1995 buick century v6,102,000 miles. when at operation temp, transmission comes out of overdrive, can be riding down road, shift into neutral switch car off and coast for a few seconds, crank car shift into drive and will go into overdrive for a few seconds then go out again. I was wondering if it is the speed sensor or a sticking valve in transmission
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Overdrive has two important factors involving when and if it turns on besides being in the proper gear shift position. One is tthe car has to FIRST reach operating temps before it will engage the TCC ( torque converter clutch ). That could involve a faulty thermostat, or short distance drives, Second important factor WILL DISENGAGE WHEN STEPPING ON THE BRAKE PEDAL. A brake switch could be misadjusted , and without you stepping on the brake, the computer thinks you are and wont engage TCC. Hope this helps.
The engine temp has nothing to do with overdrive, transmission temp may, but either way if you are just coasting it should go in, or maintaining a speed of at least 44mph it should go in. How many miles on your car? It could be a sign of worse to come, usually the highest gears go first.... 3rd or 4th gear could be next.