Hi Guys.

This is not a problem but rather I need info of what I need. I've been searching the web for answer but can't really picture what it is all about.

Here's my concern. I've been a V6 driver so I am more accustomed to its inherent behavior. My TLX is 4 cyl.; when I'm on red light there's vibration coming from the engine (?). I suppose this is the nature of 4 cyl? I remember I read somewhere that 4 cyl adds a 'balance' shafts, but but we are in 2015. So did Acura put something in the 4 cyl?

I'm only about 450 miles on the odo, and with my previous Honda product the engine becomes smoother as days goes by. I hope I am correct on this but boy this vibration on idle is really annoying.

Also, I learn how to control the brake and found solution ‘back and forth motion' when braking.

Overall, I really like this car..

 

As far as I know all of the K24s have had a pair of balance shafts. 2.4 is a largish 4 cylinder and there will always be some vibration. From Acuranews
If you want more nitty-gritty tech details:
http://acuranews.com/acura-automobil...tlx-powertrain

 

Interesting, since I find the TLX four cylinder to be very smooth at idle (as smooth as my previous Lexus IS V6).

And I think the "back and forth" motion is for the V6 and 9 speed tranny.

 

the back and forth for me is when I'm braking to a complete stop.

hhmm. this means it's on my specific car. what manufacture date you got? I still think my 9th gen V6 accord and 14 Odyssey are much more smoother on idle and when driving.

 

Most likely not. More likely it is how we interpret "smooth" or "not smooth" on the internet. The V6 in both Accord and Odyssey should be "more smooth" because it's a 6.

All 4 cylinders will have vibrations, smaller engines like 1.5, 1.8 and 2.0 are less noticeable. "Big" 4-cylinders like the Acura 2.4, Mazda or Nissans 2.5 and even Porsche's monster 3.0 need balance shafts to dampen out 2nd order vibrations. How much it dampens, or rather, how much you notice it, is subjective and may vary depending on what you're comparing it to.

 

This is a well-known problem on larger displacement 4-cyl engines. 9th Gen Accord (4 cyl) and the current CR-V (which use essentially the same engine) have some of the same complaints. When in gear at idle and with accessory load (cooling fans, A/C, etc.) it is prone to vibrate a bit at times. Most of the cars, you will feel a light buzz in the steering wheel. Others claim they can feel it in the driver's seat.

Owners of best-selling 2015 Honda CR-V complain of vibration problems | WJLA.com

Devastated over Accord vibration issue - Page 2 - Drive Accord Honda Forums