I just bought this 1992 Honda Accord. The catalytic converter is missing so it runs really loud getting that replaced now. Well I drove it four hours without any issues obviously I didn’t drive as fast because of the missing converter, but I’ve noticed that the transmission in the RPMs like to go up really high while I’m accelerating, like when i go to 60mph it jumps rpm’s and seems like its slipping. The D4 light blinks. When i tried jumping the tcm it wouldn’t show me any codes except one blink. It almost seems like the transmission is slipping. All the parts are original. I was gonna swap out the TCM and the solenoids to see if that fixes the problem, any idea what else it could be? I own an acura legend and it doesn’t have any of these problems.

 

Did you check the fluid?

 

yes the fluid is good.

 

If the D4 light is blinking you have stored/active TCU codes. Pull the codes and it may point you in a direction. It sounds to me like the transmission may have internal damage though.