UpSideDown

That seems to be a reasonable explanation of this behavior. And yes this happens in 5th and even 4th gear as well. However, this seems only happen when it is cold out side and the engine is cold. When the engine temp reaches the optimal temperature all goes back to normal, the transmission/engine stops doing this. The car is from 2012, I think it starts doing this for a year ago or so. Is this a sign that something needs to be replaced down the road? Or should I take easy on this? I'm planning to keep the car few more years.

I'm having this annoying problem with my IS250 from 2012. When I'm cruising on highway gentely accelerate and lift the foot off the gas pedal, the engine rev dips briefly and comes back. It feels like a very brief engine brake. This seems happens only before the engine is fully warmed up and in any gear. Anyone know why it does this? :uh:Here is a recording of this strange behaviourhttps://youtu.be/aJCsd3QMMuY

Yeah, thats cam gear rattles. But that only happens on start up of the car.

The car seems perform normal. Rpm is steady and exhaust is normal too. It's just the injector sound come and goes. And this happens when idle rpm settles after a cold start and when the car is stationary.

Well it's not the *tick tick* noise that's bother me, I'm used to it (it's not loud when the bonnet is closed). If you listen carefully you can hear the tick tick noise interrupts and then continues. It has never sound like this before. It's very noticeable when you stand close to the car. Don't know if I should be worried.

Hey guys, see attached recorded video. anyone know why the injectors sound like this? The ticking noise interrupts here and there. It starts sound like this passed few days. The car run normal. Should I worry about it? The car is a 2012 IS250 fsport. My dealer replaced knocking cam gears a year ago.

There are videos on youtube show how IS250 2nd gen reach 250km/h or more. Like this:

The IS250 is definitely more fun compares to 300h. The 300h is really boring to drive. The CVT kills it. You step the gas pedal to the metal (in sport mode) and nothing happens in the first second or two. Also the sounds. It will sounds like a motor boat when you accelerate and an old tram when you decelerate. Meh...

I had a loaner 300h while my 250 F-sport was in for service. a brand new car and it has this rattle you described, plus a terrible rattle from the center console. sounds like 2 metal sheets vibrate against each other. I have to say that the interior build quality is pretty bad compares to 2nd gen IS. The whole center console looks ok, but feels realy cheap and low quality. So does the doors, seats, steering wheel and the boot. Glad that I didn't swap to 3rd gen IS.

So you accepted the result?? My dealer reprinted my rear bumper 4 times (they had to order a new bumper after the 3rd time) to get the color spot on, without blend in to other panels ( I have 3 stage white pearl paint). You should let them repaint until you are satisfied with the result. OP's car is black, it should be pretty easy for them to get a good result.

So, where is the youtube video?

You just deleted a feature of the car. :)

It must be that if they offer all options on Fsport, it will affect the sale on the regular luxury version. I personally think the options they miss out on Fsport is not a big deal. The car is pretty well equipped anyway. Here in Europe, the most sales of IS will be middle equipped regular version of 300h, as company fleet cars. So they can offer all options on Fsport for private buyers. It won't fit in to the company car price range anyway. :) That's just want I think. :)

I know, its a shame that we don't get 350 in Europe. We don't even get the AWD model. I even think the Fsport package suits better on a 250 than 300h. Too bad the 250 doesn't receive the new 8 speed gearbox and the active suspension that 350 Fsport has. Strange decisions from Lexus, I must say.

I think the Fsport suits better on 350 with the new 8 speed gearbox active suspension. It just doesn't do it on a 300h.