sam12345

iTrader: (1)

Ecu is fine car runs perfect now

Gustufsun

I have a similar problem. 1990 LS400 114k miles. Been draining and replacing tranny fluid roughly every 7k miles (2 quarts, Toyota type IV) So at 114k miles I decided to drop the pan to clean the magnets and replace the strainer. Went fine, no problems, pan magnets were not even especially "dirty". Put on a new gasket, put in roughly 3 qts (after driving a bit to get it warmed up etc.) Measured using dipstick to hot level.

Now, the problem, when put in drive (or reverse), there is a small hesitation before the gear is engaged (with increasing rpm). Other than that car seems to shift fine when driven.

Any ideas? Clogged solenoid?

Yamae

When does your problem happen? Only when cold?

Gustufsun

No, it has happened when warm from a dead stop starting to go up a hill.
Also, before I dropped pan had no transmission issues what so ever.

Yamae

Sounds like the internal pressure is a bit low to me.
I would check the line pressure first but this requires a pressure gauge for the AT with an attachment.
The pressure should be around 0.4MPa selecting D / 0.6MPa selecting R at the idle.
A clogged / incorrect strainer, incorrect ATF, a worn pump or others will cause the low pressure problem.

Gustufsun

Ok, thanks, I'll check that out.