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well i know the lockup only engages after you are going a certain speed, usually above 35 miles an hour. as for springs in the tranny, there is an adjustment for the front band and the low/reverse band. the spring tension could be on the accumulator which is usally altered by using another higher rate spring either under the old one or totally replacing it. the non-lockup condition could also be do to electrical problems as the lock-up (oneway clutch) my not be energizing....im doing all this from memory now so you might not even have electric engagment on this trans...if its electric i know theres an electronic control solenoid located on the valve body inside the transmission, this engages and disengages the clutch. theres an old school engine computer that tells the converter clutch when to engage based on info from the coolant tempurater sensor, vacuum transducer, vehicle speed sensor, and carburator or throttle ground switch.
1st. old school is to apply the clutch with hydraulic pressure. this only works in 3rd gear and at a preset speed. now dont quote me on this but you may need to increase the spring tension on the accumulator if this is the problem. otherwise check your tranny fluid level, you may be low or have some kind of pressure loss in the trans.
2nd. if you've got electonic controls on the tranny, hydraulic lockup controls are still preset in the PCM. so check number one first, but in this case the solenoid-operated hydraulic valve is computer controlled.
if you're running on the electric system the first thing that happens is the PCM checks the engines tempurature, it's got to be above 150 degrees or the solenoid will never engage.
next, if the temp is above 150, the PCM looks at vehicle speed. theres a sensor on the speedo cable that tells the PCM if the car is going above or below 40mph. theres a preset engagemnt speed and if it's met the PCM next checks throttle position. if the PCM thinks the throttle is closed and the car is cruising the clutch wont engage.
the last factor is vacuum. a vacuum transducer measure vacuum and PCM determines engine load. the clutch will only engage during no-load or low-load conditions. vacuum has to be above 4 inches Hg and below 22 inches Hg.
If everything is tooty-fruity the clutch engages, otherwise nada.
all the solenoid does is move a check ball into position to prevent the valve from bleeding off line pressure. this buildup of pressure defeats spring tension, and fills the converter with fluid the clutch piston fills and the clutch is applied.
thats all i can remember right now. any questions? If I were a machine, I'd be a lot happier.
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