Oldsmobile/Buick Repair: Torque converter wont lock up when at running temp., tcc solenoid, olds aurora

Question
Recently purchased a '96 Olds Aurora. Shortly after the car warms up to operating temp., the torque convertor will not lock up. It locks up perfectly shortly after the tranny hits the required temp. I've measured the voltage on the the grounding side of the TCC solenoid @ the PCM. It shows system voltage when it stops engaging. I have manually grounded this wire while driving above 65 kph (~ 38 mph) & the solenoid shifts perfectly. A little harsh as I cannot duplicate the PWM signal. The only code I get on my scantool is misfire in cyl. #1. Note, I have a low end scanner (Actron) & it does not show the tranny temp either. I have never been able to sense or feel any misfire as the car's engine runs perfect. I've read over the GM service manual & cannot figure out what to try. Would a single misfire detected by the PCM not allow the convertor to lock up? What else would cause the PCM not to actuate this solenoid? Any help would be appreciated. Thanks for your time.

Answer
hi mike.wow i am impressed,at such a theral job of diag.well a misfire code would certainly be a possibility as in false info being sent to the processor.but i really don,t see why it would only effect the tcc.why not try and adjust the throttlevalve cable which in essence will change the shift pattern slightly.because trans temp is not the only factor in the tcc working properly tps also plays a small part.so if this cable is off a little the processor would not let it lock up.the other possibility is a bad ground.or computer.but if you manually ground it and it shifts what happens if you leave it manually grounded will it release or stay locked?/that is about all i can say .you almost went out of my ability on this one lol good luck and please rate my help ty billymac