Transmission issues. Torque converter?

[rangerrace]

At first i want to say hello to everyone as a new user :)

I have a 2007 is250, today i noticed there is something wrong with 1st gear.

When i try to move from 0, car have some kind of delay with it, it fell like a transmission is kinda slippery.

I checked it on manual mode, and after changing from 1st to 2nd engine have more rmp on 2nd than on 1st. (Attached video of that)

That's weird because other gears don't have that problem.

Thanks.

 

[Mihanicos]

This is a sign of low oil level and as a result the oil pressure is low, hence the clutches slip.  Check it according to the manual.  All " sealed " for life and maintenance free automatic transmissions need their oil and filter replaced.

For my car if my memory serves me right, the oil must be changed every 62000 miles or 4 years. I am not quite sure of the figures, other learned members with better memory will correct me.

Refer to Lexus tech doc for up to date information.

Chris.

[rangerrace]

Thanks for reply!

The first thing i was guessing was the transmission fluid, but not all the gears should have a "slippery" issue if that would be a fluid?

I made a little research, and some people say that could be a solenoid or ecu issue.

That would be great if topping up a fluid will solve the problem.

[is200 Newbie]

Is the sports mode on - i find gear changes in auto mode a bit jerky at top rev with the sports mode on - much smoother with it off... just a thought ?

[Mihanicos]

In first gear is more evident because more torque is needed to accelerate the car from rest. When higher gears engage,  is not noticeable unless you accelerate hard.

Indeed it could be a solenoid, although I would say a low possibility, but before you dive deeper, always begin with the simple and easy fixes. 

Chris.

[Guest bigbullhead]

On 8/2/2020 at 10:36 AM, rangerrace said:

Thanks for reply!

The first thing i was guessing was the transmission fluid, but not all the gears should have a "slippery" issue if that would be a fluid?

I made a little research, and some people say that could be a solenoid or ecu issue.

That would be great if topping up a fluid will solve the problem.

It will be when cold