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Yes, torque converter could fail locked, but shouldn't "get better" after awhileoff topic a bit, but have you ever heard of a tourque converter not unlocking? A couple of times a few years ago with the HHR (yes, chevrolet retro-car) I would come up to a stop sign, engine usualy cold and it would stall out, like if it was a manual and you didnt push the clutch in. Its not happened for a long time but I always wondered if it was a tourque converter that was locked and not engaging, but it doesnt make sence in a way, the stop sign was within the sight of the house, no way you could get to 30mph, probably was only in 2nd gear at best plus the times it happened engine was cold, I just hopped in fired it up, 3 clicks and out the drive I went. Id think converter wouldnt lock up unless in high gear and not until engine was warmed up fully. This thread had me thinking about that issue. I know now I can watch the tach and once its fully warmed up rpm drops a good 200 or so, sometimes you can feel it, like a extra shift.
I think it is something in my wiring at this point....Correct, a solenoid has no polarity, just needs both 12v and ground on its 2 wires
The TCC solenoid opens a valve that sends pressurized ATF to torque converter to lock it
Could be an issue with valve, passage, torque converter or PSI pressure, the pressure is what holds the "lock" in place