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I have a 1990 corsica with the same problem. After the engine was warm the tork lock would not disingage. I disconected the tcc valve. This caused bad gas mileage. I hooked it back up to see if I could find the real problem. What I discovered was the tcc was working under excelleration, but not under decelleration. This fact led me to beleave that to disingage the tork lock you need good trans fluid preshure. I did an experiment, I got on the interstate drove until I was shure it would malfuction when I slowed down. When I got off I55 I realised the tork lock was still engaged and I was in first gear. I then shifted to nutral, and excelerated the engine to above 3000 RPM. I then shifted to drive, and the tork lock was disingaged. Fluid preshure is the key. I installed a trans cooler broblem solved!!!

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Q: Where is the TCC valve located in a 1991 Chevy Corsica and will the transmission be damaged if I unplug it?
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