1987 mr2 86,000 wont engage into overdrive unti approximatley 20 minutes of driving in the morning. If it is warm out sometimes sooner. The car comes right up to temp as it should. The issue seems to be more with the temp of transmission than temp of thernost. I have a 1 hour commute. The vehicle runs at 3700 rpms at 60mph until OD kicks in then 2500. In the afternoon when I get off work and jump in the car for a return trip it takes about 5 minutes to engage OD.
It sounds as much like a lack of Torque Converter Clutch as what you call O.D. I know this won't make sense to you but if the brake switch is not working correctly it will drop Lock-up of the converter clutch. In what ever gear you get to lightly step on the brake without letting off the gas & if your in lock-up the clutch should release and your RPM go up. Also in winter you will get a tighter valve body in low temp but the first shift and a few blocks later your okey. The valve body sounds dirty ,if your getting lock-up. I hope you have changed the fluid every couple years since it was new,and used the correct fluid. A fluid change won't fix this issue and never use any additives. Also check to see if you have a lock-up solenoid external or speed sensor. They will have to be tested by a professional diagnostic tool.
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Don't listen to that guy, he doesn't know what he's talking about!! I have an 85 Celica with the very same issue. I was told it could be some kind of temperature sensor that may not be working properly. There is a sensor, I was told in the exhaust line that indicates that the car has reached operating temperature and until that sensor is tripped, it will not activate the solenoid that allows overdrive to engage, it could also be that solenoid malfunctioning, or maybe a fuse or the switch that turns on the overdrive malfunctioning.. I would check those things first before you go thinking the trans is having issues.
Calvin...... You need to treat your Jeep to a new THERMOSTAT. The Overdrive is connected to the engine coolant temperature and if the engine is n ot warmed up properly, the Overdrive will not engage. Try to get a thermostat from the Jeep dealer so you will have exactly the right one, some of the cheapoie ones will not work right. Dave in Iowa
The ETC switch is a transmission control device. When it is not active, the transmissions shifts normally. When the ETC is engaged, it alters the shift points.
Example: the 1-2 upshift occurs normally between 18-20 mph. Now, say you are towing something, or are carrying a heavy load...engage the ETC, and the trans computer will "hold" the 1-2 upshift until 22-24 mph. It is just for that, prolonging the shift points, due to load.
The switch on the side of the shifter is for the Overdrive. Engaged (the OD light is off) the transmission shifts into overdrive. This saves you gas. When the button is dis-engaged (the OD OFF light is on) , the transmission does NOT shift into overdrive. It is best to leave the overdrive ON, and the ECT OFF to obtain maximum fuel mileage. I hope this has answered your question. Please feel free to comment back if you have any other questions. Thanks for chosing FixYa for assistance.
in the morning, the transmission will not shift into overdrive for a few miles. This is not a problem. It's designed to do this, allowing the transmission temperature to be warm to prevent damage. good luck happy holiday
It is not suggested strip and twist wires. Better take it to an authorized service station to check what causes the problem.Is it OVERDRIVE SWITCH or CRUISE CONTROL MODULE faulty?
Over drive switch has three points. (5 to 4 selects "ON" or 5 to 6 selects "OFF").
Right click on following schematic, "save picture as" to a location in your PC so you have a ZOOM IN view.