH SOLENOID.WHAT HAPPENING WHEN YOU COME TO A STOP.WHEN YOUR FOOT PRESS THE BRAKE PEDAL THE TRANSMISSION TORQUE CLUTCH SOLENOID SUPPOSE TO UNLOCK TORQUE CONVERTER TO KEEP FROM STALLING THE ENGINE IF NOT THATS WHAT CAUSING THE ENGINE TO STALL OUT.SO HAVE THE BRAKE LIGHT SWITCH CHECK OUT AND HAVE THE TRANSMISSION SCANNED FOR A TRANSMISSION TORQUE CONVERTER CLUTCH SOLENOID FAULT.
Got a service engine soon light illuminated on the instrument panel? If so, look for codes related to the torque converter clutch. Sounds like a bad TCC Solenoid or problem within that circuit. If the torque converter clutch does not release in lower gear ranges then it's just like letting the clutch pedal out on a manual transmission - there is a direct lock-up between the transmission and engine and thus the engine dies.
I believe your torque converter is going out. See with an automatic transmission, a torque converter does what a clutch does in a manuel transmission. It allows the engine to continue to run when the car is at a stop by diconnecting the engine from the transmission. It sounds as though your torque converter is not functioning properly and it is causing your car to stall out. Hope this helps, and let me know how it works out for you!