Originally Posted by A440

At what mileage does this typically begin to occur? My 2016 is just over 30,000 miles.

Originally Posted by torque81

Created a new thread for the issue since I think this may be unrelated to battery replacement as I may not have noticed it earlier. The car in question is a 2016 Lexus RX350 F Sport which I bought used with around 42k miles on the clock. The issue is that sometimes when I am simply standing at the traffic the light with transmission in D, the idle rpm is not constant and it keeps jumping by about 150 rpm or so. Even otherwise the rpm needle is never rock stable as it should be but it could be due to the fact that the rpm instrumentation is fully digital in F Sport and there are 20 notches for every 1000 rpm with each notch corresponding to about 50 rpm and therefore even slight variations will be caught. The question I want to ask my fellow Lexus mates is
1. Is your RX350 idle rock steady? Meaning when the engine is fully warmed up, can you see the rpm needle jump a little however slight (you may really have to look for it).
2. The issue with my car is idle jumping by about 150 rpm standing still and doing nothing. It was reported when my Lexus went in for service for other smaller issues (thread link: https://www.clublexus.com/forums/rx-...placement.html) and while I was able to recreate it whenever I wanted to (gentle stop to complete halt and the rpm needle will fluctuate), I can no longer recreate it. It now happens when it happens. Also attaching the video of the same happening on two separate occasions. I am using premium 98 octane gas. What do you think could be the issue here?
https://photos.app.goo.gl/igQFXMF3yzzUUygXA
https://photos.app.goo.gl/JrHDDvtwmcCTRZBY8
3. What is the technical spec for the idle rpm for this engine if you know? I tried searching but could not find anything. Usually it is specified as xxx +-xx rpm

Thanks a bunch in advance and a very happy new year!