-Do you know if it's a lease return vehicle? I had experience driving lease returned vehicle with similar issue, I thought the car was probably abused as I can feel the car is not as strong.
When I go in for service, the dealer provided me a newer model of RX, and the loaner vehicle is a bit louder and the acceleration is much much slower.
-Have you done a oil change since you gotten the car? that's worth trying it.
-Last, I would suggest to take the car to a local trusted/recommended import shop and get their opinion.

Thanks
Steven

 

Hey everyone,

Just to answer some questions. I've had the car for over a year now. I've noticed it shortly after I bought it. I've done all scheduled maintenance to it and tried using 91 octane gas.

This weekend I took it to another dealership. Told them that their rival wouldn't diagnose it and hope that would get their attention. They said they didn't feel a vibration that would out of the ordinary. They did change out my battery under warranty so that's cool. My warranty just passed. I brought it into the dealership as a second opinion thing but no dice. I do have it on record with two lexus dealership so if some problem does arise I can contact Lexus and hope they work with me.

Kind of crazy to me since this is easily the roughest car I've ever owned. If this was "ordinary" for a Lexus, then every car mag would be writing about it. Especially since people buy Lexus pretty much for refinement, comfort and smoothness. I'm not saying my teeth are chattering, but its noticeable. My wife's Mazda CX-9 doesn't vibrate like this and refinement is fairly low on the priority list for Mazda.

Next step would be independent shop and get their opinion and then back to Lexus and hope the I told you so works.

Anyways, thanks for the help everyone.

 

try having the throttle body cleaned, then use a good fuel injection cleaner such as chevron techron or bg 44k. is it any better on the 91 octane?