Low frequency vibration that makes me feel sick!

SuperTrooper

Hi Scotty. Thanks for doing what you do. My family loves your channel.

2001 Lexus RX300 auto AWD with about 200k miles. About 5 months ago it started producing a low frequency vibration at idle that reverberates your ear drums. It’s worse in drive or reverse, but still there in park and neutral. So seems to be worse at lower RPMs. It’s bad enough to shake the dash. I literally haven’t been able to drive it for months because it gives me a headache and makes me dizzy after about 5 minutes.

I’m a decent garage mechanic and replaced spark plugs, an o2 sensor that was giving a code, valve cover gaskets, PCV, and two engine mounts all with OEM parts, and cleaned out the IACV and intake ports. Nothing changed with the vibration. I then thought it was coming from the exhaust, but I had two exhaust shops look at it and they can’t find any issues. Fixed a few small exhaust leaks as well. Currently no codes

What could possibly be causing this vibration at idle? I’m too poor to upgrade the vehicle. I just want to figure out the vibration and fix it. It’s a great vehicle otherwise.

Comments (2)
No. 1-2
Scotty Kilmer
Scotty Kilmer

Editor

seen that before, it's an engine running problem, not mounts or anything else. Try pressure cleaning the fuel injectors and perhaps change the maf sensor if no vacuum leaks are found (that old, intake gaskets can leak a bit and be hard to find.0

Jackofall
Jackofall

That's a tuff one. I would put on lift start and go thru with thestscope, my first guess is the transmission torque converter. Or tranny component.