93 Honda Civic Sedan not shifting into overdrive

In 1980, Honda Civic is available in two engine. One is 1335 cc (1300) CVCC engine made 55 hp while the other is 1488 cc (1500) CVCC engine produced 67 hp (50 kW). Honda civic offers 4-speed manual and 3-speed automatic transmission. These both engines of Honda Civic available in base and DX versions.
If your interested to know more about the Honda Civic 2017.

if its not shifting make sure fluids are full (I'm sure you did) im just saying is your speed sensor on trany pluged in , and your throttle return cable from trany to fuel return hooked up

with that milage go with the rebuild dont waste time and money faffing around

is the speedo connected ??

first thing to do is check the transmission fluid level should be a dipstick at the front or back of trans

its most likely the distribuator igniter

THE MOST COMMON PROBLEM BY FAR IS THE IGNITION CONTROL MODULE.

That should be the L60-4 truck version
Have the sedan version, 93 Caprice.
That was the first year of the new electronic shifting transmission.
Especialy when cold she will shift hard, but it's normal.
But that depends on what you call normal.
I have gotten used to it over the last 17 years.

Check for split hose's around the inlet manifold.Sounds like a vacuum leak.
Hope this helps.

I had the same problem, picked up a new computer for the tranny, I think it's under the seat, works fine.