WHEN IS COLD DO NOT SHIFT TO OVERDRIVE .WHY?
HONDA CIVIC D15B 1993 JDM AUTOMATIC
First check the transmission fluid and see where the level is at. Then check the transmission temperature sensor, valve body and solenoids and see if one of them needs to be replaced.
One more thing: DON'T SCREAM AT US IN ALL CAPS.
Thank you for your answer. I am sorry for screaming at you. I did not know that capital letter means that. I just forgot the caps lock.
Transmission fluid is ok. The transmission temperature sensor I can not find, solenoids as I understand are ok and valve body I can not find.
solenoids as I understand are ok and valve body I can not find.
These are inside your transmission, above the transmission pan. I wouldn't go poking around in there if you're not somewhat aware of what you're doing.
Some transmissions hold a lower gear until the engine is sufficiently warm to enter overdrive. It's an emissions control thing. Cold engines create more emissions than warm engines. For example, my '99 Ranger will shift into overdrive, but it will not engage the torque converter lock-up until I've driven a few miles.
Yes, I understood that. As the fastest I-am-going engine gets cooler and it is not shifted to overdrive. As soon I get up to the hill engine gets warmer and shift to overdrive. Opposite of how should be. I have a new thermostat
DO NOT SHIFT TO OVERDRIVE
You are probably feeling the torque converter clutch, not overdrive gear, which is normal transmission behaviour when cold. They are easily confused.
the fastest I-am-going engine gets cooler and it is not shifted to overdrive. As soon I get up to the hill engine gets warmer and shift to overdrive.
Up to the hill, or up the hill? You probably won't be able to climb a hill in overdrive with a cold engine. Sounds like normal behavior to me.