In a 1989 Ford Tempo, the transmission may not upshift automatically due to several potential issues, such as a malfunctioning throttle position sensor, low Transmission Fluid levels, or a faulty transmission control module. Other possible causes include a defective governor or issues with the vacuum modulator (if equipped), which can prevent proper shifting. Additionally, worn or damaged internal components within the transmission itself could also impede automatic upshifting. Regular maintenance and timely diagnostics are essential to identify and resolve these issues.
IN the transmission.
Check that the TV rod is adjusted properly or is still attached. it is an adjustable rod that connects from the transmission to the throttle linkage and the adjustment controls the shift points and kick down function of the transmission.
Have to remove the transmission.
Try the Library.
The same problem that plauges most older Fords. There s a shift advance lever of of the throtle that connect to the transmision. Eith it is stuck or it poped off. Put back on and push it forward on the transmission
Mercon
Between the engine and the transmission.
If you're asking why the gearshift won't release once you start the engine, it's probably a problem in the keyswitch mechanism that releases the gearshift. If you're asking why the transmission won't shift into gear after you start the engine and put it in gear, it could just be low on transmission fluid or have a blocked filter, but most likely the transmission has failed and you'll need to take it to a shop. Check the transmission fluid, if the level is up, smell the fluid, if it smells burnt you have overheated a clutch. Sometimes that just happens when a transmission gets worn out.
most cars you have to add the transmission fluid through the dipstick hole leading into the transmission its self
Bad seal? Leaking cooler line?
Meron, ONLY!
dexroniii/mercon