have a2013 rx350 fwd with about 80000 mi when you let off the gas pedal and accelerate there is slack in the drive line doesnt matter the speed doesnt do it from a stop replaced the torque arm an the cv joints have20000 mi on them no check engine lights any body have any ideas?

 

How do you actually lift off gas pedal and accelerate?

 

You press the Warp Drive button on the console....

 

Need to isolate drive response vs engine response.

Is there a lag when you depress the pedal to engine RPM when in Park? If so the thing you are after is throttle position sensor [fly by wire].

If not:
Is there a clunk/chirp in the drivetrain [all the way to wheel-road contact]. Investigate the source of the noise as that is where you are loosing the precious nano-seconds.

Lastly, what are you comparing the RX to or are your expectations realistic of RX. This is not a sport vehicle. You have a slush box coupling the wheels to the engine.

Salim

 

What's the state of your rear diff fluid? When was the last time that was changed?

 

Highly doubt the rear diff. fluid condition would cause the slack he described.

 

im missing that button on my console. Tried reading my manual multiple times!

 

It is indeed difficult to find unless your nickname is Scotty and you are wearing a red velour shirt....

 

My 2015 RX350 AWD does something like that if I lightly press the gas pedal when accelerating from a stop in traffic. If I press the gas pedal firmly the slack or slip does not happen when accelerating from stop. It only happens if I barely press the gas pedal.

 

I stand corrected. I have just purchased my 2015 RX350 AWD recently and it seems more like a learned shift pattern issue that caused the weird stall/slip at low speeds when lightly pressing the gas pedal. I have put some miles on the RX350 since my last post and the transmission is shifting perfectly even with light throttle input. So again I guess the previous owner must had a heavier gas pedal foot at low speeds than me which confused the transmission shift logic I assume. It usually take a couple hundred miles for a transmission computer to adapt to long term drive style changes.